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CREATE TABLE table_name (COL1, COL2) AS SELECT 1, 'A-B' FROM DUAL UNION ALL SELECT 2, 'C-D' FROM DUAL UNION ALL SELECT 3, 'AAA-BB' FROM DUAL;
3 rows affected
SELECT t.col1, l.col2 FROM table_name t CROSS JOIN LATERAL ( SELECT SUBSTR(col2, 1, INSTR(col2, '-') - 1) AS col2 FROM DUAL UNION ALL SELECT SUBSTR(col2, INSTR(col2, '-') + 1) FROM DUAL ) l
COL1
COL2
1
A
1
B
2
C
2
D
3
AAA
3
BB