Question

Not sure how to ask this as I’m a bit of a database noob,

What I want to do is the following.

table tb_Company
table tb_Division

I want to return companies that have more than one division and I don’t know how to do the where clause.

SELECT   dbo.tb_Company.CompanyID, dbo.tb_Company.CompanyName, 
dbo.tb_Division.DivisionName FROM dbo.tb_Company INNER JOIN dbo.tb_Division ON 
dbo.tb_Company.CompanyID = dbo.tb_Division.DivisionCompanyID

Any help or links much appreciated.

Answer 1

You’ll need another JOIN where you only return companies having more than one division by using a GROUP BYand a HAVINGclause.

You can read up on grouping here

Groups a selected set of rows into a
set of summary rows by the values of
one or morecolumns or expressions. One
row is returned for each group.
Aggregate functions in the SELECT
clause list provide
information about each group instead
of individual rows.

SELECT   dbo.tb_Company.CompanyID
        , dbo.tb_Company.CompanyName
        , dbo.tb_Division.DivisionName 
FROM    dbo.tb_Company 
        INNER JOIN dbo.tb_Division ON dbo.tb_Company.CompanyID = dbo.tb_Division.DivisionCompanyID
        INNER JOIN (
          SELECT  DivisionCompanyID
          FROM    dbo.tb_Division
          GROUP BY
                  DivisionCompanyID
          HAVING  COUNT(*) > 1
        ) d ON d.DivisionCompanyID = dbo.tb_Company.CompanyID