Join Two EXEC statements

Question

Hi Team,
I want to join two dynamic sql with a UNION in between
EXEC(@STRSQLNOArchive+' UNION' + @STRSQLArchive) 
But here it is throwing an error .How this can be done
SET @STRSQLNOArchive= 'Select columnname1 from table 1'
SET @STRSQLArchive= 'Select columnname2 from table 2'
Result should be like this
Select columnname1 from table 1
UNION
Select columnname2 from table 2
Thanks,
Divya

Answer 1

this is the query i m using
Declare @FilterTable table
ColumnName varchar(50),
Value varchar(250),
Type varchar(50)
INSERT INTO  @FilterTable(ColumnName,Value,Type)
SELECT
[Table].[Column].value('(@Field)[1]','varchar(250)')  'ColumnName',
[Table].[Column].value('(@Filter)[1]','varchar(250)')  'Value',
[Table].[Column].value('(@Type) [1]','varchar(250)')  'Type'
 FROM @ParamListXML.nodes('/ROOT/Parameter')  [Table]([Column])
-- Select * from @FilterTable
DECLARE @Where varchar(4000);
declare @sql nvarchar(Max);
SELECT
@Where = CASE WHEN ISNULL(@Where,'') = '' THEN '' ELSE @Where + ' AND ' END +'v.'+ColumnName + ' LIKE ''' + Value + ''''
FROM
@FilterTable
WHERE
ISNULL(Value,'') <> ''
DECLARE @STRSQLNOArchive varchar(max)
DECLARE @STRSQLArchive varchar(max)
SET @STRSQLNOArchive = '
SELECT * from 
(SELECT Row_number()Over(Order By V.ProjectId) Rownum,
Colum1,
Colum2,
Colum3,
Colum4,
Colum5,
Colum6,
Colum7,
Colum8
FROM PLanInfoBackup v    
LEFT JOIN Arch_tableBKUP b2 ON v.RefBudgetId = b2.BudgetId    
LEFT JOIN Lookup_TableBKUP d ON b2.LevelDomainId = d.DomainId    
LEFT JOIN ShowBKUP ak ON v.TVSHowID = ak.TVShowID
LEFT JOIN dbo.Status (nolock) bs ON v.BudgetId = bs.BudgetId  
WHERE '+ @where +'
 AND((        
 EXISTS (SELECT ''X'' FROM v_CurrentUser p WHERE v.CompanyId = p.CompanyId AND p.ShowId IS NULL AND p.UserId = '+ CONVERT(varchar(10),@UserId) +' ) OR        
 EXISTS (SELECT ''X'' FROM v_CurrentUser p2 WHERE v.ShowId = p2.howId AND p2.SeasonId = 0 AND p2.UserId =  '+ CONVERT(varchar(10),@UserId) +' ) OR        
 EXISTS (SELECT ''X'' FROM v_CurrentUser p3 WHERE v.ShowId = p3.TVShowId AND v.SeasonDId = p3.SeasonDId AND p3.UserId = '+ CONVERT(varchar(10),@UserId) +' ) OR        
 EXISTS (SELECT ''X'' FROM v_CurrentUser p4 WHERE v.ProId = p4.ProId AND p4.UserId =  '+ CONVERT(varchar(10),@UserId) +' )        
 ) OR '+CONVERT(varchar(10),@UserId)+' = 0) 
 )SearchTest
  where   Rownum < 501 
order by GLCode,  LevelSort, Revision, Scenario '
  --PRINT @STRSQLNOArchive;
 -- EXEC(@STRSQLNOArchive)
 SET @STRSQLArchive = '
 SELECT * from 
( SELECT Row_number()Over(Order By V.ProjectId) Rownum,
Colum1,
Colum2,
Colum3,
Colum4,
Colum5,
Colum6,
Colum7,
Colum8
FROM PLanInfo v      
LEFT JOIN Arch_table b2 ON v.RefBudgetId = b2.BudgetId      
LEFT JOIN Lookup_Table d ON b2.LevelDomainId = d.DomainId      
LEFT JOIN Show ak ON v.TVSHowID = ak.TVShowID
LEFT JOIN dbo.tableStatus (nolock) bs ON v.BudgetId = bs.BudgetId 
WHERE '+ @where +'
AND((        
 EXISTS (SELECT ''X'' FROM v_CurrentUser p WHERE v.CompanyId = p.CompanyId AND p.ShowId IS NULL AND p.UserId = '+ CONVERT(varchar(10),@UserId) +' ) OR        
 EXISTS (SELECT ''X'' FROM v_CurrentUser p2 WHERE v.ShowId = p2.howId AND p2.SeasonId = 0 AND p2.UserId =  '+ CONVERT(varchar(10),@UserId) +' ) OR        
 EXISTS (SELECT ''X'' FROM v_CurrentUser p3 WHERE v.ShowId = p3.TVShowId AND v.SeasonDId = p3.SeasonDId AND p3.UserId = '+ CONVERT(varchar(10),@UserId) +' ) OR        
 EXISTS (SELECT ''X'' FROM v_CurrentUser p4 WHERE v.ProId = p4.ProId AND p4.UserId =  '+ CONVERT(varchar(10),@UserId) +' )        
 ) OR '+CONVERT(varchar(10),@UserId)+' = 0) 
 )SearchTest
  where   Rownum < 501 
order by GLCode,  LevelSort, Revision, Scenario '
--set @sql = @STRSQLNOArchive +char(13)+' UNION '+char(13) + @STRSQLArchive
--print @sql
--Exec sp_executesql @sql
  --SELECT ColumnName,Value
  --From  @FilterTable --where columnname ='WBSProject'
  IF (select '1' from @FilterTable where ColumnName = 'IsArchived' and Value='0') >0
 EXEC(@STRSQLNOArchive)  
 ELSE      
BEGIN  
 --EXEC(@STRSQLArchive)   
 set @sql = @STRSQLNOArchive +char(13)+' UNION '+ char(13) + @STRSQLArchive
 Print @sql
 Exec sp_executesql @sql
-- PRint @STRSQLArchive  
--EXEC(@STRSQLNOArchive+ char(13)+' UNION' +char(13)+ @STRSQLArchive)     
END