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我處理下面的代碼:如何按月正確排序sql查詢結果?
SELECT tbl.y YEAR, group_concat(month_posts SEPARATOR '-') dates
FROM (
SELECT YEAR(p.post_date) y, MONTH(p.post_date) m, concat(MONTH(p.post_date), ':', group_concat(p.id ORDER BY p.post_date ASC)) month_posts
FROM prt_posts p
WHERE (p.post_status = 'publish' OR p.post_status = 'future')
AND p.post_type = 'event'
AND p.post_date <= DATE('2016-12-31 00:00:00')
GROUP BY y, m
ORDER BY y, m ASC
) tbl
GROUP BY tbl.y
ORDER BY tbl.y DESC
結果是這樣的:
year | dates
-------------------------------------------------------------------
2016 | 11:121,122-12:117,118
-------------------------------------------------------------------
2015 | 1:128-12:138-2:139-3:129-4:130-5:131-6:132-7:133-8:119-9:134
-------------------------------------------------------------------
所有罰款eccept日期順序。正如你在第二排看到的那樣,它是1,12,2,3等等......雖然它應該是1,2,3,4等。 它是以字符串而不是數字排序的。
如何解決?