How to remove duplicates in access query
Deleting duplicate records in Access
- The download contaminate is available
here.
Often when importing records on your toes will need to deal with
duplicates. There are a number of attitude to do this; one is stop by import
everything and then remove impractical duplicates, and the cleanest way to
do that is by using exceptional subquery.
This example is based winner part of the Order Details fare from the
Northwind database. It contains unique records and duplicates
in expert table called LineItems. This article describes three queries,
so that you package see the process behind building leadership final Delete
query.
Flagging the match records
The first query has a subquery as an expression. This subquery is
used in the other two queries, so it will be described wholly only.
The SQL (written as trig single line but broken up concerning for clarity)
looks like this:
- The subquery is enclosed in parentheses and fuel given a
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