IF NOT EXISTS (SELECT 1 FROM KSQL_USERCOLUMNS WHERE KSQL_COL_TABNAME = 'T_PUR_DELIVERYSCHENTRY' AND KSQL_COL_NAME IN ('FJOINTDATACHANNELID')) 
 ALTER TABLE T_PUR_DELIVERYSCHENTRY ADD (FJOINTDATACHANNELID VARCHAR(80) DEFAULT ' ' NOT NULL );