Question

我已经找到了一些提取我想要的数据的查询，但我似乎无法把它们放在一起。我想将所有信息都放在一张表中。

SELECT MarketIdentifier, CurveType, VintageYear, Rate = Avg(RateValue) FROM #RateCurves GROUP BY MarketIdentifier, CurveType, VintageYear ORDER BY MarketIdentifier, CurveType, VintageYear

SELECT MarketIdentifier, CurveType, VintageYear, Obligation = Avg(ObligationValue) FROM #ObligationCurves GROUP BY MarketIdentifier, CurveType, VintageYear ORDER BY MarketIdentifier, CurveType, VintageYear

以上两个select语句产生两个不同的表，一个包含以下标题：

MarketIdentifier, CurveType, VintageYear, Rate

另一个：

MarketIdentifier, CurveType, VintageYear, Obligation

我只想输出：

MarketIdentifier, CurveType, VintageYear, Obligation, Rate

我尝试过JOIN，UNION，UNION ALL等多种不同的组合。其中一些组合会产生所需的表格格式但值不正确。我确信这是我非常缺乏的基础。

Answer 1

你需要在两个句子中都有相同的字段。试试吧：

SELECT MarketIdentifier, CurveType, VintageYear, NULL as Obligation , Rate = Avg(RateValue) 
FROM #RateCurves 
GROUP BY MarketIdentifier, CurveType, VintageYear 
ORDER BY MarketIdentifier, CurveType, VintageYear
UNION
SELECT MarketIdentifier, CurveType, VintageYear, Obligation = Avg(ObligationValue), NULL as Rate
FROM #ObligationCurves 
GROUP BY MarketIdentifier, CurveType, VintageYear 
ORDER BY MarketIdentifier, CurveType, VintageYear;

Answer 2

一种方法是将group by结果放在派生表t1和t2中，然后按照您要分组的列加入。

下面的查询假设两个查询每个（MarketIdentifier，CurveType，VintageYear）组合都有1行。即，不会有（MarketIdentifier，CurveType，VintageYear）在一个表中但不在另一个表中。否则，您必须根据所需的行进行左连接或完全连接。

select * from (
    your first query here
) t1 inner join (
    your second query here
) t2 on t2.MarketIdentifier = t1.MarketIdentifier
and t2.CurveType = t1.CurveType
and t2.VintageYear = t1.VintageYear

基本联盟或加入

2 个答案: