Explain select command : Simple Select « Select Clause « SQL / MySQL

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21. Where Clause
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SQL / MySQL » Select Clause » Simple Select 
Explain select command

  
CREATE TABLE Manufacturers
(
   ManfID CHAR(8NOT NULL PRIMARY KEY,
   ManfName VARCHAR(30NOT NULL
)
ENGINE=INNODB;


INSERT INTO Manufacturers
VALUES ('abc123', 'ABCqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq'),
       ('def456', 'DEFwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww'),
       ('ghi789', 'GHIeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee'),
       ('jkl123', 'JKLrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr'),
       ('mno456', 'MNOttttttttttttttttttttttttttttttttttttttttttttttttttttttt');


CREATE TABLE Parts
(
   PartID SMALLINT NOT NULL PRIMARY KEY,
   PartName VARCHAR(30NOT NULL,
   ManfID CHAR(8NOT NULL
)
ENGINE=INNODB;


INSERT INTO Parts
VALUES (101'DVD burnerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr', 'abc123'),
       (102'CD driveeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee', 'jkl123'),
       (103'80-GB hard diskkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk', 'mno456'),
       (104'Mini-towerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr', 'ghi789'),
       (105'Power supplyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy', 'def456'),
       (106'LCD monitorrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr', 'mno456'),
       (107'Zip driveeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee', 'ghi789'),
       (108'Floppy driveeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee', 'jkl123'),
       (109'Network adapterrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr', 'def456'),
       (110'Network hubbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb', 'jkl123'),
       (111'Routerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr', 'mno456'),
       (112'Sound cardddddddddddddddddddddddddddddddddddd', 'ghi789'),
       (113'Standard keyboarddddddddddddddddddddddddddddd', 'mno456'),
       (114'PS/mouseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee', 'jkl123'),
       (115'56-K modemmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm', 'ghi789'),
       (116'Display adapterrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr', 'mno456'),
       (117'IDE controllerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr', 'def456');


SELECT PartName, ManfName
FROM Parts AS p, Manufacturers as m
WHERE p.ManfID = m.ManfID
ORDER BY PartName;


EXPLAIN SELECT PartName, ManfName
FROM Parts AS p, Manufacturers as m
WHERE p.ManfID = m.ManfID
ORDER BY PartName;



           
       
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