MySQL ORDER BY ??? ????? ? ?? ????
?????? ???? ???? ???? ???? ?? ???? ??? ?????. ??? ??? ???? ?? ?? ??? ?????? ?? ??? ????. ? ????? MySQL?? ORDER BY ?? ???? ?? ???? ??? ???? ?? ?? ?? ??? ???? ?? ???? ???? ?????.
?? ??:
"id"? "name"??? ? ?? ?? ??? "tbl"??? MySQL ???? ??? ???. "??" ?? ???? ?????? ???? ??? ???? ??? ????.
<code>+-----------+--------------------+ | id | name | +-----------+--------------------+ | 5 | Alpha | | 7 | Beta | | 3 | Delta | | ... | ... | | 1 | Zed | +-----------+--------------------+</code>
??:
??? ??? ????? "??" ?? ?? ????? ?? ??? ???? ????. ??? ??? ??? ??? ???.
<code>+-----------+-------------+--------------+ | id | position | name | +-----------+-------------+--------------+ | 7 | 2 | Beta | +-----------+-------------+--------------+</code>
?? 1: ???? ??
ORDER BY ??? ?? ?? ??? ??????? ?? ??? ???? ?? ??? ?? ????? ? ??? ??? ? ????. ?? ??? ?? ????? ?????.
SELECT x.id,
x.position,
x.name
FROM (SELECT t.id,
t.name,
@rownum := @rownum + 1 AS position
FROM tbl t
JOIN (SELECT @rownum := 0) r
ORDER BY t.name) x
WHERE x.name = 'Beta'
? ????? ??? ?? ??(@rownum)? ???? ?? ? ??? ???? ?? ??(??? ??)? ????. @rownum := 0?? ???? ?? ???? JOIN? ???? ??? 1?? ????? ?????. WHERE ?? ??? ????? ??? "Beta"? ?? ?????.
?? 2: ?? ??
??? ?? ?? ??? ?? ?? ??? ???? ? ????.
SELECT t.id,
(SELECT COUNT(*)
FROM tbl x
WHERE x.name < t.name) + 1 AS position,
t.name
FROM tbl t
WHERE t.name = 'Beta';
? ??? ???? 1? ?? ?? ??? ??? ??? ?? ?? ?? ???? ??? ?????. ??? ? ?? ??? ???? ??? ?? ?? ???? ??? ?? ?? ??? ? ??? ?? ???? ?? ?????.
? ??? MySQL ORDER BY ??? ? ??? ????? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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