CODEWITHSUNDEEP
sqlsql-serverstored-proceduresunion
webworm
webworm

Reputation: 11019

UNION the results of multiple stored procedures

I have a stored procedure I need to call several different times passing in different paramaters each time. I would like to collect the results as a single dataset. Is something like this possible ...

exec MyStoredProcedure 1
UNION
exec MyStoredProcedure 2
UNION
exec MyStoredProcedure 3

I tried using the syntax above but got the error ...

Incorrect syntax near the keyword 'UNION'

The stored procedures I am dealing with are pretty complex and sort of a "black box" to me, so I cannot get into the definition of the stored procedure and change anything. Any suggestions on how to gather the results together?

I am using SQL Server 2008 R2. Thanks for any help.

Upvotes: 59

Views: 111960

Answers (5)

Victor Pellicer Climent
Victor Pellicer Climent

Reputation: 1

Hello I had this same issue. I found the solution here If you need to so something like this (this will not work) :

exec test1 'Variable1', 'Variable2';
UNION
exec test2 'Variable1', 'Variable2;

How to do the union of the 2 store procedures:

  1. Create a variable as table.

  2. Define all the columns that will return the store procedure in the variables of the table.

  3. Make the union of the variables. --First variable

    declare @table1 as table ( 
    column1 nvarchar(20) ,   
    column2 nvarchar(30),
    column3 nvarchar(50)   )

--Second variable

  declare @table2 as table ( 
       column1 nvarchar(20) ,   
       column2 nvarchar(30),
       column3 nvarchar(50)  )Insert into @table1

--Input the data returned from the store procedure into the variables

exec test1 'Variable1', 'Variable2';
Insert into @table2
exec test2 'Variable1', 'Variable2';

--Make the union with the variables

   select * from @table1 
    UNION 
   select * from @table2

I hope this post will help the next colleagues that will find this as an issue.

Upvotes: 0

Vikrant Shitole
Vikrant Shitole

Reputation: 514

Here is General query

DECLARE @sql nvarchar(MAX)
DECLARE @sql1 nvarchar(MAX)

set @sql = 'select name from abc'

set @sql1 = 'select name from xyz'

EXECUTE(@sql + ' union all ' + @sql1)

Upvotes: 0

Transact Charlie
Transact Charlie

Reputation: 2203

You can do all of that but think about what you are asking......

You want to pass multiple parameters to the sp and have it produce the same format result set for the different params. So you are, in effect, making a loop and repeatedly calling the stored proc with scalar data.

What you should do is rewrite the sp so that it can take sets of parameters and provide you with a combined result. Then you only do 1 set based operation.

You can pass table variables into an sp in 2008 as long as you make your own type up first.

Upvotes: 4

Ben
Ben

Reputation: 35613

You can use INSERT EXEC for this.

declare @myRetTab table (somcolumn ...)
insert @myRetTab
exec StoredProcName @param1

Then use union on the table variable or variables.

Upvotes: 12

gbn
gbn

Reputation: 432180

You'd have to use a temp table like this. UNION is for SELECTs, not stored procs

CREATE TABLE #foo (bar int ...)

INSERT #foo
exec MyStoredProcedure 1

INSERT #foo
exec MyStoredProcedure 2

INSERT #foo
exec MyStoredProcedure 3

...

And hope the stored procs don't have INSERT..EXEC.. already which can not be nested. Or multiple resultsets. Or several other breaking constructs

Upvotes: 90

Related Questions