SQL - how to delete from one table while referring fom other table? -

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How can I erase AT and AC from Table A while comparing two BPs of BP and BC BR = 1?

Actually there is not the following work but should go in this direction, unfortunately I can not understand how ... 

  Remove from one (AP = BP and AC = BC, where BC = 1) remove from one place (select BP, B to B, B = 1)  

  where it exists (SELECT NULL FROM B WHERE BP = AP AND BC = AC AND BR = 1)

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