關於「SQL UNIQUE key」標籤，搜尋引擎有相關的訊息討論：

SQL UNIQUE Constraint - W3SchoolsHowever, you can have many UNIQUE constraints per table, but only one PRIMARY KEY constraint per table. SQL UNIQUE Constraint on CREATE TABLE. The following SQL ...缺少字詞： gl= twCreate Unique Constraints - SQL Server | Microsoft Docs2020年3月17日 · Requires ALTER permission on the table. Using SQL Server Management Studio. To create a unique constraint. In Object Explorer, right-click the ...缺少字詞： gl= | 必須包含以下字詞：gl=Create Unique Indexes - SQL Server | Microsoft Docs2017年2月17日 · A unique index guarantees that the index key contains no duplicate values and therefore every row in the table is in some way unique. There are ...缺少字詞： gl= | 必須包含以下字詞：gl=Difference between Primary Key and Unique Key - DotNetTricks2012年9月26日 · In SQL Server, we have two keys - primary key and unique key which distinctively or uniquely identify a record in the database.Different Types of SQL Keys - DotNetTricks2011年1月27日 · Example: Primary key, Unique key, Alternate key are a subset of Super Keys. Candidate Key. A Candidate Key is a set of one or more fields/ ...Constraints in SQL Server | What is SQL constraints - Great Learning2021年6月8日 · Column Level Constraints include: UNIQUE Constraint; CHECK Constraint; PRIMARY KEY Constraint; FOREIGN KEY Constraint; INDEX Constraint. Let us ...Unique Constraint | CockroachDB DocsThe UNIQUE constraint specifies that each non- NULL value in the constrained column must be unique. Details. You can insert NULL values into columns with ...缺少字詞： gl= twComputerworldWork with customers to define business requirements to bridge gap b/tw ... by Unique Vacations, Inc., a travel management marketing firm in Miami, FL.Service Oriented Mapping 2012LH fl" I'm-"ll nrwlnlflu Y:i'-r'53||¢-fln:_flur\\ u.I'-r-\. ... The links between tables are implemented by primary and secondary keys and they are in a ...ComputerworldBut in the future, I tw l l l l 1 ated. ... systems director Steve McGrady NT operating system and SQL Server 6 database on a Digital Equipment Corp.