mysql> select count(*),name from student group by name; +----------+---------+ | count(*) | name | +----------+---------+ | 1 | Aarav | | 2 | Gaurav | | 1 | Harshit | +----------+---------+ 3 rows in set (0.00 sec)

上面查詢的結果集顯示了哪個值在列中重復了多少次。在上面的示例中，“Gaurav”在“name”列中重復兩次?？梢詮南旅娴?strong>‘SELECT *’ 查詢中驗證同樣的情況 -

mysql> Select * from Student;

+------+---------+---------+-----------+
| Id   | Name    | Address | Subject   |
+------+---------+---------+-----------+
| 1    | Gaurav  | Delhi   | Computers |
| 2    | Aarav   | Mumbai  | History   |
| 15   | Harshit | Delhi   | Commerce  |
| 20   | Gaurav  | Jaipur  | Computers |
+------+---------+---------+-----------+

4 rows in set (0.00 sec)

以上就是如何借助分組函數 COUNT(*) 和 GROUP BY 子句知道列中某個值的重復次數？的詳細內容。