ALTER TABLE statement modifies the table accordingly : Alter Table « Table Index « SQL / MySQL






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ALTER TABLE statement modifies the table accordingly

     

CREATE TABLE Books
(
    BookID SMALLINT NOT NULL,
    BookName VARCHAR(40) NOT NULL,
    PubID SMALLINT NOT NULL DEFAULT 'Unknown'
)
ENGINE=INNODB;

ALTER TABLE Books
ADD PRIMARY KEY (BookID),
ADD CONSTRAINT fk_1 FOREIGN KEY (PubID) REFERENCES Publishers (PubID),
ADD COLUMN Format ENUM('paperback', 'hardcover') NOT NULL AFTER BookName;








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33.Alter table to add an index
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35.Alter table to Delete an Index
36.Alter table to add index
37.To drop an index with ALTER TABLE
38.Reduce the number of significant characters per index in the index to the first 16 characters
39.Add IGNORE to the statement, then use SELECT to have a look at the table contents to see how the duplicates ha
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