402 lines
13 KiB
Markdown
402 lines
13 KiB
Markdown
<header><h1>
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Lab databases
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</h1></header>
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----------
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# Create & populate tables
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# Queries
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### Query 1
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The description of all Function
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```sql
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SELECT `description` FROM `Function`
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```
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> [!NOTE|label:Result]
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>
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> "description" <br>
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> "Fast backwards" <br>
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> "Raise up the low frequencies. Cut off frequency : 200 Hz" <br>
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> "Reduce the low frequencies. Cut off frequency : 200 Hz" <br>
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> "Fast forwards" <br>
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> "Tunes down" <br>
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> "Tunes up" <br>
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> "Plays to the next track" <br>
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> "Open or close the player's tray" <br>
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> "Pauses the current track" <br>
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> "Plays the selected track" <br>
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> "Select the preset 1" <br>
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> "Select the preset 2" <br>
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> "Select the preset 3" <br>
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> "Plays to the previous track" <br>
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> "Stores the current frequency to a preset" <br>
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> "Stops the current track" <br>
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> "Reduce the high frequencies.Cut off frequency : 4000 Hz" <br>
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> "Raise up the high frequencies. Cut off frequency : 4000 Hz" <br>
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> "Slow down fine tuning" <br>
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> "Slow up fine tuning" <br>
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> "Raise up the volume" <br>
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> "Reduce the volume" <br>
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> "Select the source of the input (BD, DVD, HDMI, ...)" <br>
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> "Select the Audio format to use with the current source (2ch stereo, 5.1, 7.2, 9.2, ...)" <br>
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----------
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### Query 2
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The `name` of manufacturers that have at least one entry in the `Model` table
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```sql
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SELECT `Manufacturer`.`manufacturerName`
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FROM `Manufacturer`
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WHERE EXISTS( SELECT *
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FROM `Model`
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WHERE `Model`.`manufacturerID`=`Manufacturer`.`manufacturerID`)
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```
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> [!NOTE|label:Result]
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>
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> "manufacturerName" <br>
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> "HEVs" <br>
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> "Sony" <br>
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> "Onkyo"
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----------
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### Query 3
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The `modelName` of device models together with the `manufacturerName` of their manufacturers
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```sql
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SELECT `Model`.`modelName`, `Manufacturer`.`manufacturerName`
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FROM `Model`, `Manufacturer`
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WHERE `Model`.`manufacturerID` = `Manufacturer`.`manufacturerID`
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```
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> [!NOTE|label:Result]
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>
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> "modelName","manufacturerName" <br>
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> "MHC-900","Sony" <br>
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> "SDi-Ampli-01","HEVs"
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> "SDi-CdDvd-01","HEVs" <br>
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> "SDi-Tuner-01","HEVs" <br>
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> "UBP-X800M2","Sony" <br>
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> "TX-RZ70","Onkyo"
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----------
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### Query 4
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The description of the Function with functionLabel “Stop”
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```sql
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SELECT `Function`.`description`
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FROM `Function`
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WHERE `Function`.`functionLabel` like 'Stop'
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```
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> [!NOTE|label:Result]
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> "description" <br>
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> "Stops the current track"
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----------
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### Query 5
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The `functionLabel` for `Function` with `functionID` > 10 and with a `description` containing the word “`preset`” (SQL wildcard character is “`%`”)
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```sql
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SELECT `Function`.`functionLabel`
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FROM `Function`
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WHERE `Function`.`functionID` > '10' AND `Function`.`description` like '%preset%'
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```
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> [!NOTE|label:Result]
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> "functionLabel" <br>
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> "Preset 1" <br>
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> "Preset 2" <br>
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> "Preset 3" <br>
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> "Save preset"
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----------
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### Query 6
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The product of the tables `Code` and `FunctionList` (with and without the `JOIN` keyword), as well as the number of entries in the resulting product table
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<b><u>With JOIN keyword</u></b><br>
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26 elements in 0,0003 seconds
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```sql
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SELECT `Code`.`codeValue`, `FunctionList`.`modelID`, `FunctionList`.`functionID`
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FROM `Code`
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JOIN `FunctionList`
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ON `Code`.`codeID` = `FunctionList`.`codeID`;
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```
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> [!NOTE|label:Result]
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> "codeValue","modelID","functionID" <br>
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> "7","1","1" <br>
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> "124","1","10" <br>
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> "125","1","16" <br>
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> "547","1","9" <br>
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> "698","1","4" <br>
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> "59409854","3","8" <br>
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> "78546723","3","7" <br>
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> "81298355","3","16" <br>
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> "84578346","3","9" <br>
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> "84793478","3","10" <br>
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> "95847623","3","14" <br>
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> "458945040","2","17" <br>
