Question

伙计们，我有一个在oracle 10.2中运行两个表的代码。这些表有大量数据，在使用和存在函数时，需要很长时间才能给出答案。我在下面的代码中做错了什么。

SELECT  'Total' nationality,
        SUM(
          CASE
          WHEN new_store_code IN ('40022', '40041', '40021', '40023','40074')
          THEN amount
          END
        ) cy_all_sale
FROM    txn_2017_18 a
WHERE   (CONCEPT) = 'Home center'
AND     invoice_date <= (select To_DT from Data_Date)
And     Department_Code in ('306','307','308','309','310','311','312','313','314','315','318')
AND     EXISTS (
          SELECT 1
          FROM   txn_2016_17 b
          WHERE  a.member_card_number = b.member_card_number
          AND    (b.CONCEPT) = 'Home center'
          AND    invoice_date <= (select LY_To_DT from Data_Date)
          And    Department_Code in '306','307','308','309','310','311','312','313','314','315','318')
          AND     (a.CONCEPT) = (b.CONCEPT)
          and     A.New_Store_Code=B.New_Store_Code
        )

Answer 1

我认为你可以尝试这种方法，使用2 sub select，每个来自txn_2017_18＆amp; txn_2016_17，然后JOIN将它们放在一起，如下所示。但首先要确保您的表根据查询条件正确编制索引。

SELECT
    'Total' nationality,
    SUM(amount) cy_all_sale
FROM
(
    SELECT * FROM txn_2017_18
    WHERE
        new_store_code IN ('40022', '40041', '40021', '40023', '40074')
        AND CONCEPT = 'Home center'
        AND invoice_date <= (select To_DT from Data_Date)
        AND Department_Code in ('306','307','308','309','310','311','312','313','314','315','318')
) a
JOIN
(
    SELECT * FROM txn_2016_17
    WHERE
        new_store_code IN ('40022', '40041', '40021', '40023', '40074')
        AND CONCEPT = 'Home center'
        AND invoice_date <= (select LY_To_DT from Data_Date)
        And Department_Code in '306','307','308','309','310','311','312','313','314','315','318')
) b

ON a.member_card_number = b.member_card_number
    AND a.New_Store_Code = b.New_Store_Code
    AND a.CONCEPT = b.CONCEPT

Oracle查询需要很长时间使用Exist函数

1 个答案: