Question

假设我有一张包含20个条目的表格。它们按日期（日期是列名＆gt; _＆gt;）按降序排序。我如何才能选择最新的条目和第15个最老的条目？

我通过执行以下查询获得所有15个结果

SELECT * FROM mytable m WHERE col1 = "zzz" ORDER BY date DESC LIMIT 15;

Answer 1

使用：

SELECT x.*
  FROM (SELECT a.*,
               @rownum := @rownum + 1 AS rank
          FROM mytable a 
          JOIN (SELECT @rownum := 0) r
         WHERE a.col1 = "zzz" 
      ORDER BY a.date DESC) x
 WHERE x.rank IN (1, 15)

Answer 2

您可能需要使用两个SELECT的UNION

(SELECT * FROM mytable m WHERE col1 = "zzz" ORDER BY date LIMIT 1, 15)
UNION
(SELECT * FROM mytable m WHERE col1 = "zzz" ORDER BY date DESC LIMIT 1)

更新：

添加括号

在单个查询中选择两个特定的mysql表行

2 个答案: