clickhouseHow to create user-defined function

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

`CREATE FUNCTION` creates specified function	`test` 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