sql alter table statement: add, modify or delete operation

ALTER TABLE statement: used to add, modify or delete an existing table.

 

1. Modify the table name: alter table onetest rename to test;

2、添加列：alter table table_name add column col_name datatype;

3、修改列名：alter table table_name change old_name new_name datatype;

4. Modify column attributes: alter table table_name modify col_name datatype;

5. Delete column: alter table table_name drop column col_name;