Note that in most databases the Syntax is slightly different.ĪLTER COLUMN suppl_name VARCHAR(100) NOT NULL ĪLTER COLUMN suppl_name SET NOT NULL Change several columns in the table Let’s see how to change the column named supplier_name using the ALTER TABLE command. SQL ALTER TABLE syntax for changing a column in an existing table.ĪLTER COLUMN column_name_id column_type_id ĪLTER COLUMN column_name_id TYPE column_definition_id This SQL ALTER TABLE example will add two columns: suppl_name as char(50) and city as char(45) to the suppl table. Let’s look at the SQL ALTER TABLE example, which adds more than one column. SQL ALTER TABLE syntax to add multiple columns to an existing table. This ALTER TABLE SQL example will add a column named suppl_name to the suppl table. Let’s take a look at the SQL ALTER TABLE example that adds a column. SQL syntax of ALTER TABLE statement to add a column to a table.
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