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DataDirect OpenAccess SDK Help

Comparison operators

  • Last Updated: May 12, 2026
  • 2 minute read
    • OpenAccess SDK
    • Version 8.1
    • Documentation

Comparison operators compare one expression to another. The result of such a comparison can be TRUE, FALSE, or UNKNOWN. OpenAccess SDK considers the UNKNOWN result as FALSE. The following table describes the supported operators.

Comparison operators

Operator Purpose Example
= Equality test. SELECT * FROM emp WHERE sal = 1500;
!= <> Inequality test. SELECT * FROM emp WHERE sal != 1500;
> < "Greater than" and "less than" tests. SELECT * FROM emp WHERE sal > 1500;
SELECT * FROM emp WHERE sal < 1500;
>= <= "Greater than or equal to" and "less than or equal to" tests. <SELECT * FROM emp WHERE sal >= 1500;<
SELECT * FROM emp WHERE sal <= 1500;
IN "Equal to any member of" test. Equivalent to "= ANY" SELECT * FROM emp WHERE job IN ('CLERK','ANALYST');
SELECT * FROM emp WHERE sal IN (SELECT sal FROM emp WHERE deptno = 30);
NOT IN Equivalent to "!=ALL". Evaluates to FALSE if the values matches with any member of the set. SELECT * FROM emp WHERE sal NOT IN (SELECT sal FROM emp WHERE deptno = 30);
SELECT * FROM emp WHERE job NOT IN ('CLERK', ANALYST');
ANY SOME Compares a value to each value in a list or returned by a query. Must be preceded by =, !=, >, <, <=, >=. Evaluates to FALSE if the query returns no rows. SELECT * FROM emp WHERE sal = ANY (SELECT sal FROM emp WHERE deptno = 30);
ALL Compares a value to every value in a list or returned by a query. Must be preceded by =, !=, >, <, <=, >=. Evaluates to TRUE if the query returns no rows. SELECT * FROM emp WHERE sal >= ALL
(1400, 3000);

SELECT * FROM emp WHERE sal >= ALL (SELECT sal FROM emp WHERE empno < 0);
In the previous example, if the emp table has no records with empno < 0, the result of sal >= ALL (subquery) is always TRUE if sal is not NULL.
[NOT] BETWEEN x AND y [Not] greater than or equal to x and less than or equal to y. SELECT * FROM emp WHERE sal BETWEEN 2000 AND 3000;
EXISTS TRUE if a subquery returns at least one row. SELECT ename, deptno FROM dept WHERE EXISTS (SELECT * FROM emp WHERE dept.deptno = emp.deptno);
x [NOT] LIKE y[ESCAPE 'z'] TRUE if x does [not] match the pattern y. Within y, the character "%" matches any string of zero or more characters except null. The character "_" matches any single character. Any character, except percent (%) and underscore (_) may follow ESCAPE. A wildcard character is treated as a literal if preceded by the character designated as the escape character SELECT * FROM emp WHERE ename LIKE 'A_C/%E%' ESCAPE '/';
IS [NOT] NULL Tests for nulls. This is the only operator to use for testing for nulls SELECT ename, deptno FROM emp WHERE comm IS NULL;
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