条件查询

select * from 表名 where 条件;

select * from students where id>3;

select * from subjects where id<=4;

select * from students where sname!=‘黄蓉‘;

select * from students where isdelete=0;

select * from students where id>3 and gender=0;

select * from students where id<4 or isdelete=0;

select * from students where sname like ‘黄%‘;

select * from students where sname like ‘黄_‘;

select * from students where sname like ‘黄%‘ or sname like ‘%靖%‘;

select * from students where id in(1,3,8);

select * from students where id between 3 and 8;

select * from students where id between 3 and 8 and gender=1;

select * from students where hometown is null;

select * from students where hometown is not null;

select * from students where hometown is not null and gender=0;