Question

我在MSSQL Server中有两个表，如下所示

表1：在Col2中具有逗号分隔值的表

--------------------------------------------------
|   S. No   |   Col1    |   Col2    |   Col3    |
--------------------------------------------------
|   1   |   AAAA    |A2,A1,C2,B2,C1|    X1  |
--------------------------------------------------
|   2   |   BBBB    |   B2  |   X2  |
--------------------------------------------------
|   3   |   CCCC| B2,C2,C1,D1, B1|  X3  |
--------------------------------------------------
|   4   |   DDDD    |   C1  |   X4  |
--------------------------------------------------
|   5   |   EEEE    |C2,C1,D1   |   X5  |
--------------------------------------------------

表2：优先事项列于表2

----------------------------------------
|      Priority |   Col1    |
---------------------------------------- 
|   1   |   D1  |
----------------------------------------
|   2   |   D2  |
----------------------------------------
|   3   |   B1  |
----------------------------------------
|   4   |   C2  |
----------------------------------------
|   5   |   C2  |
----------------------------------------
|   6   |   B2  |
----------------------------------------
|   7   |   A1  |
----------------------------------------
|   8   |   A2  |
----------------------------------------

预期输出：创建第三个表，根据表2中的优先级，输出表应该只具有Col2中的最高优先级值，如下所示

--------------------------------------------------
|   S. No   |   Col1    |   Col2    |   Col3    |
--------------------------------------------------
|   1   |   AAAA    |   C2  |   X1  |
--------------------------------------------------
|   2   |   BBBB    |   B2  |   X2  |
--------------------------------------------------
|   3   |   CCCC    |   D1  |   X3  |
--------------------------------------------------
|   4   |   DDDD    |   C1  |   X4  |
--------------------------------------------------
|   5   |   EEEE    |   D1  |   X5  |
--------------------------------------------------

Answer 1

由于数据已加载到Table_1和Table_2中，因此可以在SELECT语句中使用以下函数来标识具有最高优先级的值。该函数接受一个字符串，将其拆分并根据表2中的优先级返回最高的字符串。如果你想这样做是SSIS，将SELECT嵌入Source组件中。

CREATE FUNCTION fn_GetPriority (@S varchar(max)) 
RETURNS VARCHAR(10)
AS
BEGIN
DECLARE @Split char(1),
        @X xml,
        @Output varchar(10)
DECLARE @Tab AS TABLE(Col1 varchar(50))

SELECT @Split = ','
SELECT @X = CONVERT(xml,' <root> <s>' + REPLACE(@S,@Split,'</s> <s>') + '</s>   </root> ')

INSERT INTO @Tab
SELECT [Value] = T.c.value('.','varchar(20)')
FROM @X.nodes('/root/s') T(c) --AS T1

SELECT @Output = 
(SELECT T3.Col1 AS Col1
FROM Table_2 T3 
JOIN (
        SELECT MAX([Priority]) AS [Priority]
        FROM Table_2 T1 
        JOIN @Tab T2 
            ON T1.Col1 = T2.Col1
    ) AS T4
    ON T3.Priority = T4.Priority 
)

RETURN @Output
END

要插入表3，请使用以下insert语句：

INSERT INTO Table_3 ([S. No], Col1, Col2, Col3)
SELECT [S. No], Col1, [dbo].[fn_GetPriority](Col2), Col3 FROM Table_1

将具有逗号分隔字符串的行与另一个表中的行进行比较，对其进行排序，然后将该行插入第三个表中

1 个答案: