To do this, we perform what’s known as a self-join on our table. This connects two or more tables so that their content can be compared side-by-side and any duplicates can be spotted easily.

One way to make sure there are no duplicate entries is by using an INNER JOIN statement. When using a database such as SQL, it is important to avoid having the same information stored multiple times. Eliminating Duplicate Entries in SQL with INNER JOIN Syntax To learn more about SQL, we would suggest that you take an online SQL course. However, if the table does not have such an index, one may choose to utilize the ROW NUMBER() function along with CTE (Common Table Expression), allowing the sorting of data before removing any possible duplicated rows from the said database. If the table has an index unique for each record, you can use it together with self-joins or NOT IN logic to identify and remove duplicates. In SQL Server, there are several ways to delete duplicate records in a table. What Does the Duplicate Record Delete in SQL Imply?ĭeleting duplicate records in SQL is about removing records from a table that show up more than once. Using SQL’s Rank Function to Eliminate Duplicate Rows.How to Delete Duplicates in SQL Using Common Table Expressions (CTE)?.How to Delete Duplicate Rows in SQL with Group By and Having Clause?.Eliminating Duplicate Entries in SQL with INNER JOIN Syntax.What Does the Duplicate Record Delete in SQL Imply?.Human Resource Management Specialization.

Delete duplicate rows in sql