我试图找到两张桌子之间的区别。表格是
示例数据
PERSON_PHOTO
ID USERID FNAME
801 uid01 Geroge
801 uid05 George
803 uid01 George
901 uid01 Alice
201 uid01 Alice
330 uid01 Alice
802 uid05 Alice
803 uid05 Alice
804 uid05 Alice
901 uid05 Alice
701 uid05 Alice
201 uid05 Alice
101 uid05 Alice
330 uid05 Alice
501 uid05 Alice
501 uid12 Jane
330 uid12 Jane
101 uid12 Jane
201 uid12 Jane
701 uid12 Jane
801 uid12 Jane
901 uid12 Jane
101 uid07 Mary
101 uid03 Mary
201 uid03 Mary
801 uid03 Mary
901 uid03 Mary
201 uid15 Tom
801 uid15 Tom
表VALID_FRIEND
FNAME USERID
Bill uid02
George uid01
Mary uid07
Jane uid12
Tom uid15
Alice uid05
Mary uid03
SAMPLE OUTPUT
USERID PHOTOS NOT IN
uid02 0
uid01 5
uid07 9
uid12 3
uid15 8
uid05 8
uid03 6
我试图执行的查询是查找此人不在的照片数量。我尝试按USERID输出以及当前不在的照片数量。我知道我需要查找人物照片中不同PID的计数，并获取照片中用户ID的计数差异。谢谢你的帮助。