在同一张表上执行联合

Question

我确定我只是在搜索错误的查询，所以如果有的话，请随时指出我的重复。

我有一张桌子;
项目
idProject |名称| Number |状态| DateRaised

我想什么做的，是能够看到的募集项目的数量，赢了，输了，等

我以为是我能与工会做到这一点，像这样;

SELECT 
CONVERT(nvarchar, DATEPART(YEAR, DateRaised),107) AS [Year], 
COUNT(*) AS [Tenders Received], 
'' AS [Tenders Won], 
NULL AS [Tenders Lost], 
NULL AS [Tenders Pending], 
FROM Projects P 
GROUP BY DATEPART(YEAR, DateRaised) 

UNION 

SELECT 
CONVERT(nvarchar, DATEPART(YEAR, DateRaised),107) AS [Year], 
'' AS [Tenders Received], 
COUNT(*) AS [Tenders Won], 
NULL AS [Tenders Lost], 
NULL AS [Tenders Pending], 
FROM Projects P 
WHERE P.ProjectStatus = 2 
GROUP BY DATEPART(YEAR, DateRaised) 

ORDER BY [YEAR] DESC 

虽然我所得到的是一张两倍大小的桌子。
即

2015 | 10 | NULL | NULL | NULL 
2015 | NULL | 5 | NULL | NULL 

当我其实想是这样的;

2015 | 10 | 5 | NULL | NULL 

也许联合是错误的构造。我现在实际上处于亏损状态。我相当肯定这是我以前做过的，但没有以前的代码工作，我现在完全失去了。

Answer 1

可以使用条件的聚集，而不是UNION：

SELECT 
    DATEPART(YEAR, DateRaised) AS [Year], 
    COUNT(*) AS [Tenders Received], 
    SUM(CASE WHEN P.ProjectStatus = 2 THEN 1 ELSE 0 END) AS [Tenders Won], 
    NULL AS [Tenders Lost], 
    NULL AS [Tenders Pending] 
FROM Projects P 
GROUP BY DATEPART(YEAR, DateRaised) 

---

此外，您可以去除YEAR的CONVERT功能。