column constraint 中文意思是什麼

column constraint 解釋
列約束
  • column : n 1 【建築】圓柱；圓柱狀物〈如煙柱〉。2 【軍事】縱隊 （opp line）; 隊；（艦隊的）縱陣，縱列，艦列...
  • constraint : n. 1. 強迫，拘束。2. 約束，壓抑，拘泥。3. 強制力。4. 緊張感[狀態]。
  1. The case - sensitivity rule does not apply if only one column, relation, or constraint with a particular name exists

    如果某個特定名稱只存在一個列、關系或約束，則不應用區分大小寫規則。
  2. In table - valued user - defined functions, the primary key constraint can be created on only one column per table

    在表值用戶定義函數中，只能對每個表中的一列創建primary key約束。
  3. Because check constraints can reference only the columns on which the column - level or table - level constraint is defined, any cross - table constraints in this case, business rules must be defined as triggers

    由於check約束只能引用定義了列級或表級約束的列，表間的任何約束（在本例中是業務規則）都必須定義為觸發器。
  4. Disabled validate - > modification of the constraint column is not allowed

    修改記錄欄位造成約束不合法？
  5. The matching column from the primary table is a primary key or has a unique constraint

    來自主鍵表的匹配列是主鍵或具有唯一約束。
  6. Is a constraint that enforces domain integrity by limiting the possible values that can be entered into a column or columns

    一個約束，該約束通過限制可輸入一列或多列中的可能值來強制實現域完整性。
  7. For example, you may want the primary key constraint of the table to reference other columns, or you may want to change the column order, index name, clustered option, or fill factor of the primary key constraint

    例如，可以讓表的primary key約束引用其他列，更改列的順序、索引名、聚集選項或primary key約束的填充因子。
  8. E. adding an unverified check constraint to an existing column

    E .在現有列中添加一個未經驗證的check約束
  9. When nocheck is specified, the constraint is disabled and future inserts or updates to the column are not validated against the constraint conditions

    如果指定了nocheck ，則將禁用約束，從而在將來插入或更新列時，不根據約束條件進行驗證。
  10. If an update to a row violates a constraint or rule, violates the null setting for the column, or the new value is an incompatible data type, the statement is canceled, an error is returned, and no records are updated

    如果對行的更新違反了某個約束或規則，或違反了對列的null設置，或者新值是不兼容的數據類型，則取消該語句、返回錯誤並且不更新任何記錄。
  11. To meet the conditions of the partitioned view, there should be only one partitioning constraint on the partitioning column

    若要滿足分區視圖的條件，在分區列上應只有一個分區約束。
  12. The value being inserted into the partitioning column should satisfy at least one of the underlying constraints ; otherwise, the insert action will fail with a constraint violation

    插入到分區列中的值應至少滿足一個基礎約束；否則，插入操作將因違反約束而失敗。
  13. A boolean value indicating a unique constraint on the column

    指示列上的唯一約束的布爾值。
  14. Specifies whether a unique constraint applies to this column

    指定是否有唯一的約束應用於此列。
  15. Is a constraint that enforces entity integrity for a specified column through a unique index

    一個約束，該約束通過唯一索引來強制指定列的實體完整性。
  16. Is a constraint that provides entity integrity for a specified column or columns by using a unique index

    通過唯一索引為指定的一列或多列提供實體完整性的約束。
  17. Is a constraint that enforces entity integrity for a specified column or columns by using a unique index

    通過唯一索引對指定的一列或多列強制實體完整性的約束。
  18. Unique is a constraint that provides entity integrity for a specified column or columns through a unique index

    一個約束，該約束通過唯一索引為一個或多個指定列提供實體完整性。
  19. F. adding a default constraint to an existing column

    F .在現有列中添加一個default約束
  20. If no default constraint is defined for the column, this function sets the column to null. an exception is thrown if the row is not marked as updatable

    如果沒有為該列定義默認的約束，此函數便將該列設置為空引用（在visual basic中為nothing ） 。
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