我有一个专栏,时间是'DATETIME'。我想按时间轴的顺序输出它,但是当我使用ORDER BY create_time DESC
时,'2011-09-10 16:16:04'落后'2011-07-16 03:20:01'。
似乎它正在将datatime列视为字符串。
如何在不更改列类型的情况下处理此问题?
更新:
这是我的查询的一部分:
SELECT 'bookcomment' AS type
,b.book_id
,b.name
,c.book_id
,c.author_id
,c.content
,c.create_time as create_time
,u.id
,u.name
FROM tbl_book AS b,
tbl_book_comment AS c,
tbl_user AS u
WHERE u.id=c.author_id in (1,2) AND b.book_id=c.book_id
UNION ALL
SELECT 'bookreview' AS type
,b.book_id
,b.name
,re.book_id
,re.author_id
,re.content
,re.create_time as create_time
,u.id
,u.name
FROM tbl_book AS b,
tbl_book_review AS re,
tbl_user AS u
WHERE u.id=re.author_id in (1,2) AND b.book_id=re.book_id
UNION ALL
...
ORDER BY create_time DESC
部分输出:
array(7) { ["type"]=> string(16) "new post comment" ["book_id"]=> string(1) "1" ["name"]=> string(9) "Whatever" ["author_id"]=> string(4) "test" ["content"]=> string(19) "2011-07-16 03:20:01" ["create_time"]=> string(1) "3" ["id"]=> string(1) "1" }
array(7) { ["type"]=> string(16) "new post comment" ["book_id"]=> string(1) "1" ["name"]=> string(9) "whatever" ["author_id"]=> string(13) "sdfwefwaefwea" ["content"]=> string(19) "2011-05-11 03:33:33" ["create_time"]=> string(1) "3" ["id"]=> string(1) "1" }
array(7) { ["type"]=> string(16) "new post comment" ["book_id"]=> string(1) "1" ["name"]=> string(9) "whatever" ["author_id"]=> string(5) "test0" ["content"]=> string(19) "2011-09-10 16:16:04" ["create_time"]=> string(1) "3" ["id"]=> string(1) "1" }
array(7) { ["type"]=> string(16) "new post comment" ["book_id"]=> string(1) "1" ["name"]=> string(9) "whatever" ["author_id"]=> string(5) "test1" ["content"]=> string(19) "2011-09-10 16:16:04" ["create_time"]=> string(1) "3" ["id"]=> string(1) "1" }
array(7) { ["type"]=> string(16) "new post comment" ["book_id"]=> string(1) "1" ["name"]=> string(9) "whatever" ["author_id"]=> string(5) "test2" ["content"]=> string(19) "2011-09-10 16:16:04" ["create_time"]=> string(1) "3" ["id"]=> string(1) "1" }
array(7) { ["type"]=> string(16) "new post comment" ["book_id"]=> string(1) "1" ["name"]=> string(9) "whatever" ["author_id"]=> string(5) "test3" ["content"]=> string(19) "2011-09-10 16:16:04" ["create_time"]=> string(1) "3" ["id"]=> string(1) "1" }
array(7) { ["type"]=> string(16) "new post comment" ["book_id"]=> string(1) "1" ["name"]=> string(9) "whatever" ["author_id"]=> string(5) "test4" ["content"]=> string(19) "2011-09-10 16:16:04" ["create_time"]=> string(1) "3" ["id"]=> string(1) "1" }
答案 0 :(得分:2)
您似乎将数据包含在错误的列中。在您的输出示例中,create_time
对于所有这些都是3
,因此订单未定义。仔细检查数据在右栏?
答案 1 :(得分:0)
尝试使用
ORDER BY CONVERT (create_time, DATETIME) DESC
但要注意这会花费一些性能......改变列类型是恕我直言更好的选择!