我使用了SQL Fiddle程序，它不断告诉我该表不存在，我该怎么做以修复两个互相引用的表？

Question

人员表引用分支表

CREATE TABLE Staff(
StaffNo VARCHAR(5) NOT NULL,
firstName VARCHAR(15) NOT NULL UNIQUE,
lastName VARCHAR(15) NOT NULL,
position VARCHAR(10) NOT NULL,
salary INTEGER
DEFAULT 3000,
CHECK (salary BETWEEN 3000 AND 25000),
email VARCHAR(25),
branchNo CHAR(6) NOT NULL,
PRIMARY KEY (StaffNo),
FOREIGN KEY (branchNo) REFERENCES Branch (branchNo));

同时分支表引用了Staff表

create table Branch(
branchNo char(6) not null primary key,
street varchar(30) not null,
city varchar(20),
postCode char(5) not null,
ManagerNo varchar(5) not null,
foreign key (ManagerNo) references Staff(StaffNo)); 

Answer 1

由于您的表在外键中相互引用，因此如果尚未创建另一个表，则在创建任何一个表时都会出现错误。我建议您删除FOREIGN KEY的创建以分隔ALTER TABLE语句：

CREATE TABLE Staff(
  StaffNo VARCHAR(5) NOT NULL,
  firstName VARCHAR(15) NOT NULL UNIQUE,
  lastName VARCHAR(15) NOT NULL,
  position VARCHAR(10) NOT NULL,
  salary INTEGER
  DEFAULT 3000,
  CHECK (salary BETWEEN 3000 AND 25000),
  email VARCHAR(25),
  branchNo CHAR(6) NOT NULL,
  PRIMARY KEY (StaffNo)
);


create table Branch(
  branchNo char(6) not null primary key,
  street varchar(30) not null,
  city varchar(20),
  postCode char(5) not null,
  ManagerNo varchar(5) not null
); 

alter table staff
  add constraint fk1_branchNo foreign key (branchNo) references Branch (branchNo);

alter table branch
  add constraint fk1_ManagerNo foreign key (ManagerNo) references Staff (StaffNo);

参见带有演示的SQL Fiddle