Intermediate SQL | Using Rank and Partition By in SQL Server to Deduplicate Data
Intermediate SQL | Using Rank and Partition By in SQL Server to Deduplicate Data
We walk through how to use the rank function in SQL. We walk through several scenarios to show how it works in cases of ties and duplicate records.
You can download the SQL code used in the video here: https://valuedrivenanalytics.com/how-...
If you'd like to run the code alongside the video (not critical) and don’t already have SQL Server Management Studio installed, here is the link to download it: https://learn.microsoft.com/en-us/sql...
If you'd like to learn more about SQL data manipulation, you can check out our intro to SQL training here, which covers selecting data from a data table, creating new columns, joining tables together, and aggregating and grouping data: • SQL Tutorial for Beginners | Stock Market ...
You can watch the training on joins in SQL here: • Join and Union Tables in SQL and Pandas
You can watch the training on subqueries in SQL here: • Mastering Advanced SQL Techniques | Subque...
We hope this video “ranks” high on your list of SQL trainings!
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CHAPTERS:
0:00 How to write a rank statement
2:40 How to create a new database in SQL Server Management Studio
3:25 What is a schema?
5:26 How to drop a table in SQL
5:32 How to create a table in SQL
5:48 How to manually insert records into a SQL table
8:28 How to query all columns and rows from a table in SQL
9:58 How to join tables together in SQL
12:25 Why it’s important to double check analysis
14:02 How to use SQL to check for duplicates in a table
19:00 How to create a rank statement
19:40 What is a window function in SQL?
22:45 How to perform a subquery in SQL
23:35 How to filter rows from right table in SQL on statement
26:30 How a SQL rank statement handles ties
30:15 How to use SQL rank to deduplicate table
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