我到目前为止写的最长的一个SQL语句-优快云博客

本文分享了一个复杂的MySQL SQL查询语句，该查询从多个关联表中提取项目信息，包括项目名称、类别、权限方案等，并对其进行了分组和排序。作者希望通过高手指正，了解这一查询的效率。

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[size=large]这个是我昨天写的一个SQL语句，是mysql的，本身想用程序来写的，最后还是用sql写出来了，小有自豪感。但不知道效率如何，还的请高人指点。[/size]


select na.source_node_id as project_id, p.pname,
         (select pc.cname 
                   from projectcategory as pc 
                   where pc.id in (select na_2.sink_node_id 
                                     from nodeassociation as na_2 
                                     where na_2.sink_node_entity = 'ProjectCategory' 
                                     and na_2.source_node_id = na.source_node_id)
           ) as 'ProjectCategory', 

           (select ps.name from permissionscheme as ps 
                   where ps.id in (
                   select na_2.sink_node_id 
                   from nodeassociation as na_2 
                   where na_2.sink_node_entity = 'PermissionScheme' 
                   and na_2.source_node_id = na.source_node_id)
         )as 'PermissionScheme',

         ra.roletypeparameter,

         (select itss.name 
                   from issuetypescreenscheme as itss 
                   where itss.id in (select na_2.sink_node_id 
                            from nodeassociation as na_2 
                            where na_2.sink_node_entity = 'IssueTypeScreenScheme' 
                            and na_2.source_node_id = na.source_node_id)
         )as 'IssueTypeScreenScheme'

 from nodeassociation as na

 join project as p 
 on na.source_node_id = p.id

 join projectroleactor as ra
 on na.source_node_id = ra.pid and ra.projectroleid = 10040

group by na.source_node_id
order by na.source_node_id, na.sink_node_entity;