關於「PK unique」標籤，搜尋引擎有相關的訊息討論：

23.6.1 Partitioning Keys, Primary Keys, and Unique Keys - MySQL ...(This also includes the table's primary key, since it is by definition a unique key. This particular case is discussed later in this section.) For example, each of the ...Creating IndexesTo enable a UNIQUE or PRIMARY KEY constraint, thus creating an associated index, the owner of the table must have a quota for the tablespace intended to ...Unique Constraints and Check Constraints - SQL Server | Microsoft ...2017年6月27日 · Unlike PRIMARY KEY constraints, UNIQUE constraints allow for the value NULL. However, as with any value participating in a UNIQUE ...Create Unique Constraints - SQL Server | Microsoft Docs2020年3月17日 · Creating a unique constraint automatically creates a corresponding unique index . Note. See Primary key, foreign key, and unique key in Azure ...The Neonatal Immune System: A Unique Host-Microbial Interface... Invest (2016) 126:1612–20. doi:10.1172/JCI84538 Remijsen Q, Kuijpers TW, ... (2007) 195:296–302. doi:10.1086/509892 Palmer TM, Gettys TW, Stiles GL.California's Unique Geologic History and Its Role in Mineral ...May , T. W. , and McKinney , G. L. , 1981 , Cadmium , lead , mercury , arsenic , and selenium concentrations of freshwater fish , 1976-1977 , National Pesticide ...Ticket Servers: Distributed Unique Primary Keys on the Cheap ...2010年2月8日 · Ticket servers give us globally (Flickr-wide) unique integers to serve as ... use the auto-incrementing ID from that table as the primary key for all ...Township - Apps on Google Play評分 4.3 (7,963,768) · 免費 · AndroidTownship is a unique blend of city-building and farming! Build your dream town! Harvest crops at the farms, process them at your facilities, and sell goods to ...DEEMO - Apps on Google Play評分 4.7 (546,690) · 免費 · Android"Never Left Without Saying Goodbye." The world acclaimed, mobile rhythm game that's touched over 10 million players. Created by the team that brought you ...SQL UNIQUE ConstraintThe UNIQUE and PRIMARY KEY constraints both provide a guarantee for uniqueness for a column or set of columns. A PRIMARY KEY constraint automatically ...