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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I am Arjun from Hyderabad (India). I have been working as a software engineer from the last 7+ years, and it is my passion to learn new things and implement them as a practice. Aside from work, I like gardening and spending time with pets.