MySQL 如何从SELECT查询中获取特定列记录

让我们首先创建一个表 –

mysql> create table DemoTable1837
     (
     StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
     StudentName varchar(20)
     );
Query OK, 0 rows affected (0.00 sec)

使用插入命令在表中插入一些记录 –

mysql> insert into DemoTable1837(StudentName) values('Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1837(StudentName) values('David');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1837(StudentName) values('Bob');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1837(StudentName) values('Mike');
Query OK, 1 row affected (0.00 sec)

使用select语句从表中显示所有记录 –

mysql> select * from DemoTable1837;

这将产生以下输出 –

+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
|         1 | Chris       |
|         2 | David       |
|         3 | Bob         |
|         4 | Mike        |
+-----------+-------------+
4 rows in set (0.00 sec)

以下是获取特定列记录的查询：

mysql> select StudentName from DemoTable1837;

这将产生以下输出 –

+-------------+
| StudentName |
+-------------+
| Chris       |
| David       |
| Bob         |
| Mike        |
+-------------+
4 rows in set (0.00 sec)

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