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Let's start with the GROUP BY clause. You can use this to group values from a column, and, if you wish, perform calculations on that column. Let's look at a simple example:

mysql> SELECT poet,SUM(copies_in_stock) FROM writer GROUP BY poet; +----------------------+----------------------+ | poet | SUM(copies_in_stock) | +----------------------+----------------------+ | Douglas Livingstone | 23 | | Mongane Wally Serote | 13 | +----------------------+----------------------+


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Q: What is grouping in DBMS?
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