hive sql 語法總結

一、limit 語句

限制返回的行數

二、列別名

 count(1) as times 

三、嵌套select語句

 select xxx from (select xx from table1 ) a ;

四、case ...when ...then語句

用戶處理單個列的查詢結果

select name,
  case 
   when salay <50000 then 'low'
   when salay >=50000 and salary <70000 then 'middle'
   else 'high'
  end as bracket from employee;