Question

how to set particular column as primary key with auto increment in mysql.am using alter statement . but am getting error when i excecute the alter statement in mysql.

alter statement
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 ALTER TABLE tbl_travelplan add COLUMN TRREQNO id INT(11) NOT NULL AUTO_INCREMENT, ADD PRIMARY KEY (id);    

Answer 1

I think the real problem is the space between TRREQNO and id in your query.
Try the query i have placed below:

ALTER TABLE tbl_travelplan add TRREQNO_id INT(11) NOT NULL primary KEY AUTO_INCREMENT;