别名.txt

SQL语句集锦,很多精彩的语句,希望深入SQL的朋友可以研究一下.

1:   select   *   from     
  2:   (   
  3:   select   yw_shangsi,   sum(case   yw_del   when   1   then   1   else   0   end)   as   num     
  4:   from   yewuyuan     
  5:   group   by   yw_shangsi   having   sum(case   yw_del   when   1   then   1   else   0   end)>=3   
  6:   )   
    
  服务器:   消息   170，级别   15，状态   1，行   6   
  第   6   行:   ')'   附近有语法错误。   
    1:   select   *   from     
  2:   (   
  3:   select   yw_shangsi,   sum(case   yw_del   when   1   then   1   else   0   end)   as   num     
  4:   from   yewuyuan     
  5:   group   by   yw_shangsi   having   sum(case   yw_del   when   1   then   1   else   0   end)>=3   
  6:   )   aa   
    
  这样就没问题了

内嵌视图，要定义别名才能在select   后作为表使用