Question

I need a little bit of help with a subquery inside a storedproc.

I have two tables

Tab1: @WerteTab (WVaNr, WVaBez, WVaVon, WVaBis, WVaOrt)

Tab2: TemplateTab(TempField, ViewField)

Values of TemplateTab are

Counter TempField  ViewField
1       ccVABez    WVaBez
2       ccVAVon    WVaVon
3       ccVaBis    WVaBis

My SQL looks like

SELECT 
    TemplateTab.TempField, 
    (Select TemplateTab.ViewField From @WerteTab) AS Feldwert
FROM 
    TemplateTab

@WerteTab has just one row

So, the value of TemplateTab.ViewField is the columnName of Tab1

When I run the SQL Feldwert has the same values like ViewField

When I replace TemplateTab.ViewField with WVaBez I get the right value from Tab1

Hope somebody can help.

Answer 1

SELECT  tt.TempField
,       case ViewField
        when 'WVaNr' then wt.WVaNr
        when 'WVaBez' then wt.WVaBez
        when 'WVaVon' then wt.WVaVon
        when 'WVaBis' then wt.WVaBis
        when 'WVaOrt' then wt.WVaOrt
        end as Feldwert
FROM    TemplateTab tt
CROSS JOIN
        @WerteTab wt