如何从 MySQL 表中获取一个或多个列作为输出?
mysqlmysqli database更新于 2025/4/8 5:00:17
SELECT 命令可用于从 MySQL 表中获取一个或多个列作为输出。一个
下面给出了获取一个或多个列的示例
mysql> Select * from Student; +------+---------+---------+-----------+ | Id | Name | Address | Subject | +------+---------+---------+-----------+ | 1 | Gaurav | Delhi | Computers | | 2 | Aarav | Mumbai | History | | 15 | Harshit | Delhi | Commerce | | 17 | Raman | Shimla | Computers | +------+---------+---------+-----------+ 4 rows in set (0.01 sec) mysql> Select Name,Subject from Student; +---------+-----------+ | Name | Subject | +---------+-----------+ | Gaurav | Computers | | Aarav | History | | Harshit | Commerce | | Raman | Computers | +---------+-----------+ 4 rows in set (0.00 sec)
上述查询从‘Student’表中获取‘Name’和‘subject’两列。
mysql> Select Address from Student; +---------+ | Address | +---------+ | Delhi | | Mumbai | | Delhi | | Shimla | +---------+ 4 rows in set (0.00 sec)
上述查询仅从‘Student’表中获取一列‘Address’。
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mysql 参考教程 - 该教程包含有关 mysql 的更多信息:https://www.cainiaomax.com/mysql/
