IF EXISTS Logic

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IF EXISTS Logic

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Minnu

Posted Monday, December 03, 2012 1:01 AM

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Group: General Forum Members
Last Login: Yesterday @ 7:30 AM
Points: 124, Visits: 371

Hi Team,

I am having a temp Table "@Temp_Table" and a physical Table "St_Value"

@Temp_Table Contains
Case1:
Column_Name | Value
------------------------------
Col1 123
Col2 NULL

"St_value" Contains
Column_Name | Value
-------------------------------
Col1 123
Col2 582
Col3

My Query is :
if @temp_table contains Col1 and its value then

select "col1 : 123"

for record col2 there is no value (NULL) then
only the column lable should be include.

select "Col1 :123,
Col2 :"

then for remaining records it should check in "St_value" table

Final string should be

select "Col1 :123,
Col2 :
Col3 :456"

Exact Requirement :If temp table contains label "column_name" and its "value" then only Column_Name : Value should be included
else only column_name should be included, for remaining records it should check in physical table.

am using below logic, but its not working.

Please help..

SELECT @query1 =
IF EXISTS (SELECT col1 from @Temp_Table)THEN
'Col1: ' +rtrim(Col1) + ' (Value ' + rtrim(convert(varchar, Value,107)) + ')' +CHAR(10)

ELSE
'Col1: ' ' Value : '

ELSE
CASE WHEN Col1 IS NULL or Col1 = '' THEN ''

ELSE CASE WHEN Value IS null then
'Col1: ' + rtrim(Col1) +CHAR(10)
ELSE 'Col1: ' +rtrim(Col1) + ' (Expires ' + rtrim(convert(varchar, Value,107)) + ')' +CHAR(10)
END
END+

from St_Value

Please Help...?

Post #1391794

Eugene Elutin

Posted Monday, December 03, 2012 2:36 AM

SSCrazy

Group: General Forum Members
Last Login: Yesterday @ 10:39 AM
Points: 2,556, Visits: 4,398

Why are you trying to use dynamic sql. It's look like you need full outer join:

SELECT ISNULL(t.Column_Name, v.Column_Name) AS Column_Name
           ,CASE WHEN  t.Column_Name IS NULL THEN v.Value
                     ELSE t.Value
            END AS Value
FROM   @Temp_Table t
FULL OUTER JOIN St_Value v 
ON v.Column_Name	= t.Column_Name

_____________________________________________
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Post #1391817

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