Mysql adds columns to modify column name attributes and deletes columns _ MySQL

Mysql adds a column to modify the column name attribute and deletes the column bitsCN.com

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Mysql modifies the table name, column name, column type, adds a table column, and deletes a table column.

Modify the table name (testtable, newtablename)

Alter table testtable rename newtablename;

Add table columns:

Alter table testtable add column name varchar (40 );

Delete column:

Alter table testtable drop column name;

Modify the column type:

Alter table testtable modify address char (40)

Alternatively, alter table testtable change address char (40)

Alter table column name

Alter table testtable change column address address1 varchar (30)

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