IF NOT EXISTS (SELECT 1 FROM KSQL_USERCOLUMNS WHERE KSQL_COL_TABNAME = 'T_SEC_USERINFOCLEANSCHEME_L' AND KSQL_COL_NAME IN ('FDESC')) 
 ALTER TABLE T_SEC_USERINFOCLEANSCHEME_L ADD (FDESC NVARCHAR(255) DEFAULT ' ' NOT NULL );