mysql主要有算数运算符、比较运算符、逻辑运算符、位运算符
1、算数运算符
+ select 1+2;
- select 1-2;
* select 1* 2;
/ 或div select 1/2; or select 1 div 2;
% 或 mod select 1%2; or select 1 mod 2;
2、比较运算符
= select 2=3;
<> != select 2<>3;
> select 2>3;
< select 2<3;
<= select 2<=3;
>= select 2>=3
between select 5 between 0 and 10;
not between select 5 not between 0 and 10;
in select 5 in (1,2,3,4,5)
not in select 5 not in (1,2,3,4,5)
<=> 严格比较两个null值是否相等，两个操作码均为null时，值为1，当一个操作码为null时，值为0 select 1<=>2 ;select null<=>null;
like select '123456' like '12%';
is null select null is null;
is not null select 'a' is not null;
regexp 或rlike 正则式匹配 select 'beijing' regexp 'jing';
3、逻辑运算符
not ! and or xor
select 2 and 0;
select 2and 1;
select 2 or 0;
select 2 or 1;
select not 1;
select !0;
select 1 xor 1;
4、位运算符
& | ^ ! << >>
1、按位与
mysql> select 3&5; +-----+ | 3&5 | +-----+ | 1 | +-----+
2、按位或
mysql> select 3|5; +-----+ | 3|5 | +-----+ | 7 | +-----+
3、按位异或
mysql> select 3^5; +-----+ | 3^5 | +-----+ | 6 | +-----+
4、按位取反
mysql> select ~18446744073709551612; +-----------------------+ | ~18446744073709551612 | +-----------------------+ | 3 | +-----------------------+
5、按位右移
mysql> select 3>>1; +------+ | 3>>1 | +------+ | 1 | +------+
6、按位左移
mysql> select 3<<1; +------+ | 3<<1 | +------+ | 6 | +------+
运算符优先级
最低优先级为： :=。
最高优先级为： !、BINARY、 COLLATE。