oracle学习（五）--数字类型操作函数

oracle学习（五）--数字类型操作函数

--绝对值

SELECT "ABS"(-123) FROM dual;-->123

--向上取整

SELECT "CEIL"(123.22) FROM dual;-->124

SELECT "CEIL"(-123.22) FROM dual;-->-123

--向下取整

SELECT "FLOOR"(123.22) FROM dual;-->123

SELECT "FLOOR"(-123.22) FROM dual;-->-124

--取余数

SELECT "MOD"(5, 2) FROM dual;-->1

--判断正负

SELECT "SIGN"(12) FROM dual;-->1

SELECT "SIGN"(-12) FROM dual;-->-1

--开平方

SELECT "SQRT"(16) FROM dual;-->4

--幂

SELECT "POWER"(3, 4) FROM dual;-->81

--取固定位数

SELECT "TRUNC"(12.123, 2) FROM dual;-->12.12

SELECT "TRUNC"(12.123) FROM dual;-->12

--根据ASCII码返回字符

SELECT "CHR"(65) FROM dual;-->A

--四舍五入

SELECT "ROUND"(467.37, 1) FROM dual;-->467.40

SELECT "ROUND"(467.37, -1) FROM dual;-->470

SELECT "ROUND"(467.37) FROM dual;-->467

SELECT "ROUND"(467.57) FROM dual;-->468

--格式化数字

SELECT "TO_CHAR"(12.78,'000.000') FROM dual;--> 012.780

SELECT "TO_CHAR"(12.78,'999.999') FROM dual;-->  12.780

SELECT "TO_CHAR"(0.78,'999.999') FROM dual;-->    .780

SELECT "TO_CHAR"(0.78,'990.999') FROM dual;-->   0.780

SELECT "TO_CHAR"(1234567980123,'9,999,999,999,990.00') FROM dual;--> 1,234,567,980,123.00

--FM用于去掉多余的空格和0

SELECT "TO_CHAR"(12.78,'FM000.000') FROM dual;-->012.780

SELECT "TO_CHAR"(12.78,'FM999.999') FROM dual;-->12.78

SELECT "TO_CHAR"(0.78,'FM999.999') FROM dual;-->.78

SELECT "TO_CHAR"(0.78,'FM990.999') FROM dual;-->0.78

SELECT "TO_CHAR"(1234567980123,'FM9,999,999,999,990.00') FROM dual;-->1,234,567,980,123.00

--美元符号

SELECT "TO_CHAR"(12.78,'FM$000.000') FROM dual;-->$012.780

SELECT "TO_CHAR"(12.78,'FM$999.999') FROM dual;-->$12.78

SELECT "TO_CHAR"(0.78,'FM$999.999') FROM dual;-->$.78

SELECT "TO_CHAR"(0.78,'FM$990.999') FROM dual;-->$0.78

SELECT "TO_CHAR"(1234567980123,'FM$9,999,999,999,990.00') FROM dual;-->$1,234,567,980,123.00

--本地钱字符

SELECT "TO_CHAR"(12.78,'FML000.000') FROM dual;-->￥012.780

SELECT "TO_CHAR"(12.78,'FML999.999') FROM dual;-->￥12.78

SELECT "TO_CHAR"(0.78,'FML999.999') FROM dual;-->￥.78

SELECT "TO_CHAR"(0.78,'FML990.999') FROM dual;-->￥0.78

SELECT "TO_CHAR"(1234567980123,'FML9,999,999,999,990.00') FROM dual;-->￥1,234,567,980,123.00

--返回数据库所在地区的货币码

SELECT "TO_CHAR"(12.78,'FM000.000C') FROM dual;-->012.780CNY

SELECT "TO_CHAR"(12.78,'FM999.999C') FROM dual;-->12.78CNY

SELECT "TO_CHAR"(0.78,'FM999.999C') FROM dual;-->.78CNY

SELECT "TO_CHAR"(0.78,'FM990.999C') FROM dual;-->0.78CNY

SELECT "TO_CHAR"(1234567980123,'FM9,999,999,999,990.00C') FROM dual;-->1,234,567,980,123.00CNY

--转换成16进制

SELECT "TO_CHAR"(255,'FMx') FROM dual;-->##

SELECT "TO_CHAR"(255,'FMxx') FROM dual;-->ff

SELECT "TO_CHAR"(255,'FMxxxxxxxxxx') FROM dual;-->ff