hive 中是否有等價的 sql WITH 子句？

Question

未能在規范中找到答案。

所以，我想知道：我可以在蜂巢中做這樣的事情嗎？

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

從版本0.13.0開始，Hive 中可用。 此處記錄了用法。

Answer 2

我想你總是可以使用子查詢：

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 子句語法和示例借助 Hive WITH 子句，您可以在同一查詢構造中重用查詢結果。 您還可以使用WITH子句改進 Hadoop Hive 查詢。 您可以通過將復雜、復雜的重復代碼移動到 WITH 子句並引用在 SELECT 語句中創建的邏輯表來簡化查詢。

---

帶有 SELECT 語句的 Hive 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;

INSERT 語句中的 Hive WITH 子句您可以在向表中插入數據時使用 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;