AVG()
COUNT()
MAX()
MIN()
SUM()
ABS()
CEIL()
COS()
FLOOR()
SIN()
SQRT()
TAN()
BIT_LENGTH()
CHAR_LENGTH()
OCTET_LENGTH()
Return the bit length of a string.
bit_length(<string>)
Return the character length of a string.
char_length(<string>)
Return the octet length of a string.
octet_length(<string>)