[英]How do I add a constraint to check if value is present in another column within the same table?
我有一个这样的实体，
@Entity
@Table(name = "Persons", schema="PU")
public class Persons {
@Basic
@Column(name = "PERSON_ID")
private String personId
@Basic
@Column(name = "PERSON_NAME")
private String personName
@Basic
@Column(name = "PERSON_NAME_COPY")
private String personNameCopy
}
我想在 personNameCopy 列中添加一个约束，以便在该列中插入的任何值都应该出现在 personName 列中。
有什么办法可以做到这一点？
DROP TABLE IF EXISTS dbo.Person;
CREATE TABLE dbo.Person
(
PERSON_ID INT NOT NULL PRIMARY KEY,
PERSON_NAME VARCHAR(50)NOT NULL,
PERSON_NAME_COPY VARCHAR(50)NOT NULL,
CONSTRAINT CHK_PERSON_NAME_PERSON_NAME_COPY CHECK (PERSON_NAME=PERSON_NAME_COPY)
)
GO
INSERT dbo.Person(PERSON_ID,PERSON_NAME,PERSON_NAME_COPY)
VALUES(1,'KUMAR','KUMAR')
--THIS ROW IS TO BE REJECTED
INSERT dbo.Person(PERSON_ID,PERSON_NAME,PERSON_NAME_COPY)
VALUES(2,'JOHN','KUMAR')
SELECT *FROM DBO.Person;
如果我正确理解你的问题，你可以实施检查约束（上面的例子）请也看看https://learn.microsoft.com/en-us/sql/relational-databases/tables/create-check-constraints?view= sql-server-ver16
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