错误SET SQL_BIG_SELECTS = 1或SET MAX_JOIN_SIZE =＃

Question

我的查询存在问题......

SELECT 
keywords.keyword,
keywords.keyid,
sources.s_title,
sources.s_disc,
sources.s_link,
sources.sourceid,
sources.s_link
FROM link_ks
INNER JOIN keywords ON link_ks.keyid = keywords.keyid
INNER JOIN sources ON link_ks.sourceid = sources.sourceid
INNER JOIN thumbsup_items ON link_ks.sourceid = thumbsup_items.name
WHERE link_ks.keyid = :keyid 
order by thumbsup_items.votes_up desc,thumbsup_items.votes_down asc,(thumbsup_items.votes_up+thumbsup_items.votes_down) desc

当数据库很小时，每件事情都很好但随着数据库变大，我收到了这个错误

 The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET
 SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay

但是当我删除

 order by thumbsup_items.votes_up desc,thumbsup_items.votes_down asc,
(thumbsup_items.votes_up+thumbsup_items.votes_down) desc

问题得到解决......但order by对此查询很重要......

有没有其他方法来编写此查询或如何解决此问题？

Answer 1

的 MAX_JOIN_SIZE和SQL_BIG_SELECTS不允许您运行会导致服务器挂起的长查询。

在运行查询之前使用它：

 SET OPTION SQL_BIG_SELECTS = 1

或使用此：

SET SQL_BIG_SELECTS=1

chek this

Answer 2

对于那些像我一样第一次看到这个的人......

this =＆gt;

$ setupMySql = mysql_query（＆＃34; SET OPTION SQL_BIG_SELECTS = 1＆＃34;）        或死（＆＃39;无法完成SETUP BIG SELECTS，因为：＆＃39; .mysql_error（））;