Can I use… is (binary comparison)


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  1. Supports is not distinct from
  2. Not for row-values

The not standardized binary is operator works in some SQL dialects like a null-safe comparison: It is similar to = but never returns unknown. Instead it returns false if only one argument is null or true if both arguments are null.

SELECT …
  FROM …
 WHERE c1 is c2

Note that this is not the same as the standardized unary is [not] null operator as it allows two arbitrary expressions to be compared.

Normative References

<=> is not defined in the SQL standard.

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