在 2 个表（数据库）中选择一个实体

Question

这是我的mysql_query

$rs = mysql_query("SELECT calendar.datefield AS dateRow, po.po_no,cus_name,net FROM payments
                   RIGHT JOIN po ON payments.po_id=po.po_id
                   RIGHT JOIN calendar ON (DATE(po.po_date) = calendar.datefield)
                   WHERE calendar.datefield BETWEEN '$sDateFrom' AND '$sDateTo'
                  ") or die(mysql_error());// AND payments.pay_status='Paid'
?>

我想从另一个表中选择另一个实体

prod_desc FROM del_details

我怎样才能使用相同的格式查询呢？

公共密钥是 po_id

Answer 1

根据您的需要添加左/右连接..

$rs = mysql_query("SELECT calendar.datefield AS dateRow, po.po_no,cus_name,net, del_details.prod_desc 
                   FROM payments
                   RIGHT JOIN po ON payments.po_id=po.po_id
                   RIGHT JOIN calendar ON (DATE(po.po_date) = calendar.datefield)
                   JOIN del_details ON payments.po_id=po.po_id
                   WHERE calendar.datefield BETWEEN '$sDateFrom' AND '$sDateTo'
                  ") or die(mysql_error());// AND payments.pay_status='Paid'