關於「Foreign key 意思」標籤，搜尋引擎有相關的訊息討論：

SQL 外來鍵- 1Keydata SQL 語法教學外來鍵是一個(或數個)指向另外一個表格主鍵的欄位。

外來鍵的目的是確定資料的參考完整性(Referential Integrity)。

換言之，只有被准許的資料值才會被存入資料庫 ...建立外部索引鍵關聯性- SQL Server | Microsoft Docs2020年6月19日 · FOREIGN KEY 條件約束只能參考在相同伺服器之相同資料庫內的資料表。

FOREIGN KEY constraints can reference only tables within the same ...Primary and Foreign Key Constraints - SQL Server | Microsoft Docs2017年7月25日 · A foreign key (FK) is a column or combination of columns that is used to establish and enforce a link between the data in two tables to control the ...3.3. 外部索引鍵- PostgreSQL 正體中文使用手冊DETAIL: Key (city)=(Berkeley) is not present in table "cities". 外部索引鍵或簡稱外部鍵（foreign key）的行為可以讓你的應用程式變得 ...SingPass Mobile - Google Play 上的应用評分 4.3 (17,739) · 免費 · AndroidLog in within seconds using your fingerprint or 6-digit passcode. KEY FEATURES - View your government-verified data in one place. With the new MyInfo Profile ...外鍵可以引用同一表中的主鍵嗎？ stackoverflow I18n StackCan a foreign key refer to a primary key in the same table? 我只是認為 ... 如果你的意思是“在同一個表中，列（或一組列）可以同時是主鍵還是外鍵？”在我看來， ...Defining a foreign key - IBM Knowledge CenterUse foreign keys to enforce referential relationships between tables. A foreign key is a column or set of columns that references the parent key in the parent table ...SQL FOREIGN KEY ConstraintA FOREIGN KEY in one table points to a PRIMARY KEY in another table. Let's illustrate the foreign key with an example. Look at the following two tables:.Read Primary-Foreign Key - MicroStrategyThe Read the table Primary and Foreign Keys setting displays the columns that are defined as primary keys or foreign keys in the data source. Primary keys and  ...TW - 82 - Site NamePDO/MySQL使用if語句獲取多個列 · 查詢ForeignKey的Django對象列表 · Rails 3.2 嵌套表單自定義外 ... 2.7.1,但是不起作用 · 從Mapbox GL JS矢量源獲取/列出源層 · 垂直對齊和垂直對齊在桌子上不起作用! ... 說let聲明被懸掛但未初始化是什麼意思?