sql server 保留小数（续A）

浏览数：33 / 时间：2015年06月12日

写完上一篇文章后，陆续有朋友给出了其他思路，我在小结在这篇博客中。

思路一：转换成字符串后输出（这也是上一篇文章给的思路）

1 1 SELECT  CASE  WHEN @a % @b = 0  THEN CAST(@a / @b AS VARCHAR(16)) 
2 2               ELSE  CAST(CAST(@a * 1.0 / @b AS DECIMAL(10,4)) AS VARCHAR(32)) END ‘12 / 5‘,
3 3         CASE  WHEN @c % @d = 0  THEN CAST(@c / @d AS VARCHAR(16))
4 4               ELSE  CAST(CAST(@c * 1.0 / @d AS DECIMAL(10,4)) AS VARCHAR(32)) END ‘12 / 3‘

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思路二：使用Replace()函数来判断小数点后面的形式

1 DECLARE @a INT,@b INT,@c INT,@d INT
2 SET @a    = 12
3 SET @b  = 5
4 SET @c = 12
5 SET @d = 3        
6 SELECT REPLACE(CAST(@a * 1.0 / @b AS DECIMAL(10,4)),‘.0000‘,‘‘) ‘12 / 5‘,
7        REPLACE(CAST(@c * 1.0 / @d AS DECIMAL(10,4)),‘.0000‘,‘‘) ‘12 / 3‘

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思路三：使用Round()函数判断四舍五入后的结果与原始结果是否相等

 1 DECLARE @a INT,@b INT,@c INT,@d INT
 2 SET @a    = 12
 3 SET @b  = 5
 4 SET @c = 12
 5 SET @d = 3    
 6 SELECT      CASE   WHEN ROUND(@a * 1.0 / @b,0) = @a * 1.0 / @b  THEN  CAST(@a / @b AS VARCHAR(16))
 7                  ELSE CAST(CAST(@a * 1.0 / @b AS DECIMAL(10,4)) AS VARCHAR(32)) END ‘12 / 5‘,
 8                  
 9           CASE   WHEN ROUND(@c * 1.0 / @d,0) = @c * 1.0 / @d THEN  CAST(@c / @d AS VARCHAR(16)) 
10                  ELSE CAST(CAST(@c * 1.0 / @d AS DECIMAL(10,4)) AS VARCHAR(32)) END ‘12 / 3‘