修复MySQL中的错误“从表名中选择ClientId，ClientName，ClientAge”
发生错误的原因是，在“fromtablename”之前，列名的末尾有一个逗号。这是您可能遇到的错误-
mysql> select ClientId,ClientName,ClientAge, from DemoTable1391; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from DemoTable1391' at line 1
若要删除错误，如上，您需要从表格中删除最后一个逗号。让我们首先创建一个-
mysql> create table DemoTable1391 -> ( -> ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ClientName varchar(20), -> ClientAge int -> );
使用insert在表中插入一些记录-
mysql> insert into DemoTable1391(ClientName,ClientAge) values('Chris',21);
mysql> insert into DemoTable1391(ClientName,ClientAge) values('Bob',23);
mysql> insert into DemoTable1391(ClientName,ClientAge) values('David',24);
mysql> insert into DemoTable1391(ClientName,ClientAge) values('Mike',28);使用选择显示表中的所有记录-
mysql> select * from DemoTable1391;
这将产生以下输出-
+----------+------------+-----------+ | ClientId | ClientName | ClientAge | +----------+------------+-----------+ | 1 | Chris | 21 | | 2 | Bob | 23 | | 3 | David | 24 | | 4 | Mike | 28 | +----------+------------+-----------+ 4 rows in set (0.00 sec)
以下是删除错误的查询，即这是使用SELECT语句和提取记录的正确方法-
mysql> select ClientId,ClientName,ClientAge from DemoTable1391;
这将产生以下输出-
+----------+------------+-----------+ | ClientId | ClientName | ClientAge | +----------+------------+-----------+ | 1 | Chris | 21 | | 2 | Bob | 23 | | 3 | David | 24 | | 4 | Mike | 28 | +----------+------------+-----------+ 4 rows in set (0.00 sec)