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Equality and inequality

Equality and inequality expressions return the result of an equality comparison of its operands.

 

Expression	Character representation	Returns
Equality	== eq	True (1) when both operands compare identically, and false (0) if they do not compare identically.
Inequality	<> ne	True (1) when both operands do not compare identically, and false (0) if they compare identically.

The following special cases also apply when using equality operators:

•	If either operand is null, a null comparison is performed. Null-valued operands compare identically whenever both operands are null, and compare differently whenever one operand is not null.

•	If both operands are references, both operands compare identically when they both refer to the same object, and compare differently when they do not refer to the same object.

•	If both operands are string valued, a locale-sensitive lexicographic string comparison is performed on the operands. Otherwise, if they are not both null, the operands are promoted to numeric values, and a numeric comparison is performed.

These are examples of using the equality and inequality expressions:

 

Expression	Returns
3 == 3	1 (true)
3 <> 4	1 (true)
“abc” eq “def”	0 (false)
“def” ne “abc”	1 (true)
5 + 5 == 10	1 (true)
5 + 5 <> “10″	0 (false)

Equality and inequality