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You must execute the code again to save those values in the database.
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WHERE EXT1.COD_NUM_CHAR BETWEEN 700 AND 999
      *
ERROR at line 8:
ORA-01722: unable to convert string value containing 'S' to a number:
COD_NUM_CHAR
ORA-03302: (ORA-01722 details) invalid string value: SCGAR