You can specify a new default value for a column that has no default value or modify the existing default value by using the ALTER COLUMN … SET DEFAULT. You can use the CHANGE clause to change the default value of multiple columns with a single statement. For details, see the CHANGE Clause.
ALTER [ TABLE | CLASS ] table_name ALTER [COLUMN] column_name SET DEFAULT value
;schema a_tbl
=== <Help: Schema of a Class> ===
<Class Name>
a_tbl
<Attributes>
name CHARACTER VARYING(1073741823)
phone CHARACTER VARYING(13) DEFAULT '000-0000-0000'
age INTEGER
id INTEGER AUTO_INCREMENT NOT NULL
<Constraints>
UNIQUE u_a_tbl_id ON a_tbl (id)
Current transaction has been committed.
ALTER TABLE a_tbl ALTER COLUMN name SET DEFAULT '';
ALTER TABLE a_tbl ALTER COLUMN phone SET DEFAULT '111-1111';
;schema a_tbl
=== <Help: Schema of a Class> ===
<Class Name>
a_tbl
<Attributes>
name CHARACTER VARYING(1073741823) DEFAULT ''
phone CHARACTER VARYING(13) DEFAULT '111-1111'
age INTEGER
id INTEGER AUTO_INCREMENT NOT NULL
<Constraints>
UNIQUE u_a_tbl_id ON a_tbl (id)