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What is the purpose of the 'GROUP BY' clause in SQL?

Practice Questions

Q1
What is the purpose of the 'GROUP BY' clause in SQL?
  1. To sort the result set
  2. To aggregate data across multiple records
  3. To filter records
  4. To join multiple tables

Questions & Step-by-Step Solutions

What is the purpose of the 'GROUP BY' clause in SQL?
  • Step 1: Understand that 'GROUP BY' is a SQL command used to organize data into groups.
  • Step 2: Know that it is often used with aggregate functions like COUNT (to count items), SUM (to add numbers), and AVG (to find the average).
  • Step 3: Realize that 'GROUP BY' helps to summarize data, making it easier to analyze large sets of information.
  • Step 4: Remember that you use 'GROUP BY' after the 'FROM' clause in a SQL query.
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