使用数学函数查询

1.ABS




返回给定数字表达式的绝对值 ABS( numeric_expression )


select abs(-1.0),abs(0.0),abs(1.0)


go
2. DEGREES




当给出以弧度为单位的角度时，返回相应的以度数为单位的角度 DEGREES ( numeric_expression )


select 'PI/2 is '+ convert(varchar,degrees((pi()/2)))


go
3. RAND




返回0到1之间的随机float值 RAND ( [ seed ] )


declare @counter smallint


set @counter=1


while @counter<4


begin


select rand(@counter) 随机数


set nocount on


set @counter = @counter +1


set nocount off


end


go
4.ACOS




返回以弧度表示的角度值，该角度值的余弦为给定的 float 表达式；本函数亦称反余弦 ACOS ( float_expression )


SET NOCOUNT OFF


DECLARE @angle float


SET @angle = -1


SELECT 'The ACOS of the angle is: ' + CONVERT(varchar, ACOS(@angle))


go
5.EXP




返回所给的 float 表达式的指数值 EXP ( float_expression )


DECLARE @var float


SET @var = 378.615345498


SELECT 'The EXP of the variable is: ' + CONVERT(varchar,EXP(@var))


GO
6.ROUND




返回数字表达式并四舍五入为指定的长度或精度。ROUND ( numeric_expression , length [ , function ] )


select round(123.45178,2) ,round(123.98765,2),round(123.98765,-2),round(123.56789,0),round(123.56789,0,1)


go
7.ASIN




返回以弧度表示的角度值，该角度值的正弦为给定的 float 表达式；亦称反正弦 ASIN ( float_expression )


declare @angle float


set @angle =0.123


select convert(varchar,asin(@angle))


go
8.FLOOR




返回小于或等于所给数字表达式的最大整数。FLOOR ( numeric_expression )


select floor(123.456),floor(-123.456),floor($123.456)


go
9.SING




返回给定表达式的正 (+1)、零 (0) 或负 (-1) 号 SIGN ( numeric_expression )


DECLARE @value real


SET @value = -1


WHILE @value < 2


BEGIN


SELECT SIGN(@value)


SET NOCOUNT ON


SELECT @value = @value + 1


SET NOCOUNT OFF


END


SET NOCOUNT OFF


GO
10.ATAN




返回以弧度表示的角度值，该角度值的正切为给定的 float 表达式；亦称反正切 ATAN ( float_expression )


SELECT 'The ATAN of 0.1472738 is: ' + CONVERT(varchar, ATAN(0.1472738))


go
11.LOG




返回给定 float 表达式的自然对数 LOG ( float_expression )


DECLARE @var float


SET @var = 5.175643


SELECT 'The LOG of the variable is: ' + CONVERT(varchar,LOG(@var))


GO
12.SIN




以近似数字 (float) 表达式返回给定角度（以弧度为单位）的三角正弦值。SIN ( float_expression )


DECLARE @angle float


SET @angle = 45.175643


SELECT 'The SIN of the angle is: ' + CONVERT(varchar,SIN(@angle))


GO
13.ATN2




返回以弧度表示的角度值，该角度值的正切介于两个给定的 float 表达式之间；亦称反正切 ATN2 ( float_expression , float_expression )


DECLARE @angle1 float


DECLARE @angle2 float


SET @angle1 = 35.175643


SET @angle2 = 129.44


SELECT 'The ATN2 of the angle is: ' + CONVERT(varchar,ATN2(@angle1,@angle2 ))


GO
14.LOG10




返回给定 float 表达式的以 10 为底的对数 LOG10 ( float_expression )


DECLARE @var float


SET @var = 145.175643


SELECT 'The LOG10 of the variable is: ' + CONVERT(varchar,LOG10(@var))


GO
15.SQUARE




返回给定表达式的平方 SQUARE ( float_expression )


DECLARE @h float, @r float


SET @h = 5


SET @r = 1


SELECT PI()* SQUARE(@r)* @h AS 'Cyl Vol'


go
16.CEILING




返回大于或等于所给数字表达式的最小整数 CEILING ( numeric_expression )


SELECT CEILING($123.45), CEILING($-123.45), CEILING($0.0)


GO
17.PI




返回 PI 的常量值 PI ( )


select pi()


go
18.SQRT




返回给定表达式的平方根 SQRT ( float_expression )


DECLARE @myvalue float


SET @myvalue = 1.00


WHILE @myvalue < 10.00


BEGIN


SELECT SQRT(@myvalue)


SELECT @myvalue = @myvalue + 1


END


GO
19.COS




一个数学函数，返回给定表达式中给定角度（以弧度为单位）的三角余弦值 COS ( float_expression )


DECLARE @angle float


SET @angle = 14.78


SELECT 'The COS of the angle is: ' + CONVERT(varchar,COS(@angle))


GO
20.POWER




返回给定表达式乘指定次方的值 POWER ( numeric_expression , y )


DECLARE @value int, @counter int


SET @value = 2


SET @counter = 1




WHILE @counter < 5


BEGIN


SELECT POWER(@value, @counter)


SET NOCOUNT ON


SET @counter = @counter + 1


SET NOCOUNT OFF


END


GO
21.TAN




返回输入表达式的正切值 TAN ( float_expression )


SELECT TAN(PI()/2)


go
22.COT




一个数学函数，返回给定 float 表达式中指定角度（以弧度为单位）的三角余切值 COT ( float_expression )


DECLARE @angle float


SET @angle = 124.1332


SELECT 'The COT of the angle is: ' + CONVERT(varchar,COT(@angle))


GO
23.RADIANS




对于在数字表达式中输入的度数值返回弧度值 RADIANS ( numeric_expression )


DECLARE @angle float


SET @angle = -45.01


SELECT 'The RADIANS of the angle is: ' +


CONVERT(varchar, RADIANS(@angle))


GO