Question

我创建了这段代码，但似乎没有用。是否适用于where子句paymentnotification.subpayment和collections.status

    $sql = "SELECT collections.categoryid,collections.handler,collections.status,paymentnotification.categoryid,paymentnotification.amount,paymentnotification.payee,paymentnotification.paymentdate 
FROM collections
INNER JOIN paymentnotification
ON paymentnotification.month=collections.month AND paymentnotification.categoryid=collections.categoryid
 WHERE paymentnotification.subpayment=? AND  collections.status=? AND collections.year=? BETWEEN ? AND ?";
$p = $conn->prepare($sql);
$p->execute(array($payment,$status,$year,$monthc,$monthc2));

Answer 1

一个问题是：

AND collections.year=? BETWEEN ? AND ?

显然应该是这样的：

AND collections.year=? AND collections.month BETWEEN ? AND ?

（顺便提一下，我建议使用较短的线条，放置良好的换行符。当你必须水平滚动阅读每一行时，很难遵循。）

这个mysql内连接代码有什么问题？

1 个答案: