DEFAULT Predicate (default_predicate)

By specifying a DEFAULT predicate (default_predicate), you can check whether a column contains the DEFAULT value defined for this column.

Structure

Syntax Syntax

<default_predicate> ::=
  <column_spec> <comp_op> DEFAULT

<comp_op> ::=
  < 
| > 
| <> 
| != 
| = 
| <= 
| >=
| ~= <!  for computers with ASCII code  !>
| ~< <!  for computers with ASCII code  !>
| ~> <!  for computers with ASCII code  !>

End of the code.

Explanation

A DEFAULT specification must be made for the specified column. This can be done in the following SQL statements:

CREATE TABLE Statement
ALTER TABLE Statement

If the column contains the NULL value, <column_spec><comp_op> DEFAULT is undefined.

The rules for comparing values or value lists, as defined for comparison predicates, apply here.