Delete Duplicate Records Based On Two Columns

Jan 3, 2017. Use a cte and assign row numbers so that all but one for duplicate pairs can be deleted. with rownums as (select m.*, row_number().

Retrieving Records from Multiple Tables. It does no good to put records in a database unless you retrieve them eventually and do something with them.

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Jun 24, 2011. You should be able to do a correlated subquery to delete the data. Find all rows that are duplicates and delete all but the one with the smallest.

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mysql – Find and remove duplicate rows by two columns – Stack. – Jan 15, 2013. The best way to delete duplicate rows by multiple columns is the simplest one: Add an UNIQUE index: ALTER IGNORE TABLE your_table ADD.

Jul 23, 2012. This shows the rows you want to keep: ;WITH x AS ( SELECT col1, col2, col3, rn = ROW_NUMBER() OVER (PARTITION BY col1, col2, col3.

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May 14, 2015. Sample SQL FIDDLE. 1) Use CTE to get max ship code value record based on ARDivisionNo, CustomerNo for each Customers WITH cte AS.

I'd suggest that you make a compound PK out of the two columns and not have an 'id' field. But as you're already on this path, DELETE t1.