troubleshooting Question

TSQL Expression error Msg 116, Level 16, in subquery

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LeogalFlag for United States of America asked on
Microsoft SQL ServerMicrosoft SQL Server 2008
13 Comments1 Solution2352 ViewsLast Modified:

I am still in the process of learning nested select statements. I have such as statement as shown below that is giving me the error:

Msg 116, Level 16, State 1, Line 7
Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.

If I am reading the error message correctly, the problem lies with the fact that I have two WHEN statements inside the Select statements. I may be wrong. What I am working towards accomplishing is the abliity to find the correct match for the incoming data record to the outgoing data.

There are a few multiples in the incoming data aka  ci.[OCCUPANCY_CD]  and there almost nothing but multiples in the compare/ lookup column that is used to populate output aka oc.[CITI Occupancy CODE].

I have attached a xref table showing the data being used.  The columns are as follows:
Column 1 = the final resulting output
Column 2 = the description of the 1st column
Column 3 = the incoming data from a row in the CI. table.
Column 4= the description of the 3rd column

Can someone help me with the correct syntax please?

   SELECT [CITI Occupancy CODE] ,                        
             WHEN  ci.[OCCUPANCY_CD] IS NULL THEN  '6'
             WHEN ci.[OCCUPANCY_CD]  IS NOT NULL  
                   AND ci.[OCCUPANCY_CD]  = oc.[CITI Occupancy CODE]
                               THEN  oc.[CITI Occupancy CODE]
        END) as [Occupancy Code]
       FROM dbo.[CITI_Occupancy] oc

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