Sql相交條件

我想知道我們是否可以做相交條件。 theres是somes查詢，但結果是錯誤的（總是空的）。我寫了它應該產生的結果。Sql相交條件

DECLARE @CAN_USE_TABLE1 BIT 
DECLARE @CAN_USE_TABLE2 BIT 
DECLARE @CAN_USE_TABLE3 BIT 
DECLARE @CAN_USE_TABLE4 BIT 

DECLARE @TABLE1 AS TABLE (ABC INT) -- values will be 1,2,3 
DECLARE @TABLE2 AS TABLE (ABC INT) -- values will be 1,2 
DECLARE @TABLE3 AS TABLE (ABC INT) --EMPTY TABLE 
DECLARE @TABLE4 AS TABLE (ABC INT) --EMPTY TABLE 
INSERT INTO @TABLE1 VALUES (1) 
INSERT INTO @TABLE1 VALUES (2) 
INSERT INTO @TABLE1 VALUES (3) 
INSERT INTO @TABLE2 VALUES (1) 
INSERT INTO @TABLE2 VALUES (2) 

SET @CAN_USE_TABLE1 = 1 
SET @CAN_USE_TABLE2 = 1 
SET @CAN_USE_TABLE3 = 1 
SET @CAN_USE_TABLE4 = 0 

SELECT ABC FROM @TABLE1 WHERE @CAN_USE_TABLE1 = 1 
INTERSECT 
SELECT ABC FROM @TABLE2 WHERE @CAN_USE_TABLE2 = 1 
INTERSECT 
SELECT ABC FROM @TABLE3 WHERE @CAN_USE_TABLE3 = 1 
INTERSECT 
SELECT ABC FROM @TABLE4 WHERE @CAN_USE_TABLE4 = 1 

--RESULT SHOULD BE : 
-- NO RESULT 
-- 
-- BECAUSE, AT THIS STAGE, TABLE1 AND TABLE2 AND TABLE3 SHOULD BE INTERSECTED. AND BECAUSE TABLE3 IS EMPTY, THE RESULT IS EMPTY. 

SET @CAN_USE_TABLE1 = 1 
SET @CAN_USE_TABLE2 = 1 
SET @CAN_USE_TABLE3 = 0 
SET @CAN_USE_TABLE4 = 0 

SELECT ABC FROM @TABLE1 WHERE @CAN_USE_TABLE1 = 1 
INTERSECT 
SELECT ABC FROM @TABLE2 WHERE @CAN_USE_TABLE2 = 1 
INTERSECT 
SELECT ABC FROM @TABLE3 WHERE @CAN_USE_TABLE3 = 1 
INTERSECT 
SELECT ABC FROM @TABLE4 WHERE @CAN_USE_TABLE4 = 1 

--RESULT SHOULD BE : 
-- 1 
-- 2 
-- 
-- BECAUSE, AT THIS STAGE, TABLE1 AND TABLE2 SHOULD BE INTERSECTED 

SET @CAN_USE_TABLE1 = 0 
SET @CAN_USE_TABLE2 = 1 
SET @CAN_USE_TABLE3 = 0 
SET @CAN_USE_TABLE4 = 0 

SELECT ABC FROM @TABLE1 WHERE @CAN_USE_TABLE1 = 1 
INTERSECT 
SELECT ABC FROM @TABLE2 WHERE @CAN_USE_TABLE2 = 1 
INTERSECT 
SELECT ABC FROM @TABLE3 WHERE @CAN_USE_TABLE3 = 1 
INTERSECT 
SELECT ABC FROM @TABLE4 WHERE @CAN_USE_TABLE4 = 1 

--RESULT SHOULD BE : 
-- 1 
-- 2 
-- 
-- BECAUSE, AT THIS STAGE, ONLY TABLE 2 SHOULD BE USED

來源

2012-05-25 forX

您是否在尋找whene他們相關的變量被設置爲0忽略表的相交？ –

是的，那就是我想要的。 – forX

空集INTERSECT版與其他任何一組永遠是空的。這就像由0乘以你總是得到0

條件INTERSECT ING將需要無論是動態查詢，或一個臨時表，就像這樣：

初始化

DECLARE @CAN_USE_TABLE1 BIT 
DECLARE @CAN_USE_TABLE2 BIT 
DECLARE @CAN_USE_TABLE3 BIT 
DECLARE @CAN_USE_TABLE4 BIT 

DECLARE @TABLE1 AS TABLE (ABC INT) 
DECLARE @TABLE2 AS TABLE (ABC INT) 
DECLARE @TABLE3 AS TABLE (ABC INT) 
DECLARE @TABLE4 AS TABLE (ABC INT) 
DECLARE @RESULT AS TABLE (ABC INT) --Adding this result table 
INSERT INTO @TABLE1 VALUES (1) 
INSERT INTO @TABLE1 VALUES (2) 
INSERT INTO @TABLE1 VALUES (3) 
INSERT INTO @TABLE2 VALUES (1) 
INSERT INTO @TABLE2 VALUES (2) 

SET @CAN_USE_TABLE1 = 1 
SET @CAN_USE_TABLE2 = 1 
SET @CAN_USE_TABLE3 = 0 
SET @CAN_USE_TABLE4 = 0

處理

INSERT INTO @RESULT 
SELECT ABC FROM @TABLE1 WHERE @CAN_USE_TABLE1=1 UNION 
SELECT ABC FROM @TABLE2 WHERE @CAN_USE_TABLE2=1 UNION 
SELECT ABC FROM @TABLE3 WHERE @CAN_USE_TABLE3=1 UNION 
SELECT ABC FROM @TABLE4 WHERE @CAN_USE_TABLE4=1 

DELETE r FROM @RESULT r 
WHERE NOT EXISTS(SELECT 1 FROM @TABLE1 WHERE ABC=r.ABC) 
AND @CAN_USE_TABLE1=1; 

DELETE r FROM @RESULT r 
WHERE NOT EXISTS(SELECT 1 FROM @TABLE2 WHERE ABC=r.ABC) 
AND @CAN_USE_TABLE2=1; 

DELETE r FROM @RESULT r 
WHERE NOT EXISTS(SELECT 1 FROM @TABLE3 WHERE ABC=r.ABC) 
AND @CAN_USE_TABLE3=1; 

DELETE r FROM @RESULT r 
WHERE NOT EXISTS(SELECT 1 FROM @TABLE4 WHERE ABC=r.ABC) 
AND @CAN_USE_TABLE4=1; 

SELECT * FROM @RESULT;

結果

1 
2

來源

2012-05-25 20:34:00

delete語句將不會刪除元素「@Result」如果「@ CAN_USE_TABLE1」 = 0你做了一個無條件的工會，但條件刪除 –

坦克你，似乎工作（只是希望不要太貪 – forX

@ anouar204良好的漁獲物。通過將WHERE @CAN_USE_TABLE ...添加到UNION SELECT –

declare @sql nvarchar(4000), 
    @params nvarchar(4000) 

if @can_use_table1 = 1 
    select @sql= 'select abc from @table1' 

if @can_use_table2 = 1 
begin 
    if @can_use_table1 = 1 
     select @sql = @sql + ' intersect ' 
    select @sql = @sql + 'select abc from @table2' 
end 

if @can_use_table3 = 1 
begin 
    if @can_use_table1 = 1 or @can_use_table2 = 1 
     select @sql= @sql + ' intersect '   
    select @sql= @sql + 'select abc from @table3' 
end 

if @can_use_table4 = 1 
begin 
    if @can_use_table1 = 1 or @can_use_table2 = 1 or @can_use_table3 = 1 
     select @sql= @sql + ' intersect ' 
    select @sql= @sql + 'select abc from @table4'  
end 

select @params ='@can_use_table1 bit, @can_use_table2 bit, 
     @can_use_table3 bit, @can_use_table4 bit, 
@table1 table, @table2 table, @table3 table, @table4 table' 

exec sp_executesql @sql,@params, 
     @can_use_table1,@can_use_table2, @can_use_table3, @can_use_table4, 
     @table1, @table2, @table3, @table4

來源

2012-05-25 20:19:59

你可以在一個單一的查詢中做到這一點：

select ABC 
from (SELECT ABC, @CAN_USE_TABLE1 as CanUse1, 0 as CanUse2, 0 as CanUse3, 0 as CanUse4 
     FROM @TABLE1 
     union all 
     SELECT ABC, 0, @CAN_USE_TABLE2, 0, 0 FROM @TABLE2 
     union all 
     SELECT ABC, 0, 0, @CAN_USE_TABLE3, 0 FROM @TABLE3 
     union all 
     SELECT ABC, 0, 0, 0, @CAN_USE_TABLE4 FROM @TABLE4 
    ) t 
group by ABC 
having max(Canuse1) = @CAN_USE_TABLE1 AND 
     max(CanUse2) = @CAN_USE_TABLE2 AND 
     max(CanUse3) = @CAN_USE_TABLE3 And 
     max(CanUse4) = @CAN_USE_TABLE4

來源

2012-05-26 02:09:40

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