create unique key sql server
建立UNIQUE 條件約束與建立獨立於條件約束之外的唯一索引，兩者並無明顯差異。 ... 建立PRIMARY KEY 條件約束時，若資料表上沒有存在叢集索引，而且您未指定唯一 ... 如需詳細資訊，請參閱CREATE INDEX (Transact-SQL)。, UNIQUE 和CHECK 是兩種類型的條件約束，可用來強制執行SQL ServerSQL ... 雖然UNIQUE 條件約束和PRIMARY KEY 條件約束兩者都強制唯一性，但是當您想要 .... CREATE TABLE CheckTbl (col1 int, col2 int); GO CREATE ...
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 create unique key sql server 相關參考資料
建立唯一的條件約束- SQL Server | Microsoft Docs
Password ADD CONSTRAINT AK_Password UNIQUE ... 如需詳細資訊，請參閱ALTER TABLE (Transact-SQL)、CREATE TABLE (Transact-SQL) ... https://docs.microsoft.com 建立唯一索引- SQL Server | Microsoft Docs
建立UNIQUE 條件約束與建立獨立於條件約束之外的唯一索引，兩者並無明顯差異。 ... 建立PRIMARY KEY 條件約束時，若資料表上沒有存在叢集索引，而且您未指定唯一 ... 如需詳細資訊，請參閱CREATE INDEX (Transact-SQL)。 https://docs.microsoft.com 唯一條件約束與檢查條件約束- SQL Server | Microsoft Docs
UNIQUE 和CHECK 是兩種類型的條件約束，可用來強制執行SQL ServerSQL ... 雖然UNIQUE 條件約束和PRIMARY KEY 條件約束兩者都強制唯一性，但是當您想要 .... CREATE TABLE CheckTbl (col1 int, col2 int); GO CREATE ... https://docs.microsoft.com CREATE INDEX (Transact-SQL) - SQL Server | Microsoft Docs
Create a nonclustered index on a table or view CREATE INDEX i1 ON t1 ... Database -- Create a nonclustered index with a unique constraint ... https://docs.microsoft.com SQL UNIQUE Constraint - W3Schools
The following SQL creates a UNIQUE constraint on the "ID" column when the "Persons" table is created: SQL Server / Oracle / MS Access: CREATE TABLE ... https://www.w3schools.com How can I create a unique constraint on my column (SQL Server 2008 ...
Set column as unique in SQL Server from the GUI: Open SQL Server Management Studio. Right click your Table, click "Design". Right click the column you want to edit, a popup menu appears, cl... https://stackoverflow.com What Is a UNIQUE Constraint in a SQL Server? - Lifewire
By creating a UNIQUE constraint, SQL Server administrators specify that a database column may not contain duplicate values. When you ... https://www.lifewire.com An Essential Guide to SQL Server UNIQUE Constraint
This tutorial shows you how to use the SQL Server UNIQUE constraint to ensure the ... The following statement creates a table whose data in the email column is ... http://www.sqlservertutorial.n SQL Server: Unique Constraints - TechOnTheNet
This SQL Server tutorial explains how to create, add, and drop unique constraints in SQL Server with syntax and examples. A unique constraint is a single field ... https://www.techonthenet.com How to set a unique key in SQL server? - Quora
There are three ways: 1) creating Unique Key using Transact-SQL on [code ]CREATE TABLE[/code]: [code]CREATE TABLE contact ( id int NOT NULL IDENTITY ... https://www.quora.com |