Question

Table 1 - Deal ID, REF NOS, Type, Papa ID

Table 2 - Deal ID, Type

在名为Method的新视图中创建列。该字段的设置方式如下（4个条件）;

If Deal ID from table 1 Exists in Table 2 and Type is not Null from Table 2. 
Set Method used to be Y

If Deal ID does not exist in Table 1 and Type does not contain 27,42 or 55 in Table 1.
Set Method used to be Y

If Papa ID is null from Table 1, and Type does not contain 27,42 or 55 in Table 1.
Set Method used to be Y

Else 

Set to N

开始并想到哇！..

create view Master as ( 

select Deal ID, REF NOS, Type, Papa ID

[Method used]=
        Case
            When


from Table 1 A 
)

Answer 1

这样的事情可能有用（假设这些表加入DealId）。请注意，我已从您在问题中显示的某些列名中删除了空格。

鉴于这些表格：

CREATE TABLE #Table1 (DealId INT, RefNos VARCHAR(100), [Type] VARCHAR(100), PapaId INT);
CREATE TABLE #Table2 (DealId INT, [Type] VARCHAR(100));

查看示例：

WITH DealIds AS (
    SELECT DealId FROM #Table1
    UNION 
    SELECT DealId FROM #Table2
)
SELECT 
CASE 
    -- If Deal ID from table 1 Exists in Table 2 and Type is not Null from Table 2. 
    -- Set Method used to be Y
    WHEN t1.DealId IS NOT NULL AND t2.DealId IS NOT NULL AND t2.[Type] IS NOT NULL THEN 'Y'

    -- If Deal ID does not exist in Table 1 and Type does not contain 27,42 or 55 in Table 1.
    -- Set Method used to be Y
    -- Note: it is is redundant to have the type condition if DealId is the PK.
    WHEN t1.DealId IS NULL AND t1.[Type] NOT IN (27, 42, 55) THEN 'Y'

    -- If Papa ID is null from Table 1, and Type does not contain 27,42 or 55 in Table 1.
    -- Set Method used to be Y
    WHEN t1.PapaId IS NULL AND t1.[Type] NOT IN (27,42, 55) THEN 'Y'

    -- Else 
    -- Set to N
    ELSE 'N' 
END AS MethodUsed 
FROM DealIds d
LEFT JOIN #Table1 t1 ON d.DealId = t1.DealId
LEFT JOIN #Table2 t2 ON d.DealId = t2.DealId

梦魇案例陈述援助pl

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