Klagarge/Yggdrasil

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Klagarge fbef6eceee fix display lab

2024-02-29 15:26:04 +01:00

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Lab databases

Create & populate tables

Queries

Query 1

The description of all Function

SELECT `description` FROM `Function`

[!NOTE|label:Result]

"description"
"Fast backwards"
"Raise up the low frequencies. Cut off frequency : 200 Hz"
"Reduce the low frequencies. Cut off frequency : 200 Hz"
"Fast forwards"
"Tunes down"
"Tunes up"
"Plays to the next track"
"Open or close the player's tray"
"Pauses the current track"
"Plays the selected track"
"Select the preset 1"
"Select the preset 2"
"Select the preset 3"
"Plays to the previous track"
"Stores the current frequency to a preset"
"Stops the current track"
"Reduce the high frequencies.Cut off frequency : 4000 Hz"
"Raise up the high frequencies. Cut off frequency : 4000 Hz"
"Slow down fine tuning"
"Slow up fine tuning"
"Raise up the volume"
"Reduce the volume"
"Select the source of the input (BD, DVD, HDMI, ...)"
"Select the Audio format to use with the current source (2ch stereo, 5.1, 7.2, 9.2, ...)"

Query 2

The name of manufacturers that have at least one entry in the Model table

SELECT `Manufacturer`.`manufacturerName`
FROM `Manufacturer`
WHERE EXISTS( SELECT *
             FROM `Model`
             WHERE `Model`.`manufacturerID`=`Manufacturer`.`manufacturerID`)

[!NOTE|label:Result]

"manufacturerName"
"HEVs"
"Sony"
"Onkyo"

Query 3

The modelName of device models together with the manufacturerName of their manufacturers

SELECT `Model`.`modelName`, `Manufacturer`.`manufacturerName`
FROM `Model`, `Manufacturer`
WHERE `Model`.`manufacturerID` = `Manufacturer`.`manufacturerID`

[!NOTE|label:Result]

"modelName","manufacturerName"
"MHC-900","Sony"
"SDi-Ampli-01","HEVs" "SDi-CdDvd-01","HEVs"
"SDi-Tuner-01","HEVs"
"UBP-X800M2","Sony"
"TX-RZ70","Onkyo"

Query 4

The description of the Function with functionLabel “Stop”

SELECT `Function`.`description`
FROM `Function`
WHERE `Function`.`functionLabel` like 'Stop'

[!NOTE|label:Result] "description"
"Stops the current track"

Query 5

The functionLabel for Function with functionID > 10 and with a description containing the word “preset” (SQL wildcard character is “%”)

SELECT `Function`.`functionLabel`
FROM `Function`
WHERE `Function`.`functionID` > '10' AND `Function`.`description` like '%preset%'

[!NOTE|label:Result] "functionLabel"
"Preset 1"
"Preset 2"
"Preset 3"
"Save preset"

Query 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 With JOIN keyword
26 elements in 0,0003 seconds

SELECT `Code`.`codeValue`, `FunctionList`.`modelID`, `FunctionList`.`functionID`
FROM `Code`
JOIN `FunctionList`
ON `Code`.`codeID` = `FunctionList`.`codeID`;

[!NOTE|label:Result] "codeValue","modelID","functionID"
"7","1","1"
"124","1","10"
"125","1","16"
"547","1","9"
"698","1","4"
"59409854","3","8"
"78546723","3","7"
"81298355","3","16"
"84578346","3","9"
"84793478","3","10"
"95847623","3","14"
"458945040","2","17"
"458945041","2","18"
"458945042","2","2"
"458945043","2","3"
"458945044","2","21"
"458945045","2","22"
"1164736495","4","19"
"1164736496","4","20"
"1184894580","4","11"
"1184894581","4","12"
"1184894582","4","13"
"1184894589","4","15"
"1948573644","4","5"
"1948573645","4","6"
"1948573646","1","8"

Without JOIN keyword
26 elements in 0,0002 seconds

SELECT `Code`.`codeValue`, `FunctionList`.`modelID`, `FunctionList`.`functionID`
FROM `Code`, `FunctionList`
WHERE `Code`.`codeID` = `FunctionList`.`codeID`;

[!NOTE|label:Result] "codeValue","modelID","functionID"
"7","1","1"
"124","1","10"
"125","1","16"
"547","1","9"
"698","1","4"
"59409854","3","8"
"78546723","3","7"
"81298355","3","16"
"84578346","3","9"
"84793478","3","10"
"95847623","3","14"
"458945040","2","17"
"458945041","2","18"
"458945042","2","2"
"458945043","2","3"
"458945044","2","21"
"458945045","2","22"
"1164736495","4","19"
"1164736496","4","20"
"1184894580","4","11"
"1184894581","4","12"
"1184894582","4","13"
"1184894589","4","15"
"1948573644","4","5"
"1948573645","4","6"
"1948573646","1","8"

Query 7

All codeValue for modelID 4

SELECT `Code`.`codeValue`
FROM `Code`
CROSS JOIN `FunctionList`
ON `Code`.`codeID` = `FunctionList`.`codeID`
WHERE `FunctionList`.`modelID` = 4;

[!NOTE|label:Result] "codeValue"
"1948573644"
"1948573645"
"1184894580"
"1184894581"
"1184894582"
"1184894589"
"1164736495"
"1164736496"

Query 8

The number of codeValue for modelID 4

SELECT COUNT(`Code`.`codeValue`)
FROM `Code`
JOIN `FunctionList`
ON `Code`.`codeID` = `FunctionList`.`codeID`
WHERE `FunctionList`.`modelID` = 4;

[!NOTE|label:Result] 8

Query 9

All codeValue and functionLabel for Model with modelName “SDi-Tuner-01”

SELECT `Code`.`codeValue`, `Function`.`functionLabel`
FROM `Model`
JOIN `FunctionList` ON `Model`.`modelID` = `FunctionList`.`modelID`
JOIN `Code` ON `FunctionList`.`codeID` = `Code`.`codeID`
JOIN `Function` ON `FunctionList`.`functionID` = `Function`.`functionID`
WHERE `Model`.`modelName` like 'SDi-Tuner-01'

[!NOTE|label:Result] "codeValue","functionLabel"
"1948573644","Frequency down"
"1948573645","Frequency up"
"1184894580","Preset 1"
"1184894581","Preset 2"
"1184894582","Preset 3"
"1184894589","Save preset"
"1164736495","Tune down"
"1164736496","Tune up"

Query 10

The number of Function items per modelName

SELECT `Model`.`modelName`, COUNT(`FunctionList`.`functionID`)
FROM `Model`
LEFT JOIN `FunctionList` ON `Model`.`modelID` = `FunctionList`.`modelID`
GROUP BY `Model`.`modelName`

[!NOTE|label:Result] "modelName","COUNT(FunctionList.functionID)"
"MHC-900","6"
"SDi-Ampli-01","6"
"SDi-CdDvd-01","6"
"SDi-Tuner-01","8"
"UBP-X800M2","0"
"TX-RZ70","0"

Query 11

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 !

SELECT `Function`.`functionLabel`, `Function`.`description`, `FunctionList`.`modelID`, `FunctionList`.`codeID`
FROM `FunctionList`
RIGHT JOIN `Function` ON `FunctionList`.`functionID` = `Function`.`functionID`;

