sql - Comparing fields when a field has data in between 2 characters that match the field being compared -


i have code looks this:

left outer join     gme_batch_header bh  on     substr(ln.lot_number,instr(ln.lot_number,'(') + 1,     instr(ln.lot_number,')') - instr(ln.lot_number,'(') - 1)     =     bh.batch_no

it works fine, have come across few lot numbers have 2 sections of strings between parenthesis. how compare between second set of parenthesis? here example of data in lot number field: 

e142059-307-scrap-(74055)

this 1 works code,

58lf-3-b-2-2-2 (scrap)-(61448)

this 1 tries comparing scrap batch no, isn't correct. needs 61448.

the result last item in parenthesis.

after more research, got work code:

substr(ln.lot_number,instr(ln.lot_number,'(',-1) + 1, instr(ln.lot_number,')',-1) - instr(ln.lot_number,'(',-1) - 1)

-

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