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4D v20 R7
is_null_predicate
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An is_null_predicate is used to find an arithmetic_expression with a NULL value. You can also pass the NOT keyword to find those without NULL values.
This example selects products whose weight is less than 15 or whose Color column contains a NULL value:
SELECT Name, Weight, Color
FROM PRODUCTS
WHERE Weight < 15.00 OR Color IS NULL
Produkt: 4D
Thema: Syntax rules
4D - SQL Reference ( 4D v20 R7)