IF NOT EXISTS (SELECT 1 FROM KSQL_USERCOLUMNS WHERE KSQL_COL_TABNAME = 'T_RIM_INV_AIR' AND KSQL_COL_NAME ='FSEATGRADE_NAME')
 ALTER TABLE T_RIM_INV_AIR ADD (FSEATGRADE_NAME NVARCHAR(50) DEFAULT ' ' NOT NULL );