MySQL With Handling Duplicates ?

This post explains, how to prevent the duplicate occurrence in the table and how to deal with already existed duplicate records.

we can private duplicate record occurrence in the table with the use of primary key and Unique Key Index on appropriate filed.

Displaying Different Values(only once):
The DISTINCT keyword is used for displaying different values from the duplicate values. instead of DISTINCT we can use GROUP BY, it selects only unique Combination


Counting Duplicate Occurrences in the Table


Removing duplicate entries FROM the table

We can also remove duplicate entries without altering table in the following way, FIRST create a temp table with unique id values, then run the delete command where ids are not on the temp table.

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