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 :: Sha256
Returns the SHA-256 hash of the value's UTF-8 bytes as a lower case hex string.
SQL :: Sha512
Returns the SHA-512 hash of the value's UTF-8 bytes as a lower case hex string.
SQL :: ShowScalarFunctions
Lists the built-in scalar functions with their parameters and descriptions.
SQL :: SubString
Returns length characters of the value, starting at the zero-based startIndex.
SQL :: Syntax
Basic KBSQL syntax and some examples.
SQL :: ToLower
Returns the value converted to lower case.
SQL :: ToNumeric
Returns the value converted to a number.
SQL :: ToProper
Returns the value with the first letter of each word capitalized (title case).
SQL :: ToString
Returns the number as a string, so that + concatenates it instead of adding it.
SQL :: ToUpper
Returns the value converted to upper case.