我有 2 张 table ,Facilities
和 Services
.
CREATE TABLE Facilities (
facility_id NUMBER(2) NOT NULL,
facility_name VARCHAR2(20) NOT NULL,
CONSTRAINT pk_facil_id PRIMARY KEY (facility_id)
);
CREATE TABLE Services (
service_id NUMBER(2) NOT NULL,
service_name VARCHAR(20) NOT NULL,
service_facility NUMBER(2) NOT NULL,
CONSTRAINT pk_serviceid PRIMARY KEY (service_id)
);
ALTER TABLE Services
add CONSTRAINT fk_servicefacility FOREIGN KEY(service_facility)
REFERENCES Facilities(facility_id);
如果我尝试将记录输入到“服务”表中,如下所示:
INSERT INTO Services (service_id, service_name, service_facility)
SELECT 06, 'Rooms',
(SELECT facility_id, FROM Facilities WHERE facility_name = 'Hotel')
FROM Dual;
对于 7 个插入语句中的 3 个,我收到错误“缺少表达式”。缺少什么表达?
最佳答案
您发布的 SQL 语句有一个额外的逗号。如果您在 SQL*Plus 中运行该语句,它将抛出 ORA-00936: missing expression 并准确显示错误发生的位置
SQL> ed
Wrote file afiedt.buf
1 INSERT INTO Services (service_id, service_name, service_facility)
2 SELECT 06, 'Rooms',
3 (SELECT facility_id, FROM Facilities WHERE facility_name = 'Boston')
4* FROM Dual
SQL> /
(SELECT facility_id, FROM Facilities WHERE facility_name = 'Boston')
*
ERROR at line 3:
ORA-00936: missing expression
如果删除逗号,则该语句有效
SQL> ed
Wrote file afiedt.buf
1 INSERT INTO Services (service_id, service_name, service_facility)
2 SELECT 06, 'Rooms',
3 (SELECT facility_id FROM Facilities WHERE facility_name = 'Boston')
4* FROM Dual
SQL> /
1 row created.
但是请注意,我通常更喜欢 Stefan 的语法,您可以从
Facilities
中进行选择。而不是从 dual
中选择带有标量子查询。
关于sql - 语法错误 : missing expression (ORA-00936),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10440306/