Question

我在hive中使用以下查询：

SELECT COUNT(DISTINCT INDIV_ID) FROM TABLEA 
    WHERE CAR1="BLUE" AND INDIV_ID 
    IN (SELECT DISTINCT INDIV_ID FROM TABLEA WHERE CAR2="RED" AND CAR3="WHITE")

我现在已经理解带有子句的子查询在Hive中不起作用。上面的查询的目的只是为了理解Hive的子查询中的位置的替代。

有人可以告诉我如何在Hive中编写上述查询吗？

Answer 1

你可以使用CTE，我添加了“CAR_R_W”CTE。下面是修改后的查询。

WITH CAR_R_W
AS (
    SELECT DISTINCT INDIV_ID
    FROM TABLEA
    WHERE CAR2 = "RED"
        AND CAR3 = "WHITE"
    )
SELECT COUNT(DISTINCT INDIV_ID)
FROM TABLEA
WHERE CAR1 = "BLUE"
    AND INDIV_ID IN (
        SELECT INDIV_ID
        FROM CAR_R_W
        );

where子句使用“IN”进行HIVE中的子查询

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