Question

下面的示例表Stream_types给出了一个错误：没有唯一约束匹配给定引用表的键，并且已经盯着它，而现在我无法弄清楚在这种情况下出现此错误的原因。

create table Stream_types (
id integer NOT NULL,
career careertype NOT NULL,
code character(1) NOT NULL,
description shortstring NOT NULL
);

create table Streams (
id          integer, -- PG: serial
code        char(6) not null, -- e.g. COMPA1, SENGA1
name        LongName not null,
offeredBy   integer references OrgUnits(id),
stype       ShortString references Stream_types(id),
description TextString,
firstOffer  integer references Semesters(id), -- should be not null
lastOffer   integer references Semesters(id), -- null means current
primary key (id)
);

错误是：

ERROR:  there is no unique constraint matching given keys for referenced table "stream_types"
********** Error **********

ERROR: there is no unique constraint matching given keys for referenced table "stream_types"
SQL state: 42830

我使用postgresql 9.3.16，有人可以帮我解决这个问题吗？

Answer 1

更改create table Stream_types语句，如下所示：

create table Stream_types (
  id integer NOT NULL PRIMARY KEY,
  career careertype NOT NULL,
  code character(1) NOT NULL,
  description shortstring NOT NULL
);

错误：没有唯一约束匹配给定引用表的键＃34; stream_types＆＃34;

1 个答案: