Select语句中的条件问题

Question

I am getting the problem with following query.

I have four tables:

OBGT - T0
OACT- T1
OBGS - T2
OASC - T3

And my query is:

SELECT *FROM (
SELECT DISTINCT
    concat([Segment_0], '-' , [Segment_1], '-',[Segment_2])  As [AcctCode],
    T1.[AcctName],
    T2.[Name],
    concat(T3.[Code],'-',T3.[Name]),T0.[DebLTotal] AS [ANNUAL BUDGET],
    (SELECT concat(T3.Code , '-', T3.[Name]) where T3.SegmentId = '1') AS [Project],
    (SELECT concat(T3.Code , '-', T3.[Name]) where T3.SegmentId = '2') AS [Distt]
FROM OBGT T0
    INNER JOIN OACT T1 ON T0.[AcctCode] = T1.[AcctCode]
    INNER JOIN OBGS T2 ON T0.[Instance] = T2.[AbsId] 
    INNER JOIN OASC T3 ON (T3.SegmentId = '1' AND T3.Code = [Segment_1])
                       OR (T3.SegmentId = '2' AND T3.Code = [Segment_2])

) AS d

WHERE Distt = '001' So in this query:

• OASC - T3 table have the field SegmentId which have two Id 1 and 2
• OACT - T0 table have two fields Segment_1 (values are matching with SegmentId = 1) and Segment_2 (values arematching with SegmentId = 2).

You can check in the query.

But the problem is coming if I put a condition.

where Project = 100 is working but if the condition is where Project = 100 and Distt = 001 then I get an error:

Msg 207, Level 16, State 1, Line 11
Invalid column name 'Distt'.

Answer 1

Put you original query as a derived table:

select * from
(
SELECT DISTINCT
    concat([Segment_0], '-' , [Segment_1], '-',[Segment_2])  As 'AcctCode',
    T1.[AcctName] as dummyname1,
    T2.[Name]  as dummyname2,
    concat(T3.[Code],'-',T3.[Name]) as dummyname3,
    T0.[DebLTotal] AS 'ANNUAL BUDGET',
    (SELECT concat(T3.Code , '-', T3.[Name]) where T3.SegmentId = '1') AS 'Project',
    (SELECT concat(T3.Code , '-', T3.[Name]) where T3.SegmentId = '2') AS 'Distt'
FROM OBGT T0
INNER JOIN OACT T1
    ON T0.[AcctCode] = T1.[AcctCode]
INNER JOIN OBGS T2
    ON T0.[Instance] = T2.[AbsId] 
INNER JOIN OASC T3
    ON (T3.SegmentId = '1' AND T3.Code = [Segment_1])
    OR (T3.SegmentId = '2' AND T3.Code = [Segment_2])
) dt
where Project = 100 and Distt =001

NOTE : You need to add column names/aliases for each column before you can use it!

Answer 2

In the SELECT clause you have created an expression, you have then created a column alias ie {expression} as [Alias] .

Two things, to fix your problem you should use a derived table (see below), secondly don't use single quotes for column aliases - use square brackets.

SELECT *
FROM (
    SELECT DISTINCT
        concat([Segment_0], '-' , [Segment_1], '-',[Segment_2])  As [AcctCode],
        T1.[AcctName],
        T2.[Name],
        concat(T3.[Code],'-',T3.[Name]),T0.[DebLTotal] AS 'ANNUAL BUDGET',
        (SELECT concat(T3.Code , '-', T3.[Name]) where T3.SegmentId = '1') AS [Project],
        (SELECT concat(T3.Code , '-', T3.[Name]) where T3.SegmentId = '2') AS [Distt]
    FROM OBGT T0
        INNER JOIN OACT T1 ON T0.[AcctCode] = T1.[AcctCode]
        INNER JOIN OBGS T2 ON T0.[Instance] = T2.[AbsId] 
        INNER JOIN OASC T3 ON (T3.SegmentId = '1' AND T3.Code = [Segment_1])
                           OR (T3.SegmentId = '2' AND T3.Code = [Segment_2])

    ) AS d
WHERE Distt = 001

Be aware you might get another issue with your query if those sub-queries on the SELECT clause return more than 1 row! Your query will give another error.

Project works because it's probably a column in one of the tables.