在mysql查询中添加where子句？

Question

我有一个非常复杂的查询，它获取invoicNo唯一的表的最后一行。我想在此查询中添加一个where子句，如

WHERE bill_type LIKE '$invoice.

这是我当前的查询

Select * From (SELECT t.*, @rownum := @rownum + 1 AS rank FROM
 selected_items t, (SELECT @rownum := 0) r order by rank DESC) si GROUP
 BY si.invoiceNo;

这就是我的数据库的外观

感谢任何帮助或建议。谢谢你:)

Answer 1

你走了。

  Select * From (SELECT t.*, @rownum := @rownum + 1 AS rank FROM
    selected_items t, (SELECT @rownum := 0) r order by rank DESC) si
     WHERE bill_type LIKE <Bill_type_value>
 GROUP BY si.invoiceNo;

相应地替换<Bill_type_value>