Alter table constraint unique

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Alter table constraint unique

In this syntax, you define the UNIQUE constraint as a column constraint. You can also define the UNIQUE constraint as a table constraint, like this: CREATE ... ,The syntax for creating a unique constraint using an ALTER TABLE statement in MySQL is: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE (column1, column2, ... column_n); ,Create unique contraint - Using an ALTER TABLE statement. The syntax for creating a unique constraint using an ALTER TABLE statement in Oracle is: ALTER ... ,The syntax for creating a unique constraint using an ALTER TABLE statement in SQL Server is: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE (column1, column2, ... column_n); table_name. ,SQL UNIQUE Constraint. The UNIQUE constraint uniquely identifies each record in a database table. ... SQL UNIQUE Constraint on ALTER TABLE. To create a ... ,SQL UNIQUE Constraint on ALTER TABLE. To create a UNIQUE constraint on the "ID" column when the table is already created, use the following SQL: MySQL ... ,2020年2月6日 — ALTER TABLE customer ADD UNIQUE (C_Id);. 替唯一鍵命名與多欄位的唯一限制: ALTER TABLE customer ADD CONSTRAINT ... ,SQL UNIQUE Constraint on CREATE TABLE. 下面的SQL ... MS Access: ALTER TABLE Persons ADD CONSTRAINT uc_PersonID UNIQUE (Id_P,LastName) ... ,2020年7月14日 — alter table Employee add constraint stu_Employee_Id unique (EID, Last_Name, First_Name);. 改變現有表格架構來「移除唯一限制」的方式:. ,2020年3月17日 — USE AdventureWorks2012; GO ALTER TABLE Person.Password ADD CONSTRAINT AK_Password UNIQUE (PasswordHash, PasswordSalt); ...

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Alter table constraint unique 相關參考資料
An Essential Guide to SQL Server UNIQUE Constraint

In this syntax, you define the UNIQUE constraint as a column constraint. You can also define the UNIQUE constraint as a table constraint, like this: CREATE ...

https://www.sqlservertutorial.

MySQL: Unique Constraints - TechOnTheNet

The syntax for creating a unique constraint using an ALTER TABLE statement in MySQL is: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE (column1, column2, ... column_n);

https://www.techonthenet.com

Oracle PLSQL: Unique Constraints - TechOnTheNet

Create unique contraint - Using an ALTER TABLE statement. The syntax for creating a unique constraint using an ALTER TABLE statement in Oracle is: ALTER ...

https://www.techonthenet.com

SQL Server: Unique Constraints - TechOnTheNet

The syntax for creating a unique constraint using an ALTER TABLE statement in SQL Server is: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE (column1, column2, ... column_n); table_name. ...

https://www.techonthenet.com

SQL UNIQUE Constraint

SQL UNIQUE Constraint. The UNIQUE constraint uniquely identifies each record in a database table. ... SQL UNIQUE Constraint on ALTER TABLE. To create a ...

http://www-db.deis.unibo.it

SQL UNIQUE Constraint - W3Schools

SQL UNIQUE Constraint on ALTER TABLE. To create a UNIQUE constraint on the "ID" column when the table is already created, use the following SQL: MySQL ...

https://www.w3schools.com

SQL UNIQUE Constraint 限制- SQL 語法教學Tutorial

2020年2月6日 — ALTER TABLE customer ADD UNIQUE (C_Id);. 替唯一鍵命名與多欄位的唯一限制: ALTER TABLE customer ADD CONSTRAINT ...

https://www.fooish.com

SQL UNIQUE 约束 - W3school

SQL UNIQUE Constraint on CREATE TABLE. 下面的SQL ... MS Access: ALTER TABLE Persons ADD CONSTRAINT uc_PersonID UNIQUE (Id_P,LastName) ...

https://www.w3school.com.cn

[SQL] SQL指令重點整理(三):SQL限制(SQL Constraint)之介紹 ...

2020年7月14日 — alter table Employee add constraint stu_Employee_Id unique (EID, Last_Name, First_Name);. 改變現有表格架構來「移除唯一限制」的方式:.

https://peimei0808.pixnet.net

建立唯一的條件約束- SQL Server | Microsoft Docs

2020年3月17日 — USE AdventureWorks2012; GO ALTER TABLE Person.Password ADD CONSTRAINT AK_Password UNIQUE (PasswordHash, PasswordSalt); ...

https://docs.microsoft.com