isNull
Tests a value, and returns a long value of 1 if NULL, 0 if not.
Syntax:
isNull(testVal)
SELECT isNull(myColumn) FROM myTable;
Added in version 7.02.1405382000 20140714. Note that SQL NULL is
not yet fully supported in Texis (including in tables). Also note
that Texis isNull behavior differs from some other SQL
implementations; see also ifNull.
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