Question

首先，我使用的MYSQL版本是5.1.66-community-log。

现在我们已经解决了这个问题，我在尝试创建以下视图时检索到以下错误：

您的SQL语法有错误;检查手册对应于您的MySQL服务器版本，以便使用正确的语法靠近'all select RRA.id，RRA.reply_id as replyID，RRA.user_id， RRA.vote_up，RRA.rank'在第4行

和视图：

$sql = "Create or replace view userRank as 
select PRA.id, PRA.post_id as postID, PRA.user_id, PRA.vote_up, PRA.rank_date 
from post_rank_activity PRA
union all 
select RRA.id, RRA.reply_id as replyID, RRA.user_id, RRA.vote_up, RRA.rank_date 
from reply_rank_activity RRA";

我检查了一些网站，这似乎是正确的语法 - 或者随着时间的推移有所改变？

Answer 1

括号可能会有所帮助，请尝试：

Create or replace view userRank as 
(select PRA.id, PRA.post_id as postID, PRA.user_id, PRA.vote_up, PRA.rank_date 
from post_rank_activity PRA)
union all 
(select RRA.id, RRA.reply_id as replyID, RRA.user_id, RRA.vote_up, RRA.rank_date 
from reply_rank_activity RRA)

Answer 2

根据this，您的所有不需要，请尝试：

Create or replace view userRank as select PRA.id, PRA.post_id as postID, PRA.user_id, PRA.vote_up, PRA.rank_date from post_rank_activity PRA union select RRA.id, RRA.reply_id as replyID, RRA.user_id, RRA.vote_up, RRA.rank_date from reply_rank_activity RRA;

它应该有效 - 未经测试。

Answer 3

所有部分中的Union All列在名称和类型上必须相似

这两个是不同的

PRA.post_id作为postID
RRA.reply_id as replyID

Answer 4

这似乎是一个甚至在MySQL网站上提出的错误

http://bugs.mysql.com/bug.php?id=22044

无法创建MYSQL视图

4 个答案: