Question

我想你我可以成为一个老屁，但是我已经做了我的SQL（虽然我不是专家），我很确定有更好的方法来写这个。希望你能帮助我。

SELECT
    (SELECT MIN(bank_id) FROM bank) AS MinBank,
    (SELECT MAX(bank_id) FROM bank) AS MaxBank,
    (SELECT bank_id FROM bank WHERE bank_id = $UserID) AS OldBankID,
    (SELECT bank_name FROM bank WHERE bank_id = OldBankID) AS OldBankName,
    (SELECT bank_interest FROM bank WHERE bank_id = OldBankID) AS OldBankInterest,
    (SELECT bank_fees FROM bank WHERE bank_id = OldBankID) AS OldBankFees,
    (SELECT bank_pic_url FROM bank WHERE bank_id = OldBankID) AS BankPic
    (SELECT bank_id FROM bank HAVING bank_id > (SELECT bank_id FROM users WHERE uid = $UserID) LIMIT 1) AS NewBankID,
    (SELECT bank_name FROM bank WHERE bank_id = NewBankID) AS NewBankName,
    (SELECT bank_interest FROM bank WHERE bank_id = NewBankID) AS NewBankInterest,
    (SELECT bank_fees FROM bank WHERE bank_id = NewBankID) AS NewBankFees,
    (SELECT bank_cost FROM bank WHERE bank_id = NewBankID) AS NewBankCost,
FROM dwrel_bank LIMIT 1

基本上它是2个表：（用户）表1 - 检索Bank_ID（客户的旧ID）（银行）表2 - 获取他们的旧银行信息并检索他们的下一个“升级”可用性。

它确实给了我想要的信息，但想知道我是否能以某种方式改进它。

谢谢！

Answer 1

您可以根据oldBankId更改第一部分，如下所示

 select bank_id OldBankId ,bank_name OldBankName, bank_interest OldBankInterest ,
 bank_fees OldBankFees, bank_pic_url as BankPic from bank
 where bank_Id =(select bank_id from bank where bank_id= $user_id)

你必须使用newBank Id加入它并使用与上面相同的语法

mySQL - 正确的方法吗？

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