MySQL 9.3 Reference Manual Including MySQL NDB Cluster 9.3
The following SQL built-in functions can be called directly from
the mysql namespace. These are described in
the following list, along with their analogous SQL functions:
rand() (MySQL
RAND()): Returns a random
floating-point value v in the
range 0 <= v < 1.0.
sleep(
(MySQL seconds)SLEEP()): Pauses for
seconds seconds, then returns 0.
uuid() (MySQL
UUID()): Returns a Universal
Unique Identifier (UUID).
isUUID(
(MySQL argument)IS_UUID()): Returns 1
if the argument is a valid
string-format UUID, 0 if it is not a valid UUID, and
NULL if the argument is
NULL.