ABS
绝对值
# 绝对值 二进制
select val, abs(val) as abs, bin(val) as bin
from math_test;
BIN
10进制——>二进制
# 绝对值 二进制
select val, abs(val) as abs, bin(val) as bin
from math_test;
CEILING
向上取整
# 取整
select val, ceiling(val) as up, floor(val) as down
from math_test;
CONV
进制转换
# 进制转换
select val, conv(val, 10, 16) as conv
from math_test;
FLOOR
向下取整
# 取整
select val, ceiling(val) as up, floor(val) as down
FORMAT
保留小数
# 保留小数
select val, format(val, 1) as format
from math_test;
HEX
转十六进制
# 十六进制
select val, hex(val)
from math_test;
LEAST
求最小值
# 最小值
select val, least(val,3) as least
from math_test;
MOD
求余数
# 求余数
select val,mod(val,2)as mod_2
from math_test;
RAND
随机数
# 随机数
select rand()
from dual;
