[英]Don't understand why my SQL isn't working
/* DROP TABLE STATEMENTS*/
DROP TABLE BUILDING CASCADE CONSTRAINTS PURGE;
DROP TABLE ROOM CASCADE CONSTRAINTS PURGE;
DROP TABLE CONFERENCESESSION CASCADE CONSTRAINTS PURGE;
DROP TABLE SPEAKER CASCADE CONSTRAINTS PURGE;
/* CREATE TABLE STATEMENTS*/
CREATE TABLE BUILDING(
BUILDINGNO CHAR(2),
BUILDINGWING VARCHAR2(15),
BUILDINGLANE VARCHAR2(15),
CONSTRAINT BUILDING_PK PRIMARY KEY(BUILDINGNO));
CREATE TABLE ROOM(
BUILDINGNO CHAR(2),
ROOMNO CHAR(2),
ROOMCAPACITY NUMBER(3),
CONSTRAINT ROOM_PK PRIMARY KEY(BUILDINGNO, ROOMNO),
CONSTRAINT ROOM_FK FOREIGN KEY(BUILDINGNO) REFERENCES BUILDING(BUILDINGNO));
CREATE TABLE SPEAKER(
SPEAKERID CHAR(2),
SPEAKERNAME VARCHAR2(20),
SPEAKERADDRESS VARCHAR2(50),
SPEAKERPHONE CHAR(12),
CONSTRAINT SPEAKER_PK PRIMARY KEY(SPEAKERID));
CREATE TABLE CONFERENCESESSION(
SESSIONID CHAR(4),
BUILDINGNO CHAR(2),
ROOMNO CHAR(2),
SPEAKERID CHAR(2),
SESSIONDATE DATE,
SESSIONPRICE NUMBER(4, 2),
CONSTRAINT CONFERENCE_PK PRIMARY KEY(SESSIONID),
CONSTRAINT CONFERENCE_FK1 FOREIGN KEY(BUILDINGNO)REFERENCES BUILDING(BUILDINGNO),
CONSTRAINT CONFERENCE_FK2 FOREIGN KEY(ROOMNO) REFERENCES ROOM(ROOMNO),
CONSTRAINT CONFERENCE_FK3 FOREIGN KEY(SPEAKERID) REFERENCES SPEAKER(SPEAKERID));
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
运行以上代码时出现此错误:
表建筑物下降。
表室已删除。
错误开始于第4行:
下降表会议级联约束清除
错误报告 -
ORA-00942:表或视图不存在
00942. 00000-“表或视图不存在”
*原因:
*行动:表SPEAKER下降了。
已创建表BUILDING。
表ROOM已创建。
表SPEAKER已创建。
错误开始于第28行:
创建表会议(
SESSIONID CHAR(4),
BUILDINGNO CHAR(2),
ROOMNO CHAR(2),
SPEAKERID CHAR(2),
SESSIONDATE DATE,
会议价格(4,2),
CONSTRAINT CONFERENCE_PK主键(SESSIONID),
CONSTRAINT CONFERENCE_FK1外键(BUILDINGNO)参考建筑物(BUILDINGNO),
CONSTRAINT CONFERENCE_FK2外键(ROOMNO)参考ROOM(ROOMNO),
CONSTRAINT CONFERENCE_FK3外键(SPEAKERID)参考SPEAKER(SPEAKERID))错误报告 -
ORA-02270:此列列表没有匹配的唯一键或主键
02270. 00000-“此列列表没有匹配的唯一键或主键”
*原因:CREATE / ALTER TABLE语句中的REFERENCES子句提供了一个列列表,该列列表在被引用的表中没有匹配的唯一或主键约束。
*操作:使用ALL_CONS_COLUMNS目录视图查找正确的列名称
有什么帮助吗?
CONSTRAINT CONFERENCE_FK2 FOREIGN KEY(ROOMNO) REFERENCES ROOM(ROOMNO)
:外键必须引用另一个表的整个主键(或唯一键)。 因此,只需添加buildingno:
CONSTRAINT CONFERENCE_FK2 FOREIGN KEY(BUILDINGNO, ROOMNO) REFERENCES ROOM(BUILDINGNO, ROOMNO)
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