Question

SELECT 
t3.transaction_id,
t3.transaction_no,
t3.retrivel_ref_no,
t3.transaction_type,
t3.reversal_flag,
t3.expires_on,
t3.currency_code,
t3.message_reason_code,
t4.sales_person_id,
t3.card_no,
t3.transaction_amount,
t3.transmission_date_time
FROM TRANSACTION AS t4
INNER JOIN
(   SELECT
    t2.transaction_id,
    t2.transaction_no,
    t2.retrivel_ref_no,
    t2.transaction_type,
    t2.reversal_flag,
    t2.transmission_date_time,
    t2.transaction_amount,
    t2.card_no,
    t2.expires_on,
    t2.currency_code,
    t1.message_reason_code
    FROM
    (   SELECT*
        FROM    transaction_pci_details 
        WHERE   message_reason_code LIKE '%OUT%'|| 
            message_reason_code LIKE '%FAILED%'
    ) AS t1
    INNER JOIN
    (   
        SELECT*
        FROM    transaction_pci_details 
        WHERE   action_code LIKE '%REQ%'
    ) AS t2
    ON t1.transaction_no = t2.transaction_no    
) AS t3
ON t4.transaction_id = t3.transaction_id;

Answer 1

(SELECT* FROM transaction_pci_details WHERE
    message_reason_code LIKE '%OUT%'|| message_reason_code LIKE '%FAILED%') AS t1 
INNER JOIN
(SELECT* FROM transaction_pci_details WHERE 
    action_code LIKE '%REQ%' ) AS t2 
ON t1.transaction_no = t2.transaction_no

可以简化为

SELECT* FROM transaction_pci_details as t1, transaction_pci_details as t2 WHERE
    (t1.message_reason_code LIKE '%OUT%'|| t1.message_reason_code LIKE '%FAILED%') 
    AND t2.action_code LIKE '%REQ%'
    AND t1.transaction_no = t2.transaction_no

没有INNER_JOIN。

也许你可以通过这种方式摆脱其他INNER_JOIN。

你也可以通过写SELECT

来摆脱SELECT * FROM mytable后的lisis

有没有办法简化给定的mysql查询

1 个答案: