问题描述:给表创建外键报错ORA-00906,具体过程如下: 数据库:oracle 11.2.0.464位 scott@ORCL2022-10-18 19:10:40> selectindex_name,table_name,tablespace_name,status,last_analyzed from user_indexes; INDEX_NAME TABLE_NAME TABLESPACE_NAME STATUS LAST_ANALYZED ------------------------------ --------------- -------- ------------------- PK_EMP EMP USERS VALID 2022-10-11 22:00:04 PK_DEPT DEPT USERS VALID 2022-10-11 22:00:04 scott@ORCL2022-10-18 19:10:48> select * from app1_emp; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO -------------------- --------- ---------- ------------------- ---------- -------------------- 7369 SMITH CLERK 7902 1980-12-1700:00:00 800 20 7499 ALLEN SALESMAN 7698 1981-02-20 00:00:00 1600 300 30 7521 WARD SALESMAN 7698 1981-02-22 00:00:00 1250 500 30 7566 JONES MANAGER 7839 1981-04-02 00:00:00 2975 20 7654 MARTIN SALESMAN 7698 1981-09-28 00:00:00 1250 1400 30 7698 BLAKE MANAGER 7839 1981-05-01 00:00:00 2850 30 7782 CLARK MANAGER 7839 1981-06-09 00:00:00 2450 10 7788 SCOTT ANALYST 7566 1987-04-19 00:00:00 3000 20 7839 KING PRESIDENT 1981-11-17 00:00:00 5000 10 7844 TURNER SALESMAN 7698 1981-09-08 00:00:00 1500 0 30 7876 ADAMS CLERK 7788 1987-05-23 00:00:00 1100 20 7900 JAMES CLERK 7698 1981-12-03 00:00:00 950 30 7902 FORD ANALYST 7566 1981-12-03 00:00:00 3000 20 7934 MILLER CLERK 7782 1982-01-23 00:00:00 1300 10 14 rowsselected. scott@ORCL2022-10-18 19:17:45> alter table app2_dept add constraint PK_Test_ID primarykey(deptno); scott@ORCL2022-10-18 19:51:22> alter table app1_emp add constraint fk_app1_deptnoforeign key references app2_dept(deptno); altertable app1_emp add constraint fk_app1_deptno foreign key referencesapp2_dept(deptno) * ERROR atline 1: ORA-00906:missing left parenthesis scott@ORCL2022-10-18 19:53:27> alter table app1_emp add constraint fk_app1_deptnoforeign key (deptno) references app2_dept(deptno); Tablealtered. 总结:创建语句不正确导致,修改后成功创建外键.
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