109 lines
2.9 KiB
Markdown
109 lines
2.9 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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#### 1) 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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#### 2) 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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#### 3) 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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#### 4) 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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#### 5) 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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#### 6) 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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```sql
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```
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> [!NOTE|label:Result]
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>
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# Test constraints |