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By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0. 1447721 fiddles created (18786 in the last week).
CREATE FUNCTION GetStringCount(@strValue VARCHAR(200), @charValue VARCHAR(200)) RETURNS VARCHAR(200) AS BEGIN RETURN (DATALENGTH(@strValue) - DATALENGTH(REPLACE(@strValue, @charValue, ''))) / DATALENGTH(@charValue) END
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 hidden batch(es)
SELECT dbo.GetStringCount('Hello World', 'l'); -- 3
(No column name)
3
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 hidden batch(es)
SELECT dbo.GetStringCount('Test Test', 'es'); -- 2
(No column name)
2
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 hidden batch(es)