関連ワード:  db2 sql convert number to string    db2 sql convert number to string with leading zeros    db2 sql convert integer to string    ibm db2 sql convert number to string    db2 sql cast integer to string    db2 sql convert to string    db2 sql convert string to date    db2 sql convert hex to string    db2 sql convert timestamp to string    db2 sql convert string to decimal