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> "458945041","2","18" <br>
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> "458945042","2","2" <br>
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> "458945043","2","3" <br>
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> "458945044","2","21" <br>
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> "458945045","2","22" <br>
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> "1164736495","4","19" <br>
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> "1164736496","4","20" <br>
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> "1184894580","4","11" <br>
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> "1184894581","4","12" <br>
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> "1184894582","4","13" <br>
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> "1184894589","4","15" <br>
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> "1948573644","4","5" <br>
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> "1948573645","4","6" <br>
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> "1948573646","1","8"
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<b><u>Without JOIN keyword</u></b><br>
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26 elements in 0,0002 seconds
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```sql
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SELECT `Code`.`codeValue`, `FunctionList`.`modelID`, `FunctionList`.`functionID`
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FROM `Code`, `FunctionList`
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WHERE `Code`.`codeID` = `FunctionList`.`codeID`;
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```
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> [!NOTE|label:Result]
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> "codeValue","modelID","functionID" <br>
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> "7","1","1" <br>
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> "124","1","10" <br>
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> "125","1","16" <br>
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> "547","1","9" <br>
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> "698","1","4" <br>
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> "59409854","3","8" <br>
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> "78546723","3","7" <br>
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> "81298355","3","16" <br>
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> "84578346","3","9" <br>
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> "84793478","3","10" <br>
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> "95847623","3","14" <br>
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> "458945040","2","17" <br>
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> "458945041","2","18" <br>
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> "458945042","2","2" <br>
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> "458945043","2","3" <br>
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> "458945044","2","21" <br>
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> "458945045","2","22" <br>
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> "1164736495","4","19" <br>
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> "1164736496","4","20" <br>
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> "1184894580","4","11" <br>
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> "1184894581","4","12" <br>
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> "1184894582","4","13" <br>
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> "1184894589","4","15" <br>
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> "1948573644","4","5" <br>
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> "1948573645","4","6" <br>
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> "1948573646","1","8"
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----------
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### Query 7
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All `codeValue` for `modelID 4`
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```sql
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SELECT `Code`.`codeValue`
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FROM `Code`
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CROSS JOIN `FunctionList`
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ON `Code`.`codeID` = `FunctionList`.`codeID`
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WHERE `FunctionList`.`modelID` = 4;
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```
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> [!NOTE|label:Result]
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> "codeValue" <br>
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> "1948573644" <br>
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> "1948573645" <br>
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> "1184894580" <br>
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> "1184894581" <br>
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> "1184894582" <br>
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> "1184894589" <br>
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> "1164736495" <br>
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> "1164736496"
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----------
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### Query 8
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The number of `codeValue` for `modelID 4`
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```sql
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SELECT COUNT(`Code`.`codeValue`)
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FROM `Code`
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JOIN `FunctionList`
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ON `Code`.`codeID` = `FunctionList`.`codeID`
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WHERE `FunctionList`.`modelID` = 4;
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```
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> [!NOTE|label:Result]
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> 8
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### Query 9
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All `codeValue` and `functionLabel` for Model with `modelName “SDi-Tuner-01”`
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```sql
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SELECT `Code`.`codeValue`, `Function`.`functionLabel`
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FROM `Model`
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JOIN `FunctionList` ON `Model`.`modelID` = `FunctionList`.`modelID`
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JOIN `Code` ON `FunctionList`.`codeID` = `Code`.`codeID`
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JOIN `Function` ON `FunctionList`.`functionID` = `Function`.`functionID`
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WHERE `Model`.`modelName` like 'SDi-Tuner-01'
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```
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> [!NOTE|label:Result]
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> "codeValue","functionLabel" <br>
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> "1948573644","Frequency down" <br>
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> "1948573645","Frequency up" <br>
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> "1184894580","Preset 1" <br>
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> "1184894581","Preset 2" <br>
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> "1184894582","Preset 3" <br>
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> "1184894589","Save preset" <br>
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> "1164736495","Tune down" <br>
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> "1164736496","Tune up"
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----------
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### Query 10
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The number of `Function` items per `modelName`
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```sql
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SELECT `Model`.`modelName`, COUNT(`FunctionList`.`functionID`)
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FROM `Model`
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LEFT JOIN `FunctionList` ON `Model`.`modelID` = `FunctionList`.`modelID`
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GROUP BY `Model`.`modelName`
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```
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> [!NOTE|label:Result]
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> "modelName","COUNT(`FunctionList`.`functionID`)" <br>
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> "MHC-900","6" <br>
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> "SDi-Ampli-01","6" <br>
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> "SDi-CdDvd-01","6" <br>
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> "SDi-Tuner-01","8" <br>
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> "UBP-X800M2","0" <br>
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> "TX-RZ70","0"
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----------
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### Query 11
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All `functionLabel` and `description` with their corresponding `modelID`, `functionID` and `codeID`. Be sure to include all `functionLabel` even if they are not used in any device !
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```sql
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SELECT `Function`.`functionLabel`, `Function`.`description`, `FunctionList`.`modelID`, `FunctionList`.`codeID`
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FROM `FunctionList`
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RIGHT JOIN `Function` ON `FunctionList`.`functionID` = `Function`.`functionID`;
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```
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> [!NOTE|label:Result]
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> "functionLabel","description","modelID","codeID" <br>
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> "Back","Fast backwards","1","1" <br>
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> "Bass down","Raise up the low frequencies. Cut off frequency : 200 Hz","2","14" <br>
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> "Bass up","Reduce the low frequencies. Cut off frequency : 200 Hz","2","15" <br>
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> "Forward","Fast forwards","1","5" <br>
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> "Frequency down","Tunes down","4","24" <br>
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> "Frequency up","Tunes up","4","25" <br>
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> "Next","Plays to the next track","3","7" <br>
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> "Open/Close tray","Open or close the player's tray","1","26" <br>
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> "Open/Close tray","Open or close the player's tray","3","6" <br>
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> "Pause","Pauses the current track","1","4" <br>
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> "Pause","Pauses the current track","3","9" <br>
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> "Play","Plays the selected track","1","2" <br>
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> "Play","Plays the selected track","3","10" <br>
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> Preset 1","Select the preset 1","4","20" <br>
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> "Preset 2","Select the preset 2","4","21" <br>
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> "Preset 3","Select the preset 3","4","22" <br>
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> "Previous","Plays to the previous track","3","11" <br>
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> "Save preset","Stores the current frequency to a preset","4","23" <br>
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> "Stop","Stops the current track","1","3" <br>
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> "Stop","Stops the current track","3","8" <br>
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> "Treble down","Reduce the high frequencies.Cut off frequency : 4000 Hz","2","12" <br>
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> "Treble up","Raise up the high frequencies. Cut off frequency : 4000 Hz","2","13" <br>
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> "Tune down","Slow down fine tuning","4","18""Tune up","Slow up fine tuning","4","19" <br>
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> "Volume down","Raise up the volume","2","16" <br>
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> "Volume up","Reduce the volume","2","17" <br>
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> "Input source","Select the source of the input (BD, DVD, HDMI, ...)",NULL,NULL <br>
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> "Audio format","Select the Audio format to use with the current source (2ch stereo, 5.1, 7.2, 9.2, ...)",NULL,NULL
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----------
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### Query 12
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All `functionLabel` and `description` of non-used functions in any device. (insert beforehand a new function in `Function`, with no reference in the `FunctionList` table). Add an unused function in the CSV file
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```sql
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SELECT `Function`.`functionLabel`, `Function`.`description`
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FROM `FunctionList`
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RIGHT JOIN `Function` ON `FunctionList`.`functionID` = `Function`.`functionID`
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WHERE `FunctionList`.`modelID` is NULL
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```
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> [!NOTE|label:Result]
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> "functionLabel","description" <br>
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> "Input source","Select the source of the input (BD, DVD, HDMI, ...)" <br>
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> "Audio format","Select the Audio format to use with the current source (2ch stereo, 5.1, 7.2, 9.2, ...)" <br>
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> "Test Function","This function should not be referenced in the FunctionList"
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----------
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# Test constraints
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### Test 1
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Try to insert a record in a table using an existing primary key.
