如何加入一個查詢到另一個查詢

我有兩個疑問，我想加入與SQL第二，這裏是我的查詢第一個查詢，如何加入一個查詢到另一個查詢

第一個查詢

OleDbCommand Query1 = new OleDbCommand(); 
Query.CommandText = "SELECT [Mastertable].ID " + 
"FROM [Mastertable] INNER JOIN [relationship] ON [Mastertable].ID = [relationship].SW1_ID " + 
"WHERE ([Mastertable].[PN]= @PN AND [Mastertable].[Ver][email protected]) " + 
"GROUP BY [Mastertable].[ID]"; 

DataSet ResultSet = RunQuery(Query1);

以上查詢基本恢復，其中PN = PN輸入和版本=版本的輸入。（我把結果數據集中

我想從QUERY1加入ID列再次

第二查詢Mastertable。ID的ID，

OleDbCommand Query2 = new OleDbCommand(); 
Query2.CommandText = "SELECT [Mastertable].PN, [Mastertable].[Ver], [relationship].[Category], [Mastertable].[Component_Name] " + 
"FROM (Query1 INNER JOIN [relationship] ON Query1.[ID] = [relationship].SID) INNER JOIN " + 
"[Mastertable] ON [relationship].SW2_ID = [Mastertable].[ID]"; 

DataSet ResultSet2 = RunQuery(Query2);

但這段代碼不起作用，我在網上搜索了很多，並嘗試了一些，但他們沒有幫助。我想用ResultSet1.Tables [0] .TableName和ResultSet1.Tables [0] .Columns [0] .name和但沒有工作=（

請幫

來源

2014-02-07 DaveZ

我認爲最好只使用一個查詢。 SQL是加入數據的最佳位置。 – AFetter

解決！感謝大家！ = D – DaveZ

OleDbCommand Query2 = new OleDbCommand(); 
Query2.CommandText = "SELECT [SW Mastertable].SW_PN, [SW Mastertable].[SW_Ver], [SW relationship].[SW2_Category]," + 
" [SW Mastertable].[Component_Name] " + 
" FROM " + 
"(SELECT [Mastertable].ID as ID " + 
"FROM [Mastertable] INNER JOIN [relationship] ON [Mastertable].ID = [relationship].SW1_ID " + 
"WHERE ([Mastertable].[PN]= @PN AND [Mastertable].[Ver][email protected]) " + 
"GROUP BY [Mastertable].[ID]) as Query1 " + 
" INNER JOIN [SW relationship] ON Query1.[ID] = [SW relationship].SW1_ID INNER JOIN " + 
"[SW Mastertable] ON [SW relationship].SW2_ID = [SW Mastertable].[ID]"; 

DataSet ResultSet2 = RunQuery(Query2);

來源

2014-02-07 05:11:56 jainvikram444

是的！非常感謝！有效。感謝您向我展示如何使用AS Query1 – DaveZ

你可以加入查詢1到第二（外）QUERY2作爲派生表如下：

SELECT [SW Mastertable].SW_PN, [SW Mastertable].[SW_Ver], 
     [SW relationship].[SW2_Category], [SW Mastertable].[Component_Name] 
FROM 
    (SELECT [Mastertable].ID 
    FROM [Mastertable] 
     INNER JOIN [relationship] ON [Mastertable].ID = [relationship].SW1_ID 
    WHERE ([Mastertable].[PN]= @PN AND [Mastertable].[Ver][email protected]) 
    GROUP BY [Mastertable].[ID] 
) Query1 
    INNER JOIN [SW relationship] ON Query1.[ID] = [SW relationship].SW1_ID) 
    INNER JOIN [SW Mastertable] ON [SW relationship].SW2_ID = [SW Mastertable].[ID];

如果您正在使用sql-server你也可以做到這一點的CTE：

WITH Query1 AS 
(
    SELECT [Mastertable].ID 
    FROM [Mastertable] 
     INNER JOIN [relationship] ON [Mastertable].ID = [relationship].SW1_ID 
    WHERE ([Mastertable].[PN]= @PN AND [Mastertable].[Ver][email protected]) 
    GROUP BY [Mastertable].[ID] 
) 
SELECT [SW Mastertable].SW_PN, [SW Mastertable].[SW_Ver], 
     [SW relationship].[SW2_Category], [SW Mastertable].[Component_Name] 
FROM 
    Query1 
    INNER JOIN [SW relationship] ON Query1.[ID] = [SW relationship].SW1_ID) 
    INNER JOIN [SW Mastertable] ON [SW relationship].SW2_ID = [SW Mastertable].[ID];

來源

2014-02-07 05:00:51 StuartLC

這是SQL。操作正在使用asp.net –

OP明確指出'加入第一個查詢與第二個SQL' – StuartLC

我添加了「AS Query1 INNER JOIN [SW Relation]」而不是「Query1 INNER JOIN [SW Relation]」並且它工作正常！謝謝 – DaveZ

不是很確定這是否會工作但你仍然可以試試看。如果有的話，請修復語法錯誤。

此外，我假設你有Query1對象可用（即不是空或不超出範圍），同時嘗試創建Query2對象。

OleDbCommand Query2 = new OleDbCommand(); 
Query2.CommandText = "SELECT [SW Mastertable].SW_PN, [SW Mastertable].[SW_Ver], [SW relationship].[SW2_Category], [SW Mastertable].[Component_Name], [SW relationship].SW2_ID " + 
"FROM (("+ Query1.CommandText +")TAB1 INNER JOIN [SW relationship] ON TAB1.[ID] = [SW relationship].SW1_ID) TAB2 INNER JOIN " + 
"[SW Mastertable] ON [TAB2].SW2_ID = [SW Mastertable].[ID]"; 

DataSet ResultSet2 = RunQuery(Query2);

希望這會有所幫助。

來源

2014-02-07 05:02:49 samar

如何加入一個查詢到另一個查詢

回答

相關問題