sql - Intersect table with different column value -

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i have table:

num type flag --- ---- ---- 11      1 12      1 13      1 14      1 15      1  12   b    2 13   b    2

how write query following result:

num type flag --- ---- ---- 11       1 14       1 15       1 

select num your_table num not in (   select num   your_table   type = 'b' )

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