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```sql
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INSERT INTO `Code`(`codeId`, `codeValue`)
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VALUES (1, 42)
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```
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> [!NOTE|label:Result]
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> #1062 - Duplicate entry '1' for key 'Code.PRIMARY'
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----------
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### Test 2
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Choose a table with at least a foreign key. Try to insert a record in that table, with the foreign key pointing to a non-existent record.
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```sql
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INSERT INTO `Model`(`modelId`, `manufacturerID`, `typeID`, `modelName`)
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VALUES (7, 1, 42, 'dummy test')
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```
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> [!NOTE|label:Result]
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> #1452 - Cannot add or update a child row: a foreign key constraint fails (`sdi04`.`Model`, CONSTRAINT `Model_ibfk_2` FOREIGN KEY (`typeID`) REFERENCES `Type` (`typeID`) ON DELETE RESTRICT ON UPDATE RESTRICT)
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----------
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### Test 3
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Try to delete the record with name “`HEVs`” in the table `Manufacturer`. Explain why this operation fails.
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```sql
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DELETE FROM `Manufacturer`
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WHERE `Manufacturer`.`manufacturerName` like 'HEVs'
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```
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> [!NOTE|label:Result]
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> #1451 - Cannot delete or update a parent row: a foreign key constraint fails (`sdi04`.`Model`, CONSTRAINT `Model_ibfk_1` FOREIGN KEY (`manufacturerID`) REFERENCES `Manufacturer` (`manufacturerID`) ON DELETE RESTRICT ON UPDATE RESTRICT)
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----------
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### Test 4
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Modify the foreign key definition in `Model` so that “`HEVs`” entry in `Manufacturer` can be deleted. The foreign key `manufacturerID` value in `Model` should be set to `NULL`. Test that it works as expected.
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```sql
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ALTER TABLE `Model` CHANGE `manufacturerID` `manufacturerID` INT NULL;
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ALTER TABLE `Model` DROP FOREIGN KEY `Model_ibfk_1`;
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ALTER TABLE `Model` ADD CONSTRAINT `Model_ibfk_1`
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FOREIGN KEY (`manufacturerID`) REFERENCES `Manufacturer`(`manufacturerID`)
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ON DELETE SET NULL ON UPDATE RESTRICT;
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DELETE FROM `Manufacturer`
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WHERE `Manufacturer`.`manufacturerName` like 'HEVs'
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```
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> [!NOTE|label:Result]
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> 1 row deleted
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----------
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### Test 5
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We want now to delete all `Model` entries somehow related to a manufacturer when the latter is deleted from `Manufacturer`. To implement this feature, we should add a constraint `ON DELETE CASCADE` for the `manufacturerID` foreign key in `Model`. Try this and notice that this does not work. The reason is the following: you are not allowed to delete an entry in `Model` because a `FunctionList` refers to that entry. You could use `ON DELETE CASCADE` for all foreign keys, but deleting a single `Manufacturer` can trigger deletion of a good portion of the database!
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```sql
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ALTER TABLE `Model` DROP FOREIGN KEY `Model_ibfk_1`;
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ALTER TABLE `Model` ADD CONSTRAINT `Model_ibfk_1`
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FOREIGN KEY (`manufacturerID`) REFERENCES `Manufacturer`(`manufacturerID`)
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ON DELETE CASCADE ON UPDATE CASCADE;
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DELETE FROM `Manufacturer`
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WHERE `Manufacturer`.`manufacturerName` like 'Sony'
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```
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> [!NOTE|label:Result]
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> #1451 - Cannot delete or update a parent row: a foreign key constraint fails (`sdi04`.`FunctionList`, CONSTRAINT `FunctionList_ibfk_3` FOREIGN KEY (`modelID`) REFERENCES `Model` (`modelID`) ON DELETE RESTRICT ON UPDATE RESTRICT)
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```sql
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DELETE FROM `Manufacturer`
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WHERE `Manufacturer`.`manufacturerName` like 'Onkyo'
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```
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> [!NOTE|label:Result]
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> 1 row deleted
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---------- |