fScan Reference Manual, Chapter 2 (CmdLineOptions): table_merge
usage: -table merge TBLNAME FLAG TBL2NAME MERGECOL
This command will merge rows of data from table TBL2NAME into table TBLNAME, based on the value of column MERGECOL. MERGECOL must exist in both tables. Values in MERGECOL should be unique within each table.
If deleting, delete rows in TBL if not found in TBL2.