IF NOT EXISTS (SELECT 1 FROM KSQL_USERCOLUMNS WHERE KSQL_COL_TABNAME = 'T_ER_CONTRACTBILL_S' AND KSQL_COL_NAME ='FPRORATATAXAMOUNT')
ALTER TABLE T_ER_CONTRACTBILL_S ADD (FPRORATATAXAMOUNT DECIMAL(23,10) DEFAULT 0 NOT NULL);