MySQL Distinct question

That query will show all of the distinct rows between all values listed.

If you want to just see the unique PID, you need to just have the columns that you want to be distinct in the select.  If you need to join it back to the source table, you can make it a derived table and join it.

Here is my real life query:

SELECT
    pd.person_id, pd.first,pd.email,sod.option_text
FROM
    pd
INNER JOIN
    srf ON pd.person_key = srf.person_key
INNER JOIN
    ON srf.survey_option_key =  sod.survey_option_key
WHERE
    srf.survey_option_key IN (297,298,299)
AND
    srf.survey_question_key = '43'
AND
    pd.is_subscriber ='1'
ORDER BY
    pd.person_id ASC

Select allOpen in new window

This works fine, except that it returns rows multiple times for pd.person_id. I am not sure how to apply what you suggested to make sure ONLY pd.person_id is distinct. Any idea?

This will do an inner join to just the distinct ID list so they only display once.

SELECT
    pd.person_id, pd.first,pd.email,sod.option_text
FROM
    pd
INNER JOIN
    srf ON pd.person_key = srf.person_key
INNER JOIN
    ON srf.survey_option_key =  sod.survey_option_key
INNER JOIN (SELECT DISTINCT Person_id FROM PD) PDList ON pd.Person_ID = PDList.Person_id
WHERE
    srf.survey_option_key IN (297,298,299)
AND
    srf.survey_question_key = '43'
AND
    pd.is_subscriber ='1'
ORDER BY
    pd.person_id ASC

Select allOpen in new window

thanks - it is running, so i will report back when finished.

Hi lvollmer,

Isn't this enough:

Select  pID, name, address, phone, email from table group by pID, name, address, phone, email

Murphey - woudln't that still show multiple rows for one pID?

I will run it now and test.

In the real query I am running (see second query) the result set will return multiple rows for pd.person_id if they have values for this:

WHERE
    srf.survey_option_key IN (297,298,299)

this worked, thank you. I guess I did not understand how GROUP BY worked, and it is perfect for this instance.

GROUP BY wil select each record that has a unique group by,
if your tabel contains 2 rows with the same pID for 1 person with 2 adresses, the line is shown twice