In this video, we see 10 different ways to remove duplicate records in SQL. We look at 2 different scenario for duplicate records in a table and then come up with 10 SQL queries to remove these duplicate data from the database.

Data can be consider as duplicate if all column values are duplicated or if only some of the column values are duplicated. In this video, you will get solution to remove duplicate data for both these scenarios.

The dataset, scripts and SQL Queries used in this video can be downloaded from below link:
https://techtfq.com/blog/howtoremov...

Have an SQL Query? Would you want me to make a video on it? Then do email me your query to [email protected];

Timestamp:
00:00 Intro about duplicate data in SQL
01:22 Explaining Scenario 1 of Duplicate Data
03:02 SOLUTION 1 Delete using Unique Identifier.
07:19 SOLUTION 2 Using SELF join.
12:21 SOLUTION 3 Using Window function.
15:32 SOLUTION 4 Using MIN function. This delete even multiple duplicate records.
19:34 SOLUTION 5 Using backup table.
24:10 SOLUTION 6 Using backup table without dropping the original table.
26:06 Explaining Scenario 2 of Duplicate Data
27:02 SOLUTION 7 Delete using CTID.
30:25 SOLUTION 8 By creating a temporary unique id column.
33:38 SOLUTION 9 By creating a backup table.
35:30 SOLUTION 10 By creating a backup table without dropping the original table.

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