sql - TSQL find missing Values for repeating records -

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sample data:

pageid  attribute 2860    category 2860    sub-category 2861    tag 2861    tag 2862    tag 2862    category 2863    sub-category 2883    category 2883    sub-category

problem # 1: need find page ids attribute sub-category not exists result should : 

2861 2862

problem # 2: need find page ids attribute sub-category , attribute category both not exists result should : 

2861

1)

select pageid  thetable  pageid not in (select pageid thetable attribute = 'sub-category')

2)

select pageid  thetable  pageid not in (select pageid thetable attribute = 'sub-category') , pageid not in (select pageid thetable attribute = 'category')

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