Two ALTER TABLE statements can be combined : Alter Table « Table Index « SQL / MySQL






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Two ALTER TABLE statements can be combined

     
mysql>
mysql> CREATE TABLE HeadOfState
    -> (
    ->     ID           INT NOT NULL,
    ->     LastName     CHAR(30) NOT NULL,
    ->     FirstName    CHAR(30) NOT NULL,
    ->     CountryCode  CHAR(3) NOT NULL,
    ->     Inauguration DATE NOT NULL
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql>
mysql> ALTER TABLE HeadOfState ADD PRIMARY KEY (ID), ADD INDEX (LastName,FirstName);
Query OK, 0 rows affected (0.01 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql>
mysql> drop table HeadOfState;
Query OK, 0 rows affected (0.00 sec)








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18.Use ALTER TABLE to change the column type
19.The Effect of ALTER TABLE on Null and Default Value Attributes
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22.ALTER TABLE statement modifies the table accordingly
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25.Alter table to add foreign key
26.Syntax for Altering a Column
27.Syntax for altering table and delete a Column
28.Storing Altered Character Strings
29.To drop a default value, use ALTER col_name DROP DEFAULT:
30.ALTER column to BINARY
31.Use the asterisk to try matching against the name ian or the alternative spelling, iain.
32.Specifying Multiple Alterations
33.Alter table to add an index
34.Alter table to add unique index
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
40.Change j from INT to BIGINT
41.MODIFY statement should specify the null and default value attributes explicitly
42.Redefine i to be NOT NULL, then try again
43.Change column definition