MySQL选择多个值?
要选择多个值,可以将where子句与OR和IN运算符一起使用。
语法如下-
情况1-使用OR
select *from yourTablename where yourColumnName = value1 or yourColumnName = value2 or yourColumnName = value3,.........N;
情况2-使用IN
select *from yourTableName where yourColumnName IN(value1,value2,....N);
为了理解上述语法,让我们创建一个表。以下是创建表的查询-
mysql> create table selectMultipleValues−> (
−> BookId int,
−> BookName varchar(200)
−> );
现在,您可以借助insert命令在表中插入一些记录。插入记录的查询如下-
mysql> insert into selectMultipleValues values(100,'Introduction to C');mysql> insert into selectMultipleValues values(101,'Introduction to C++');
mysql> insert into selectMultipleValues values(103,'Introduction to java');
mysql> insert into selectMultipleValues values(104,'Introduction to Python');
mysql> insert into selectMultipleValues values(105,'Introduction to C#');
mysql> insert into selectMultipleValues values(106,'C in Depth');
在select语句的帮助下显示表中的所有记录。查询如下-
mysql> select *from selectMultipleValues;
以下是输出-
+--------+------------------------+| BookId | BookName |
+--------+------------------------+
| 100 | Introduction to C |
| 101 | Introduction to C++ |
| 103 | Introduction to java |
| 104 | Introduction to Python |
| 105 | Introduction to C# |
| 106 | C in Depth |
+--------+------------------------+
6 rows in set (0.00 sec)
以下是借助OR运算符选择多个值的查询。
情况1-使用OR运算符。
mysql> select *from selectMultipleValues where BookId = 104 or BookId = 106;
以下是输出-
+--------+------------------------+| BookId | BookName |
+--------+------------------------+
| 104 | Introduction to Python |
| 106 | C in Depth |
+--------+------------------------+
2 rows in set (0.00 sec)
情况2-使用In运算符。
以下是借助IN运算符选择多个值的查询。
mysql> select *from selectMultipleValues where BookId in(104,106);
以下是输出-
+--------+------------------------+| BookId | BookName |
+--------+------------------------+
| 104 | Introduction to Python |
| 106 | C in Depth |
+--------+------------------------+
2 rows in set (0.00 sec)
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