Question

我有2个查询，我想在不使用union的情况下合并到1个结果集中。

查询1

select  datepart(yy,dateclosed)as 'Year',
    datepart(mm,dateclosed) as 'Month',
    count(*)as 'Total' 
from bug 
where projectid = 44 
and ifclosed = 1
and isnull(createdbyperson,1) <> '-1111111110'
and datepart(yy,dateclosed) > '2000'
group by datepart(yy,dateclosed), datepart(mm,dateclosed)
order by 1,2

查询2

select  datepart(yy,dateclosed)as 'Year',
    datepart(mm,dateclosed) as 'Month',
    count(*)as 'SameDay' 
from bug 
where   projectid = 44 
        and ifclosed = 1
        and isnull(createdbyperson,1) <> '-1111111110'
        and datepart(yy,dateclosed) > '2000' 
        and CONVERT(VARCHAR(10), dateclosed, 101) = CONVERT(VARCHAR(10), datecreated, 101) 
group by datepart(yy,dateclosed),datepart(mm,dateclosed)
order by 1,2

我喜欢将值返回为Year，Month，SameDay，Total。我该如何实现这一目标？联盟没有做我想做的事。我是否必须进行连接和表别名？子查询？

提前致谢。

Answer 1

好的......这个怎么样：

select a.Year, a.Month, b.SameDay, a.Total
from
(
select  datepart(yy,dateclosed)as 'Year',
    datepart(mm,dateclosed) as 'Month',
    count(*)as 'Total' 
from bug 
where projectid = 44 
and ifclosed = 1
and isnull(createdbyperson,1) <> '-1111111110'
and datepart(yy,dateclosed) > '2000'
group by datepart(yy,dateclosed), datepart(mm,dateclosed)
) a
inner join
(
select  datepart(yy,dateclosed)as 'Year',
    datepart(mm,dateclosed) as 'Month',
    count(*)as 'SameDay' 
from bug 
where   projectid = 44 
        and ifclosed = 1
        and isnull(createdbyperson,1) <> '-1111111110'
        and datepart(yy,dateclosed) > '2000' 
        and CONVERT(VARCHAR(10), dateclosed, 101) = CONVERT(VARCHAR(10), datecreated, 101) 
group by datepart(yy,dateclosed),datepart(mm,dateclosed)
) b
on a.Year = b.Year AND a.Month = b.Month
order by 1,2

Answer 2

试试这个：

SELECT DATEPART(yy,dateclosed) AS 'Year',
    DATEPART(mm,dateclosed) AS 'Month',
    SUM(IF(CONVERT(VARCHAR(10), dateclosed, 101) = CONVERT(VARCHAR(10), datecreated, 101), 1, 0)) AS SameDay,
    COUNT(*) AS 'Total' 
FROM bug 
WHERE projectid = 44 
    AND ifclosed = 1
    AND ISNULL(createdbyperson,1) <> '-1111111110'
    AND DATEPART(yy,dateclosed) > '2000'
GROUP BY DATEPART(yy,dateclosed), DATEPART(mm,dateclosed)
ORDER BY 1,2

Answer 3

如果不使用联合，您可以创建一个临时表，将两个查询的结果写入其中，然后查询临时表。

我怀疑你不应该这样做，而是要弄清楚为什么工会不适合你。

你有什么尝试？

发生了什么事？

Answer 4

为什么要这样做？您是否知道您可以让查询返回多个结果集：

SELECT -- query 1

SELECT -- query 2

然后您的客户端可以独立读取2个结果集 - 它取决于您使用的语言，但在使用SqlDataReader的C＃中使用NextResult

SqlDataReader reader = GetReader();
while (reader.Read())
{
    // Process result of query 1
}
reader.NextResult();
while (reader.Read())
{
    // Process result of query 2
}

合并2个SQL查询

4 个答案: