Application Programming and SQL Guide - Kmlinux

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If a search condition contains a column of a distinct type, the value to which that
column is compared must be of the same distinct type, or you must cast the value
to the distinct type. See Chapter 16, “Creating and using distinct types,” on page
359 for more information about distinct types.
Table 2 lists the type of comparison, the comparison operators, and an example of
how each type of comparison that you can use in a predicate in a WHERE clause.
Table 2. Comparison operators used in conditions
Type of comparison Comparison operator Example
Equal to = DEPTNO = ’X01’
Not equal to DEPTNO ’X01’
Less than < AVG(SALARY) < 30000
Less than or equal to = 21
Greater than > SALARY > 2000
Greater than or equal to >= SALARY >= 5000
Not greater than