摘要：
Change modifier of 'music' to finalhttp://stackoverflow.com/questions/1299837/cannot-refer-to-a-non-final-variable-inside-an-inner-class-defined-in-a-differen最近在写程序的时候一直出现这个提示,一直没有时间来查询原因.不解,先把标题留在这儿,有时间了来查看还有一个是实例化后的对象在赋为 return null时没有为null 阅读全文
Only one expression can be specified in the select list when the subquery is not introduced with EXI
摘要：
/*错误的*/select song.song_name,song.title_url,song.mv_url,singer.singer_name from WEBDB_PROD_SONG as song, WEBDB_PROD_SINGER as singer where song.singer_id=singer.singer_id andsong.song_name=(select* from WEBDB_PROD_SONG where song_name='F289D7C4')消息 116，级别 16，状态 1，第 1 行当没有用 EXISTS 引入子查询时，在选择列 阅读全文