Grouping By One Field When Selecting Several

Question:
These are the fields of my table: id, email, firstname, and lastname. There can be multiple records for a single email. I only want to group by email and get a count of how many records have the same email for each group. The fields I need for the report are firstname, lastname, email, and emailcount. If two records have the same email but different firstname or lastname, I only need to see one of them in the recordset.

Answer:
You can use a query with the GROUP BY clause to retrieve a count of columns that contain the same information. For example, assume you have a table with the four columns you specified and four records, two of which have the same e-mail address. This query returns the count of records with the specified e-mail address:

 SELECT Count(*) AS emailcount, email FROM UsersGROUP BY emailemailcount email                     ---------- ----------------------- 2          [email protected]          [email protected]          [email protected]

This query gets a little fancier and groups by the additional columns in the table. Only columns in the GROUP BY clause can be returned in a GROUP BY query.

SELECT Count(*) AS emailcount, email, firstname, lastname FROM UsersGROUP BY email, firstname, lastnameemailcount email                  firstname lastname   ---------- ---------------------- --------- --------2          [email protected]        Anne      Smith1          [email protected]        Jack      Jones1          [email protected] Mary      Murray

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