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Legal Studies從具有重複列值 (名稱) 的 MySQL 表中獲取特定行？
讓我們首先建立 -
mysql> create table DemoTable1431 -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> EmployeeName varchar(20), -> EmployeeCountryName varchar(20) -> ); Query OK, 0 rows affected (0.62 sec)
使用插入在表中插入一些記錄 -
mysql> insert into DemoTable1431(EmployeeName,EmployeeCountryName) values('Adam Smith','AUS');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable1431(EmployeeName,EmployeeCountryName) values('Chris Brown','US');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1431(EmployeeName,EmployeeCountryName) values('John Doe','UK');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1431(EmployeeName,EmployeeCountryName) values('Chris Brown','AUS');
Query OK, 1 row affected (0.17 sec)使用選擇從表中顯示所有記錄 -
mysql> select * from DemoTable1431;
這將產生以下輸出 -
+------------+--------------+---------------------+ | EmployeeId | EmployeeName | EmployeeCountryName | +------------+--------------+---------------------+ | 1 | Adam Smith | AUS | | 2 | Chris Brown | US | | 3 | John Doe | UK | | 4 | Chris Brown | AUS | +------------+--------------+---------------------+ 4 rows in set (0.00 sec)
以下是對具有重複列值 MySQL 表中獲取特定行查詢 -
mysql> select * from DemoTable1431 where EmployeeName='Chris Brown' and EmployeeCountryName='AUS';
這將產生以下輸出 -
+------------+--------------+---------------------+ | EmployeeId | EmployeeName | EmployeeCountryName | +------------+--------------+---------------------+ | 4 | Chris Brown | AUS | +------------+--------------+---------------------+ 1 row in set (0.00 sec)
更新於： 12年-11月-2019
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