MySQL 如何使用查询查找特定行

首先让我们创建一个表 –

mysql> create table DemoTable
(
   UserId int,
   UserName varchar(100)
);
Query OK, 0 rows affected (0.66 sec)

使用插入命令将一些记录插入表中 –

mysql> insert into DemoTable values(100,'Chris');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values(101,'Bob');
Query OK, 1 row affected (0.07 sec)
mysql> insert into DemoTable values(102,'David');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values(103,'Mike');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values(104,'Sam');
Query OK, 1 row affected (0.16 sec)

使用select语句显示表中的所有记录 –

mysql> select *from DemoTable;

将产生以下输出 –

+--------+----------+
| UserId | UserName |
+--------+----------+
|    100 | Chris    |
|    101 | Bob      |
|    102 | David    |
|    103 | Mike     |
|    104 | Sam      |
+--------+----------+
5 rows in set (0.00 sec)

以下是查询查找特定行并显示该行记录的语句 –

mysql> select *from DemoTable where UserId=102 and UserName='David';

将产生以下输出 –

+--------+----------+
| UserId | UserName |
+--------+----------+
|    102 | David    |
+--------+----------+
1 row in set (0.00 sec)

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