Identify Parent Child records using oracle SQL and avoid merge -

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i have requirement find parent child accounts using sql query , avoid merge process if survivor child , loser parent. have records in table x in following format

survivor       loser 400-giz-514   400-1729e3

table x temporary table , records in them stored in base tables in base table relationship between these 2 records is

          row_id          par_ou_id  parent    400-1729e3      null child     400-giz-514     400-1729e3

please me query identify these type of records , flag them not picked nightly process merge.

should able remove records temp table using 

delete tablex  exists (     select 1       basetable     basetable.row_id = tablex.survivor           , basetable.par_ou_id = tablex.loser     )

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