10 Questions
What is the purpose of the GROUP BY clause in SQL?
To get summary data based on one or more groups
Which aggregate functions can be used with the GROUP BY clause?
COUNT(), MAX(), MIN(), SUM(), AVG()
Where should the GROUP BY clause come in relation to the WHERE and HAVING clauses?
After the WHERE clause if present and before the HAVING clause
What kind of result does the GROUP BY clause return?
A single row for each value of the GROUP BY column
Which columns can be included in the SELECT clause when using the GROUP BY clause?
Only the GROUP BY columns
Give an example of when the GROUP BY query would be used in SQL.
The GROUP BY query would be used to count the number of employees in each department, or to get the department wise total salaries.
What are the aggregate functions that must be used with the GROUP BY clause in the SELECT query?
The aggregate functions that must be used with the GROUP BY clause in the SELECT query are COUNT(), MAX(), MIN(), SUM(), AVG(), etc.
What are the characteristics of the GROUP BY clause in SQL?
The GROUP BY clause is used to form groups of records, must come after the WHERE clause if present and before the HAVING clause, and can include one or more columns to form one or more groups based on those columns.
Can columns other than the GROUP BY columns be included in the SELECT clause? If so, how?
No, only the GROUP BY columns can be included in the SELECT clause. To include other columns, use the aggregate functions like COUNT(), MAX(), MIN(), SUM(), AVG() with those columns.
Explain the purpose of the GROUP BY clause in SQL.
The purpose of the GROUP BY clause is to get summary data based on one or more groups, where the groups can be formed on one or more columns. It returns a single row for each value of the GROUP BY column.
Test your knowledge of the GROUP BY clause in SQL with this quiz. Understand how to use aggregate functions and form groups based on one or more columns to get summary data.
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