IsNull

Table of Contents



Returns true (1) if the given value is null, otherwise false (0). This is how to test for missing fields and for the unmatched side of an outer join.

Boolean IsNull(String value = null)

Boolean results

Boolean functions return 1 for true and 0 for false. In a WHERE clause compare the result to 1 (or true), for example: WHERE IsLike(Text, 'Cat%') = 1


round-pushpin Selects words that have no matching language.
SELECT w.Text FROM WordList:Word as w OUTER JOIN WordList:Language as l ON l.Id = w.LanguageId WHERE IsNull(l.Name) = 1




SQL :: IsBetween
Returns true (1) if the value is within the given range, including the range boundaries.
SQL :: IsDouble
Returns true (1) if the given value can be converted to a decimal number.
SQL :: IsEmpty
Returns true (1) if the given value is null or an empty string.
SQL :: IsEqual
Returns true (1) if the two given values are equal. The comparison is case-sensitive.
SQL :: IsGreater
Returns true (1) if the first value is greater than the second.
SQL :: IsGreaterOrEqual
Returns true (1) if the first value is greater than or equal to the second.
SQL :: IsInteger
Returns true (1) if the given value is a whole number, with an optional leading sign.
SQL :: IsLess
Returns true (1) if the first value is less than the second.
SQL :: IsLessOrEqual
Returns true (1) if the first value is less than or equal to the second.
SQL :: IsLike
Returns true (1) if the text matches the pattern. The pattern uses the same wildcards as Like: % matches any number of characters and _ matches a single character.