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select substr('AAA-BBB',1,instr('AAA-BBB','-',-1)-1),substr('AAA-BBB',instr('AAA-BBB','-',-1)+1) from dual
select substr('AAA-BBB',1,instr('AAA-BBB','-',-1)-1),substr('AAA-BBB',instr('AAA-BBB','-',-1)+1) from dual