![]() ![]() If you’ve you’ve set up your constraints properly then you will be unable to delete duplicate rows from a table that is referenced by another table, using the above techniques unless you have specified cascading deletes in the foreign key constraints. Tables that are referenced by a Foreign Key If your table has a primary key, but no foreign key constraints, then the following solution offers a way to remove duplicates that is much quicker, as it entails less iteration: Tables with a primary key, but no foreign key constraints If there is a key, and there are foreign keys referencing the rows that are identified as being duplicates, then the foreign key constraints need to be dropped and re-created again during the table swap. Note that this solution is usually used on table that has no primary key. However, it works well for non-textual schema objects, such as tables. #Duplicate entry for valentina studio updateThe s p_Rename command is an absolutely horrible way of renaming textual objects, such as stored procedures, because it does not update all the system tables consistently. one that lives in the temporary database), because we need the table to exist in the current database, so that it can later be renamed, using sp_Rename. However, it is not a true temporary table (i.e. ![]() This is a temporary table in the sense that we will use it to temporarily store the unique rows. ![]() These rows are immediately inserted into a table named tempTable. In this solution, the SELECT DISTINCT will select all the rows from our table except for the duplicates. Removing Duplicates from a Table in SQL Server - Simple Talk Skip to contentĮxec sp_rename 'tempTable', 'duplicateTable3' ![]()
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