oracle - How to Formulate IF THEN Rule as a Predicate -


i have table codes , processing dates. there business rule saying if code = 3 occures on day codes = 1 on day should supressed.

create table test (code number , processing_date date); insert test values (1,trunc(sysdate)); insert test values (2,trunc(sysdate)); insert test values (3,trunc(sysdate)); insert test values (1,trunc(sysdate)-1); insert test values (2,trunc(sysdate)-1); commit;

i figured solution. works fine, i'm extremly unhappy predicate, without comment not realy intuitive me. i'm sure i'll question meaning of predicate!

with codes ( select processing_date, code,  max(case when code = 3 'y' else 'n' end) on (partition processing_date) day_with_c3 test) select * codes -- if there day code = 3 ignore code = 1  (day_with_c3 != 'y' or code != 1) order processing_date, code;

is there other formulation horrible !a or b, describing better meaning of business rule if b?

try:

select * test t   code <> 1    or    not exists (     select null test t1     t1.processing_date = t.processing_date       , code = 3      )  order 2,1

demo: http://sqlfiddle.com/#!4/b4cf9/4


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