数据库系统开发实验二

N_TIME CHAR(18) NULL ,Р?SERVICE_END_TIME CHAR(18) NULL ,Р?SERVICE_TYPE CHAR(18) NULL ,Р?SERVICE_SPECIALIST CHAR(18) NULL ,Р?CONTRACT_ID CHAR(18) NULL ,Р?SERVICE_DETAIL CHAR(18) NULL ,Р?ORGNIZATION_ID CHAR(18) NULL ,Р?CUSTOMER_NAME CHAR(18) NULL ,Р?CUSTOMER_PHONE CHAR(18) NULL Р);РCREATE UNIQUE INDEX XPKAFTER_SALE_SERVICE ON AFTER_SALE_SERVICEР(AFTER_SALE_SERVICE_ID ASC);РALTER TABLE AFTER_SALE_SERVICEР?ADD CONSTRAINT XPKAFTER_SALE_SERVICE PRIMARY KEY (AFTER_SALE_SERVICE_ID);РCREATE TABLE CONTRACTР(Р?CONTRACT_ID CHAR(18) NOT NULL ,Р?NAME CHAR(18) NULL ,Р?AMOUNT CHAR(18) NULL ,Р?TECHNICAL_RESULT CHAR(18) NULL ,Р?TECHNICAL_DATE CHAR(18) NULL ,Р?BUSINESS_RESULT CHAR(18) NULL ,Р?BUSINESS_DATE CHAR(18) NULL ,Р?SALE_ID CHAR(18) NOT NULL ,Р?TECHNICAL_ID CHAR(18) NULL ,Р?BUSINESS_ID CHAR(18) NULL ,