Background documentationDEFAULT Predicate (default_predicate) Locate this document in the navigation structure

 

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

Structure

Syntax Syntax

  1. <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:

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.