标题:指定一个ID找到上下的区域
作者:网友
日期:2022-07-28 22:40:56
内容:
倒是不复杂
需求:
实现思路:
给定一个ID,比如272944
如果表中的ID大于这个值,则自定义变量自增加一,
如果表中的ID小于这个值,则用这个值减去表中ID,
如果表中的ID等于这个值,则为0
SELECT
a.ZpID,
WHEN a.zpid - 272944 > 0 THEN @a:=@a + 1
WHEN a.zpid - 272944 < 0 THEN a.zpid - 272944
ELSE 0
END AS rn
FROM
zp_audio_video a, (SELECT @a:=0) vars
WHERE
a.State = 1
AND a.Labels LIKE '三周年站庆歌曲类%'
ORDER BY a.Zpid
结果:
最后过滤找到结果:
SELECT
*
FROM
(
SELECT
a.ZpID,
WHEN a.zpid - 272944 > 0 THEN @a:=@a + 1
WHEN a.zpid - 272944 < 0 THEN a.zpid - 272944
ELSE 0
END AS rn
FROM
zp_audio_video a, (SELECT @a:=0) vars
WHERE
a.State = 1
AND a.Labels LIKE '三周年站庆歌曲类%'
ORDER BY a.Zpid
) a
WHERE
rn <= 5 AND rn != 0
ORDER BY rn DESC
LIMIT 10;
(编辑:错新网)