我们可以在单个MySQL查询中使用WHERE,AND和OR吗?
是的,我们可以在一个查询中使用所有它们。让我们首先创建一个表-
mysql> create table DemoTable(
StudentId int,
StudentFirstName varchar(20),
StudentLastName varchar(20),
StudentAge int
);
使用插入命令在表中插入记录-
mysql> insert into DemoTable values(100,'John','Smith',23);mysql> insert into DemoTable values(101,'Carol','Taylor',24);
mysql> insert into DemoTable values(103,'John','Doe',22);
mysql> insert into DemoTable values(104,'Adam','Smith',23);
使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
这将产生以下输出-
+-----------+------------------+-----------------+------------+| StudentId | StudentFirstName | StudentLastName | StudentAge |
+-----------+------------------+-----------------+------------+
| 100 | John | Smith | 23 |
| 101 | Carol | Taylor | 24 |
| 103 | John | Doe | 22 |
| 104 | Adam | Smith | 23 |
+-----------+------------------+-----------------+------------+
4 rows in set (0.00 sec)
以下是在单个MySQL查询中使用MySQL WHERE和AND或OR来获取记录的查询-
mysql> select *from DemoTablewhere StudentFirstName='John' AND StudentLastName='Doe' OR StudentAge=26;
这将产生以下输出-
+-----------+------------------+-----------------+------------+| StudentId | StudentFirstName | StudentLastName | StudentAge |
+-----------+------------------+-----------------+------------+
| 103 | John | Doe | 22 |
+-----------+------------------+-----------------+------------+
1 row in set (0.00 sec)
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