October 14, 2013

extend a MySQL table with additional columns

Question- How will You extend a MySQL table with additional columns ?
Answer- 

MySQL tables are easy to extend with additional columns.


To add a column called email to the contacts table created in Create a basic MySQL table with a datatype of VARCHAR(80)

use the following SQL statement:

ALTER TABLE contacts ADD email VARCHAR(60);

This first statement will add the email column to the end of the table. To insert the new column after a specific column, such as name, use this statement:

ALTER TABLE contacts ADD email VARCHAR(60) AFTER name;

If you want the new column to be first, use this statement:

ALTER TABLE contacts ADD email VARCHAR(60) FIRST;

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