Question

我试图在一次调用中获得2组查询，但我似乎无法正确理解。

我打电话的数据是：

每个表的查询是：

SELECT 
    * 
FROM 
    tT 
WHERE 
    active = 1 
    AND ADate BETWEEN '01/03/2011' AND '09/01/2012' 
    AND (RID = 0...etc etc....

AND

SELECT 
    * 
FROM 
    tE 
WHERE 
    active = 1  
    AND  (RID = 0...etc etc...

我尽力将它们结合起来：

SELECT * 
FROM
    (SELECT * 
     FROM tT 
     WHERE active = 1  
       AND ADate BETWEEN '01/03/2011' AND '09/01/2012' 
       AND (RID = 0...etc etc..
JOIN
    (SELECT * 
     FROM tE 
     WHERE active = 1 
       AND (RID = 0...etc etc...  ) ON tT.RID = tE.RId

但是当它应该是（22）的两倍时，它只返回11行。

如何将两者结合起来并获得完整的22行？

Answer 1

如果您只想结合两个查询的结果，只需在两个查询上执行联合。

SELECT * FROM tT WHERE active = 1 AND ADate BETWEEN '01/03/2011' AND '09/01/2012' AND (RID = 0...etc etc..
UNION ALL
SELECT * FROM tE WHERE active = 1 AND (RID = 0...etc etc...

如果您不想包含重复记录，请从union语句中删除“ALL”，并且只返回唯一记录。

Answer 2

如果您只想组合2个表中的数据而不是使用union。

SELECT * 
FROM   tT 
WHERE  active = 1 
AND    ADate BETWEEN '01/03/2011' AND '09/01/2012' 
AND    (RID = 0...etc etc..

UNION ALL

SELECT * 
FROM   tE 
WHERE  active = 1 
AND    (RID = 0...etc etc...

但是，只有当两个表具有完全相同的字段且完全相同的类型时，这才有效。

如果情况并非如此，请选择*但是您应该命名，如果需要，请转换您的字段... 例如:(不知道你的字段，我只是采用了一些随机名称）

SELECT tT.ID, tT.Field1, tT.TypeID
FROM   tT 
WHERE  active = 1 
AND    ADate BETWEEN '01/03/2011' AND '09/01/2012' 
AND    (RID = 0...etc etc..

UNION ALL

SELECT tE.KeyID as ID, tE.Field2 as Field1, convert(int, tE.TypeCode) as TypeID
FROM   tE 
WHERE  active = 1 
AND    (RID = 0...etc etc...

修改
如果两个表都不匹配，则必须更具创意。
例如：
tT具有字段ID int，Field1 int，Field2 varchar（10）和Field3 int
tE具有字段ID int，field4 int，field5 varchar（10）和Field6 datetime

内容将是例如：

tT ID Field1 Field2 Field3 -- ------ ------ ------ 1 30 test 40 tE ID Field4 Field5 Field6 -- ------ ------ ------ 2 50 hello 30/04/2017

结果应该是

ID Field1 Field2 Field3 Field6 -- ------ ------ ------ ------ 1 30 test 40 2 50 hello 30/04/2017

查询不是

SELECT tT.ID, tT.Field1, tT.Field2, tT.Field3, null as Field6 FROM tT WHERE active = 1 AND ADate BETWEEN '01/03/2011' AND '09/01/2012' AND (RID = 0...etc etc.. UNION ALL SELECT tE.KeyID as ID, tE.Field4 as Field1, tE.Field5 as Field2, null as Field3, tE.Field6 FROM tE WHERE active = 1 AND (RID = 0...etc etc...

如果您愿意分享您的桌面设计，我可以进行更符合您需求的查询......

Answer 3

希望这是你想要做的事情

CREATE TABLE #Test(
RowID INT IDENTITY(1,1),
Texts VARCHAR(50)
)
GO

CREATE TABLE #Test1(
RowID INT IDENTITY(1,1),
Numb  INT
)
GO

INSERT INTO #Test VALUES ('Test')
INSERT INTO #Test VALUES ('Best')
GO

INSERT INTO #Test1 VALUES (34)
INSERT INTO #Test1 VALUES (35)
GO

SELECT * FROM 
(SELECT * FROM #Test )T
JOIN
(SELECT * FROM #Test1)T1
ON T.RowID = T1.RowID

Answer 4

如果我在查询后正确理解问题应该有效假设你有 col1＆amp; 表格tT 中的col3 ，而 col1＆amp; table tE 中的col2 然后你应该使用null，就像不存在的列一样

$(function() {

  $('p').click(function(){
        $(this).next('p').show();
  });

});

如果不需要别的东西，请告诉我。

SQL Server：将2个SELECTS与JOIN组合在一起

4 个答案: