What does the SQL command 'GROUP BY' do?Groups rows that have identical values into summary rowsSorts the data in ascending orderFilter rows based on specified conditionsPerforms arithmetic calculations on numeric columns
Question
What does the SQL command 'GROUP BY' do?Groups rows that have identical values into summary rowsSorts the data in ascending orderFilter rows based on specified conditionsPerforms arithmetic calculations on numeric columns
Solution
The SQL command 'GROUP BY' is used to group rows that have identical values in specified columns into aggregated data, like sum, average, or count. It is often used with aggregate functions (COUNT, MAX, MIN, SUM, AVG) to group the result-set by one or more columns.
Here is a step-by-step explanation of how it works:
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First, the 'GROUP BY' statement groups the selected rows on the distinct values of the column on which you have applied 'GROUP BY'.
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Then, it applies the aggregate functions to each group of the selected rows.
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Finally, it returns a single result row for each group.
Please note that 'GROUP BY' does not sort data, filter rows, or perform arithmetic calculations on numeric columns. It is specifically used for grouping identical data.
Similar Questions
What is the purpose of the GROUP BY clause in SQL?OptionsTo filter rows based on a specified conditionTo group rows based on a common attributeTo join two or more tablesTo sort the result set in ascending order
What does the GROUP BY clause in SQL achieve?Sorts data in ascending or descending order.Groups rows based on a specified column, allowing for aggregate functions.pen_sparkFilters rows based on a specific condition.Selects specific columns from a table.
What is the purpose of the SQL GROUP BY clause?OptionsTo join two or more tablesTo sort rows in a tableTo filter rows from a tableTo group rows with the same values into summary rows
What does the GROUP BY statement do in SQL?Groups rows that have the same values in specified columns into aggregated dataGroups tables that have the same columnsGroups database users that have the same privilegesNone of the above
What is the purpose of the ORDER BY clause in an SQL statement?To filter records based on specified conditions To sort the retrieved dataTo group recordsTo limit the number of records retrieved
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