select field1,field2 from tab_name;
select distinct field from tab_name; 去重,取第一个
select name as 姓名 from tab_name; 可以不加as
使用where子句,进行过滤查询
order by 列名,排序(升序)
ASC 升序(默认) Desc 降序
Mysql 在执行sql语句时的执行顺序:from where select group by having order by
select field1,field2 from tab_name;
select distinct field from tab_name; 去重,取第一个
select name as 姓名 from tab_name; 可以不加as
使用where子句,进行过滤查询
order by 列名,排序(升序)
ASC 升序(默认) Desc 降序
Mysql 在执行sql语句时的执行顺序:from where select group by having order by