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SQRT(X)
You can call this function to return the square root of X.
obclient> SELECT SQRT(4);
+---------+
SQRT(4)
+---------+
2
+---------+
1 row in set (0.00 sec)
obclient> SELECT SQRT(5);
+------------------+
SQRT(5)
+------------------+
2.23606797749979
+------------------+
1 row in set (0.01 sec)
obclient> SELECT SQRT(-16);
+-----------+
SQRT(-16)
+-----------+
NULL
+-----------+
1 row in set (0.01 sec)