php - 删除另一个数据库中不存在的项目

Question

我尝试使用此代码来删除另一个数据库中不存在的项目，我该怎么办？

mysqli_query($link,"delete from payment where INVOICE_NO_MX NOT IN(select * from invoice) ");

Answer 1

您应该将 INVOICE_NO_MX 与 invoice 中的正确列进行比较。像这样的事情:

DELETE
FROM payment
WHERE INVOICE_NO_MX NOT IN (SELECT INVOICE_NO_MX FROM invoice)
                                    ^^^ replace with appropriate column name