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sqlsErvEr 相减

相减只有数字类型或日期类型可以操作,如果两个字符型字段存储的是数字或者日期格式的内容,可对两个字段进行转换,然后再作相减操作; 如:两个字符型(数字)的字段 ID1 ID2 1 2 2 4 执行语句: select cast(ID2 as int)-cast(ID1 as int) fro...

select (select sum(getmoney) from a) -(select sum(paymoney) from b)

用外连接 select a.id,a.value-isnull(b.value,0) from a left join b on a.id=b.id

楼上说的都不对,如果有空值的话,那样想减还是空值,应该这样: SELECT isnull(A,0)-isnull(B,0) AS 结果 FROM 表 --sqlserver语法 SELECT nvl(A,0)-nvl(B,0) AS 结果 FROM 表 --Oracle语法 SELECT ifnull(A,0)-ifnull(B,0) AS 结果 FROM 表 --...

表结构? 测试数据? 按哪一列排序? 测试数据. CREATE TABLE temp ( year INT, salary INT ); INSERT INTO temp VALUES(2000, 1000); INSERT INTO temp VALUES(2001, 2000); INSERT INTO temp VALUES(2002, 3000); INSERT INTO temp VALUES(200...

select id,abs(result-200)as n from table order by n desc;

完全不懂什么叫做集合相减,我理解的集合相减应该是指的inner join,只保留共有的部分 inner join(等值连接) 只返回两个表中联结字段相等的行 right join(右联接) 返回包括右表中的所有记录和左表中联结字段相等的记录 full join(全链接) 返回包...

SELECT ISNULL(A字段,0)-ISNULL(B字段,0) FROM 表

select datediff(s,'2012-12-11 8:00:00','2012-12-11 08:31:47') 结果是1907 (秒) 语法 DATEDIFF ( datepart , startdate , enddate ) datepart 缩写 year yy, yyyy quarter qq, q month mm, m dayofyear dy, y day dd, d week wk, ww hour hh ...

declare @time1 datetime,@time2 datetimeset @time1='2016-11-24'set @time2='2015-11-11'select DATEDIFF(day,@time1,@time2) as [day],DATEDIFF(week,@time1,@time2) as [week],datediff(year,@time1,@time2) as [year] datediff函数,第一个...

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