[!NOTE|label:Result] "functionLabel","description","modelID","codeID"
"Back","Fast backwards","1","1"
"Bass down","Raise up the low frequencies. Cut off frequency : 200 Hz","2","14"
"Bass up","Reduce the low frequencies. Cut off frequency : 200 Hz","2","15"
"Forward","Fast forwards","1","5"
"Frequency down","Tunes down","4","24"
"Frequency up","Tunes up","4","25"
"Next","Plays to the next track","3","7"
"Open/Close tray","Open or close the player's tray","1","26"
"Open/Close tray","Open or close the player's tray","3","6"
"Pause","Pauses the current track","1","4"
"Pause","Pauses the current track","3","9"
"Play","Plays the selected track","1","2"
"Play","Plays the selected track","3","10"
Preset 1","Select the preset 1","4","20"
"Preset 2","Select the preset 2","4","21"
"Preset 3","Select the preset 3","4","22"
"Previous","Plays to the previous track","3","11"
"Save preset","Stores the current frequency to a preset","4","23"
"Stop","Stops the current track","1","3"
"Stop","Stops the current track","3","8"
"Treble down","Reduce the high frequencies.Cut off frequency : 4000 Hz","2","12"
"Treble up","Raise up the high frequencies. Cut off frequency : 4000 Hz","2","13"
"Tune down","Slow down fine tuning","4","18""Tune up","Slow up fine tuning","4","19"
"Volume down","Raise up the volume","2","16"
"Volume up","Reduce the volume","2","17"
"Input source","Select the source of the input (BD, DVD, HDMI, ...)",NULL,NULL
"Audio format","Select the Audio format to use with the current source (2ch stereo, 5.1, 7.2, 9.2, ...)",NULL,NULL

Query 12

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

SELECT `Function`.`functionLabel`, `Function`.`description`
FROM `FunctionList`
RIGHT JOIN `Function` ON `FunctionList`.`functionID` = `Function`.`functionID`
WHERE `FunctionList`.`modelID` is NULL

[!NOTE|label:Result] "functionLabel","description"
"Input source","Select the source of the input (BD, DVD, HDMI, ...)"
"Audio format","Select the Audio format to use with the current source (2ch stereo, 5.1, 7.2, 9.2, ...)"
"Test Function","This function should not be referenced in the FunctionList"

Test constraints

Test 1

Try to insert a record in a table using an existing primary key.

INSERT INTO `Code`(`codeId`, `codeValue`)
VALUES (1, 42)

[!NOTE|label:Result] #1062 - Duplicate entry '1' for key 'Code.PRIMARY'

Test 2

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.

INSERT INTO `Model`(`modelId`, `manufacturerID`, `typeID`, `modelName`)
VALUES (7, 1, 42, 'dummy test')

[!NOTE|label:Result] #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)

Test 3

Try to delete the record with name “HEVs” in the table Manufacturer. Explain why this operation fails.

DELETE FROM `Manufacturer`
WHERE `Manufacturer`.`manufacturerName` like 'HEVs'

[!NOTE|label:Result] #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)

Test 4

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.

ALTER TABLE `Model` CHANGE `manufacturerID` `manufacturerID` INT NULL;

ALTER TABLE `Model` DROP FOREIGN KEY `Model_ibfk_1`;

ALTER TABLE `Model` ADD  CONSTRAINT `Model_ibfk_1`
FOREIGN KEY (`manufacturerID`) REFERENCES `Manufacturer`(`manufacturerID`)
ON DELETE SET NULL ON UPDATE RESTRICT;

DELETE FROM `Manufacturer`
WHERE `Manufacturer`.`manufacturerName` like 'HEVs'

[!NOTE|label:Result] 1 row deleted

Test 5

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!

ALTER TABLE `Model` DROP FOREIGN KEY `Model_ibfk_1`;

ALTER TABLE `Model` ADD  CONSTRAINT `Model_ibfk_1`
FOREIGN KEY (`manufacturerID`) REFERENCES `Manufacturer`(`manufacturerID`)
ON DELETE CASCADE ON UPDATE CASCADE;

DELETE FROM `Manufacturer`
WHERE `Manufacturer`.`manufacturerName` like 'Sony'

[!NOTE|label:Result] #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)

DELETE FROM `Manufacturer`
WHERE `Manufacturer`.`manufacturerName` like 'Onkyo'