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clickhouseHow to create user-defined function

CREATE FUNCTION test AS (date, age) -> CONCAT(toString(age), ', ', toString(toYear(date)))ctrl + c

creates specified function


name of the function to create (so it can later be used)

(date, age)

arguments list of the function


implementation expression goes after this symbol

CONCAT(toString(age), ', ', toString(toYear(date)))

example of extracting a year from date argument and concatenating with age into final string