SQL commands may be embedded in a "C" program with the routine mscall. The routine mscall takes two  arguments,  the database name and the SQL command.

      mscall (database_directory, sql_command);
      

Both the database name and the SQL command are strings. The strings may be built by the application program. The routine returns zero (0) if the statement succeeds, and a non-zero value if it fails. A failure may be caused by different events such as a syntax error in the SQL command, or an invalid attribute or table name.