|—|—|—|
|>|大于||
|>=|大于等于||
|<|小于||
|<=|小于等于||
|=|等于||
|<>或!=|不等于||
|BETWEEN … AND …|在某个范围之内(含最小、最大值)||
|IN(…)|在in之后的列表中的值,多选一||
|LIKE 占位符|模糊匹配(_匹配单个字符, %匹配任意个字符)|
select * from emp where name like '__';
||IS NULL|是NULL||
select * from emp where name like '__';
|