1.普通查询：
select * from Info #查询Info 表所有的内容
select Name,Code from Info #查询Info 表的Name,Code 列
2.条件查询
select * from Info where Sex=1#查询Info表中 Sex 为1的单元格
select * from Info where Sex=1 and Nation=‘n001‘ #查询Info表中Sex=1 并且 Nation=n001的数据
select * from Info where Sex=1 or Nation=‘n001‘ #查询Info表中Sex=1 或者 Nation=n001的数据
3.模糊查询
select * from ChinaStates where AreaName like ‘中%‘ #查询Chinastates表 AreaName列中以中开头的数据
select * from ChinaStates where AreaName like ‘%中%‘#查询ChinaStates表中AreaName列中包含中的数据
select * from ChinaStates where AreaName like ‘_中%‘ #查询ChinaStates表中AreaName列中第二个字为中的数据
4.排序查询
select * from Car order by Code desc #查询Car表中按Code列降序排列
select * from Car order by Code asc #查询Car表中按Code列升序排列
select * from Car order by Code ,Brand#查询Car表中按Code,Brand排列
5.统计查询（聚合函数）
select count(Oil) from Car #查询Car 表中 Oil 列中数据的条数
select max(Oil) from Car #查询Car表中Oil列中最大的数据
select min(Oil) from Car #查询Car表中Oil列中最小的数据
select avg(Oil) from Car #查询Car表中Oil列数据的平均值
6.分组查询
select Code,Brand, Count(*) from Car group by Brand# 查询Car表中分组查看每组的数据条数
select * from Car group by Brand having count(*)>1 #查询Car表中分组查看Brand中数据条数大于2的
7.分页查询
select * from Car limit 5,5 #查询Car表中跳过5条数据取5条数据