Question

第一个SQL查询（总记忆）

SELECT 
Nodes.NodeID AS NodeID,  Nodes.TotalMemory AS TotalMemory, Nodes.Caption AS NodeName
 FROM 
(Nodes INNER JOIN Volumes ON (Nodes.NodeID = Volumes.NodeID))

第二个SQL查询（节点上的CPU数量）

SELECT N.Caption, COUNT(DISTINCT CPUIndex)

FROM CPUMultiLoad_Detail CPU WITH(NOLOCK)

JOIN Nodes N ON CPU.NodeID = N.NodeID

GROUP BY
N.Caption
Order By
N.Caption

我想加入第一个查询和第二个查询，所以我在同一个表中同时拥有总内存和CPU数量。我如何加入这两个查询？我们可以使用公共密钥Nodes.NodeID加入，但如何？

Answer 1

在一般情况下，只需使用连接和CTE

WITH PartOne AS
(
  SELECT N.NodeID, COUNT(DISTINCT CPU.Index) as [Count]
  FROM CPUMultiLoad_Detail CPU WITH(NOLOCK)
  JOIN Nodes N ON CPU.NodeID = N.NodeID
  GROUP BY N.Caption
)
SELECT Nodes.NodeID 
       Nodes.TotalMemory , 
       Nodes.Caption AS NodeName,
       PartOne.[Count]
FROM Nodes 
INNER JOIN Volumes ON Nodes.NodeID = Volumes.NodeID
JOIN PartOne ON PartOne.NodeID = Nodes.NodeID

这种特殊情况也可以在一个查询中完成：

SELECT Nodes.NodeID 
       Nodes.TotalMemory , 
       Nodes.Caption AS NodeName,
       COUNT(DISTINCT CPU.Index) OVER (PARTITION BY Nodes.Caption ORDER BY Nodes.Caption) AS [Count]
FROM Nodes 
JOIN Volumes ON Nodes.NodeID = Volumes.NodeID
JOIN CPUMultiLoad_Detail CPU ON  CPU.NodeID = Nodes.NodeID

Answer 2

对于相同的情况，我使用了临时表

SELECT ..... FROM .... INTO＃Temp1

GO

SELECT ..... FROM .... INTO＃Temp2

GO

SELECT ..... FROM＃Temp1，＃Temp2 WHERE＃Temp1.NodeID =＃Temp2.NodeID

请记住像这样删除临时表：

DROP表＃Temp1 DROP表＃Temp2

Answer 3

“使用”有助于提供干净的查询：

    WITH CPUOnNodes AS (    
       SELECT N.NodeID, N.Caption, COUNT(DISTINCT CPUIndex)
       FROM CPUMultiLoad_Detail CPU WITH(NOLOCK)
       JOIN Nodes N ON CPU.NodeID = N.NodeID
       GROUP BY N.NodeID, N.Caption
       Order By N.Caption
    )
    SELECT N.NodeID, N.TotalMemory, N.Caption NodeName
    FROM Nodes N 
    INNER JOIN Volumes V ON N.NodeID = V.NodeID
    INNER JOIN CPUOnNodes C ON N.NodeID = C.NodeID

Answer 4

SELECT t1.col2,t2.col3 FROM (SELECT NodeID col1,TotalMemory col2,Caption col3 FROM Nodes)t1 join
(SELECT NodeID col1,Caption col2,COUNT(DISTINCT CPUIndex) col3 FROM CPUMultiLoad_Detail CPU WITH(NOLOCK) GROUP BY Caption Order By Caption)t2 ON t1.col1=t2.col1

SQL加入两个查询结果

4 个答案: