[英]The column in table 'Users' do not match an existing primary key or unique constraint
I have two tables, 'Users' and 'IssueBooks'.我有两个表,'Users' 和'IssueBooks'。 In both the tables, I have ADMIN_ID,USN and E_ID as columns.
在这两个表中,我都将 ADMIN_ID、USN 和 E_ID 作为列。
When I try to connect Users Table to IssueBooks Table making those columns foreign key, this error pops up:-当我尝试将用户表连接到使这些列成为外键的 IssueBooks 表时,会弹出此错误:-
The column in table 'Users' do not match an existing primary key or unique constraint
All three columns are primary key and I want them to be foreign key in IssueBooks table.所有三列都是主键,我希望它们是 IssueBooks 表中的外键。
All these columns are spelled same in both the tables.所有这些列在两个表中的拼写相同。
It means that Users is having a combination not present in the parent table IssueBooks
.这意味着 Users 具有父表
IssueBooks
不存在的组合。 Figure out the value and update it accordingly.找出值并相应地更新它。
SELECT ADMIN_ID, USN, E_ID
FROM Users AS uo
WHERE NOT EXISTS (SELECT 1 FROM IssueBooks
WHERE ADMIN_ID = uo.ADMIN_ID
AND USN = uo.USN
AND E_ID = uo.E_ID)
Users
:Users
的组合:UPDATE Users
SET ADMIN_ID = <newvalue>,
USN = <newvalue>,
E_ID = <newvalue>
WHERE ADMIN_ID = <oldvalue>
AND USN = <oldvalue>
AND E_ID = <oldvalue>
or或者
DELETE Users
WHERE ADMIN_ID = <oldvalue> AND USN = <oldvalue> AND E_ID = <oldvalue>
Users
table:Users
表中相应地创建外键:ALTER TABLE Users
ADD CONSTRAINT FK_Users_issueBooks
FOREIGN KEY (ADMIN_ID, USN, E_ID)
REFERENCES IssueBooks(ADMIN_ID, USN, E_ID)
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