I've been searching for awhile now on how to remove duplicates from a
table within an Access db and have found plenty of articles on finding
or deleting duplicates. All I want to do is remove them from within an
SQL query - leaving one of the records behind of course.
I have a mailing list comprised of a union query that gets records from
two separate tables.
I want to be able to run a query that removes one (or more) of the
duplicated addresses within the query but doesn't make any
modifications to the table.
Please help! :)
16  4186 
It doesn't really make sense to say you want to delete duplicate addresses
from a query without modifying a table. A query is just a way of displaying
what's in a table, so anything you delete via a query is deleted from the
table. If you want you could put the results of your unioin query into a new
table (make it a make table query), and then you could remove duplicates
from that table (via a query) without modifying the original tables.
hope that helped
-John
"tyrfboard" <ht*****@gmail. com> wrote in message
news:11******** *************@g 43g2000cwa.goog legroups.com... I've been searching for awhile now on how to remove duplicates from a
table within an Access db and have found plenty of articles on finding
or deleting duplicates. All I want to do is remove them from within an
SQL query - leaving one of the records behind of course.
I have a mailing list comprised of a union query that gets records from
two separate tables.
I want to be able to run a query that removes one (or more) of the
duplicated addresses within the query but doesn't make any
modifications to the table.
Please help! :)
"tyrfboard" <ht*****@gmail. com> wrote in message
news:11******** *************@g 43g2000cwa.goog legroups.com... I've been searching for awhile now on how to remove duplicates from a
table within an Access db and have found plenty of articles on finding
or deleting duplicates. All I want to do is remove them from within an
SQL query - leaving one of the records behind of course.
I have a mailing list comprised of a union query that gets records from
two separate tables.
I want to be able to run a query that removes one (or more) of the
duplicated addresses within the query but doesn't make any
modifications to the table.
Please help! :)
I'm not completely clear on what you are trying to do, but.. A UNION query
will, by default, eliminate duplicate records between the member queries.
If you wanted to include all records, regardless of duplicates, you would
need to use UNION ALL.
If you are getting duplicates from within the member queries, then what you
need is the DISTINCT qualifier.
SELECT DISTINCT
field1, field2, field3
FROM
table1
UNION
SELECT DISTINCT
field1, field2, field3
FROM
table2
This syntax should eliminate all of the duplicates from you query output.
--
Randy Harris
tech at promail dot com
I'm pretty sure I know everything that I can remember.
Thank you for your replies.... let me try to explain what I'm doing and
maybe that will help me get the best of your expert advice.
For example: Lets say I have two tables with names, addresses, etc:
Personal table
Work table
I've got a Union query that merges the fields from Personal and Work
together into one mailing list.
However, there are people who belong on both the personal and work
lists - but I don't want to send mail to those individuals twice.
If each field in these records were exactly the same, then select
distinct would work beautifully. Problem is, the dups might be like
this:
FirstName | LastName | HomeNum | HomeStreet
---------------------------------------------
Jonah | Smith | 1983 | Dovecrest Lane (from work)
Jon | Smith | 1983 | Dovecrest (from personal)
So I would like to have a query that would deselect one of those lines
based on the LastName and HomeNum fields matching up. AND, if
possible, I'd like for the line that is kept to come from the Work
table as that is updated more often.
Is the combination of LastName and HomeNum the criteria that would always
use to determine if the records were duplicates?
--
Randy Harris
tech at promail dot com
I'm pretty sure I know everything that I can remember.
"tyrfboard" <ht*****@gmail. com> wrote in message
news:11******** **************@ f14g2000cwb.goo glegroups.com.. . Thank you for your replies.... let me try to explain what I'm doing and
maybe that will help me get the best of your expert advice.
For example: Lets say I have two tables with names, addresses, etc:
Personal table
Work table
I've got a Union query that merges the fields from Personal and Work
together into one mailing list.
However, there are people who belong on both the personal and work
lists - but I don't want to send mail to those individuals twice.
If each field in these records were exactly the same, then select
distinct would work beautifully. Problem is, the dups might be like
this:
FirstName | LastName | HomeNum | HomeStreet
---------------------------------------------
Jonah | Smith | 1983 | Dovecrest Lane (from work)
Jon | Smith | 1983 | Dovecrest (from personal)
So I would like to have a query that would deselect one of those lines
based on the LastName and HomeNum fields matching up. AND, if
possible, I'd like for the line that is kept to come from the Work
table as that is updated more often.
I don't know what you mean by "In this case". It would be rather easy to
create a query that would do what you are asking for if that were the
criteria.
--
Randy Harris
tech at promail dot com
I'm pretty sure I know everything that I can remember.
"tyrfboard" <ht*****@gmail. com> wrote in message
news:11******** **************@ g14g2000cwa.goo glegroups.com.. . In this case, yes.
Note to all: This message has been posted to at least one other newsgroup.
--
Randy Harris
tech at promail dot com
I'm pretty sure I know everything that I can remember.
"tyrfboard" <ht*****@gmail. com> wrote in message
news:11******** *************@g 43g2000cwa.goog legroups.com... I've been searching for awhile now on how to remove duplicates from a
table within an Access db and have found plenty of articles on finding
or deleting duplicates. All I want to do is remove them from within an
SQL query - leaving one of the records behind of course.
I have a mailing list comprised of a union query that gets records from
two separate tables.
I want to be able to run a query that removes one (or more) of the
duplicated addresses within the query but doesn't make any
modifications to the table.
Please help! :)
Randy,
I meant yes -- I said "in this case" as I might want to change the
criteria at some point.
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