hive with查询用法及CTAS的使用

with  q1  as  (  select  key  from  src  where  key  =  '5' )
select  *
from  q1;

-- from style
with  q1  as  ( select  *  from  src  where  key =  '5' )
from  q1
select  *;

-- chaining CTEs
with  q1  as  (  select  key  from  q2  where  key  =  '5' ),
q2  as  (  select  key  from  src  where  key  =  '5' )
select  *  from  ( select  key  from  q1) a;

-- union example
with  q1  as  ( select  *  from  src  where  key =  '5' ),
q2  as  ( select  *  from  src s2  where  key  =  '4' )
select  *  from  q1  union  all  select  *  from  q2;

CTE in Views, CTAS, and Insert Statements

-- insert example
create  table  s1  like  src;
with  q1  as  (  select  key , value  from  src  where  key  =  '5' )
from  q1
insert  overwrite  table  s1
select  *;

-- ctas example
create  table  s2  as
with  q1  as  (  select  key  from  src  where  key  =  '4' )
select  *  from  q1;

-- view example
create  view  v1  as
with  q1  as  (  select  key  from  src  where  key  =  '5' )
select  *  from  q1;
select  *  from  v1;

-- view example, name collision
create  view  v1  as
with  q1  as  (  select  key  from  src  where  key  =  '5' )
select  *  from  q1;
with  q1  as  (  select  key  from  src  where  key  =  '4' )
select  *  from  v1;