我正在尝试运行此查询,但在进行数学计算后似乎没有正确格式化数字。比例应为 2,但不会按应有的方式显示。
SELECT 30 / 60 as Diff FROM Table
这返回为0
SELECT Convert( Numeric(8,2), 30 / 60 ) as Diff FROM Table
这返回为0.00
我如何让它0.50
根据需要返回?
我正在尝试运行此查询,但在进行数学计算后似乎没有正确格式化数字。比例应为 2,但不会按应有的方式显示。
SELECT 30 / 60 as Diff FROM Table
这返回为0
SELECT Convert( Numeric(8,2), 30 / 60 ) as Diff FROM Table
这返回为0.00
我如何让它0.50
根据需要返回?
您可以尝试以下方法,实现它的方法很少。在字段本身上使用变量CAST
,或者只是执行。CONVERT
SELECT (CAST(30 AS DECIMAL(8,2)) / CAST(60 AS DECIMAL(8,2))) as Diff FROM Table
SELECT (CAST(30/60) AS DECIMAL(8,2)) as Diff FROM Table
SELECT (30/60.0) as Diff FROM Table;
SELECT CONVERT(DECIMAL(8,2), 30/60.0) as Diff FROM Table
请查看此MSDN 文章以供进一步参考:
在进行除法或除实数而不是整数之前转换为数字。在进行整数运算时,任何小数部分都会被丢弃。在分数被删除后转换对你没有任何好处。
SELECT CONVERT(NUMERIC(8,2),30.0/60.0) AS DIFF FROM TABLE
或者如果选择列而不是使用数字
SELECT CONVERT(NUMERIC(8,2),columnA)/CONVERT(NUMERIC(8,2),columnB) AS DIFF FROM TABLE
(转换两者只是为了确保根据我们想要的规则完成划分)