Question

I have like 10 diff temporary tables created in SQL server, what I am looking to do is union them all to a final temporary table holding them all on one table. All the tables have only one row and look pretty much exactly like the two temp tables below.

Here is what I have so far this is an example of just two of the temp tables as their all exactly like this one then #final is the table I want to union the all to:

      create table #lo
      (
         mnbr bigint
      )
      insert into #login (mnbr)
      select distinct (_ID)
      FROM [KDB].[am_LOGS].[dbo].[_LOG] 
      WHERE time >= '2012-7-26 9:00:00

       Select count(*) as countreject
       from #lo

     create table #pffblo
     (
       mber_br
     )
     insert into #pffblo (mber_br)
     select distinct (mber_br)
     from individ ip with (nolock)
     join memb mp with (nolock)
          on( ip.i_id=mp.i_id and mp.p_type=101) 
      where ip.times >= '2012-9-26 11:00:00.000'

     select count(*) as countaccept

    create table #final
    (
        countreject bigint
        , Countacceptbigint
        .....
    )

    insert into #final (Countreject, Countaccept....more rows here...)
    select Countreject, Countaccept, ...more rows selected from temp tables.
    from #final
    union 
    (select * from #lo)
    union
    (select * from #pffblo)
    select *
    from #final

drop table #lo
drop table #pffblo
drop table #final

if this the form to union the rows form those temp tables to this final one. Then is this correct way to show all those rows that were thus unioned. When I do this union I get message number of columns in union need to match number of columns selected in union

Answer 1

I think you’re using a union the wrong way. A union is used when you have to datasets that are the same structure and you want to put them into one dataset.

e.g.:

CREATE TABLE #Table1
(
  col1 BIGINT
)

CREATE TABLE #Table2
(
  col1 BIGINT
)

--populate the temporary tables

CREATE TABLE #Final
(
  col1 BIGINT
)

INSERT INTO #Final (col1)
SELECT *
FROM #Table1
UNION
SELECT *
FROM #Table2

drop table #table1
drop table #table2
drop table #Final

I think what you’re trying to do is get 1 data set with the count of all your tables in it. Union won’t do this.

The easiest way (although not very performant) would be to do select statements like the following:

CREATE TABLE #Table1
(
  col1 BIGINT
)

CREATE TABLE #Table2
(
  col1 BIGINT
)

--populate the temporary tables

CREATE TABLE #Final
(
  col1 BIGINT,
  col2 BIGINT
)




INSERT INTO #Final (col1, col2)
select (SELECT Count(*) FROM #Table1) as a, (SELECT Count(*) FROM #Table2) as b

select * From #Final

drop table #table1
drop table #table2
drop table #Final