SQRT(X)

Returns the square root of X. If X is negative, NULL is returned.

SELECT SQRT(4); +---------+ | SQRT(4) | +---------+ | 2 | +---------+ SELECT SQRT(20); +------------------+ | SQRT(20) | +------------------+ | 4.47213595499958 | +------------------+ SELECT SQRT(-16); +-----------+ | SQRT(-16) | +-----------+ | NULL | +-----------+ SELECT SQRT(1764); +------------+ | SQRT(1764) | +------------+ | 42 | +------------+

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https://mariadb.com/kb/en/sqrt/