Question

未能在规格中找到答案。

所以，我想知道：我可以在蜂巢中做那样的事情吗？

insert into table my_table
with a as
(
    select *
        from ...
        where ...  
),

b as
(
    select *
        from ...
        where ...  
)
select 
    a.a, 
    a.b, 
    a.c, 
    b.a, 
    b.b, 
    b.c 
from a join b on (a.a=b.a);

Answer 1

在Hive版本0.13.0中可用。 Usage documented here

Answer 2

我猜你总是可以使用子查询：

insert into table my_table
select 
    a.a, 
    a.b, 
    a.c, 
    b.a, 
    b.b, 
    b.c 
from
(
    select *
        from ...
        where ...  
) a
join 
(
    select *
        from ...
        where ...  
) b
on a.a = b.a;

Answer 3

Hadoop Hive WITH Clause Syntax and Examples 借助Hive WITH子句的帮助，您可以在同一查询构造中重复使用查询结果。您还可以使用WITH子句改进Hadoop Hive查询。您可以通过将复杂，复杂的重复代码移动到WITH子句并引用在SELECT语句中创建的逻辑表来简化查询。

带有SELECT语句的蜂巢WITH子句示例

WITH t1 as (SELECT 1), 
t2 as (SELECT 2),
t3 as (SELECT 3)
SELECT * from t1 
UNION ALL
SELECT * from t2
UNION ALL 
SELECT * from t3;

在INSERT语句中配置WITH子句 您可以在将数据插入表中时使用WITH子句。例如：

WITH t11 as (SELECT 10),
t12 as (SELECT 20),
t13 as (SELECT 3) 
INSERT INTO t1 
SELECT * from t11 
UNION ALL 
SELECT * from t12 
UNION ALL 
SELECT * from t13;

在hive中是否有sql WITH子句？

3 个答案: