unique constraints 中文意思是什麼

unique constraints 解釋
unique約束
  • unique : adj. 1. 唯一的；無雙的；無比的；獨特的。2. 〈口語〉珍奇的，極好的。3. 【數，物】單價的；單值的。n. 獨一無二的人[物、事實]。adv. -ly ,-ness n.
  • constraints : 變動極限
  1. Identity columns are commonly used in conjunction with primary key constraints to serve as the unique row identifier for the table

    標識列通常與primary key約束一起用作表的唯一行標識符。
  2. Identity columns are typically used together with primary key constraints to serve as the unique row identifier for the table

    標識列通常與primary key約束一起使用，作為表的唯一行標識符。
  3. From the unique viewpoint of shannon information theory, this dissertation investigates the varying and transmission of information and uncertainty in control systems using measures of entropy, mutual information, kullback - leibler information and information rates, in time and frequency domains, respectively. several problems concerning state estimation, modeling, h control, performance limits and design constraints of control systems are addressed under this framework

    論文以有別于傳統控制理論的獨特視角? ?信息的觀點研究控制系統，採用shannon信息論中的熵、互信息、 kullback - leibler信息及相應的信息率分別考察了控制系統在時域和頻域中信息和不確定性的傳輸和變化，討論了狀態估計、模型化、 h _控制及控制系統性能極限和設計約束等領域的相關問題。
  4. Design constraints indicate anything unique in a customer environment to which the portal will need to conform

    設計限製表示門戶需要遵循的客戶環境中的特殊要求。
  5. As the only index option that applies to primary key or unique constraints is maintained for backward compatibility, but will not be documented in this manner in future releases

    記錄為適用於primary key或unique約束的唯一索引選項是為了保持向後兼容，但在未來的版本中將不會以此方式進行記錄。
  6. Primary key, foreign key, unique, and check constraints

    主鍵、外鍵、惟一性約束和檢查約束
  7. However, for a long time, due to constraints such as parochial educational theories, political influences, examinational education and imbalance in educational investment, the emotional teaching has been neglected, or even distorted. as a result, it has gradually become technologized, and lost its unique characteristics

    但長期以來，由於受偏狹的教育觀、社會政治性、應試教育和低素質的師資水平以及不夠深入的教科研等種種因素的影響，語文情感教學或受到冷落，或變形失真，或走向技術化的一面，失卻了自身的特點和優勢。
  8. Whereas our urban - tree population shares many common features with those of other cities, we do have our unique environmental constraints and development history. rather than borrowing directly from other evaluation schemes, an independent methodology has been designed to suit the local circumstances

    雖然我們市區的樹木擁有類似於其他地方城市樹木的特點，但礙于香港獨特的發展歷史和環境因素，與其直接采納他人的標準，倒不如設計一套更適合香港市區環境的方法。
  9. A table can have multiple unique constraints

    一個表可以有多個unique約束。
  10. Unique constraints visual database tools

    唯一約束（可視化數據庫工具）
  11. Columns with unique constraints or indexes

    具有唯一約束或索引的列
  12. New unique constraints are added to the data source view

    在數據源視圖中將添加一個新的唯一約束。
  13. Entity integrity enforces the integrity of the identifier columns or the primary key of a table, through unique indexes, unique constraints or primary key constraints

    實體完整性通過unique索引、 unique約束或primary key約束，強製表的標識符列或主鍵的完整性。
  14. Unique, primary key, referential, check, and functional dependency constraints are supported

    惟一約束、主鍵約束、參照約束、檢查約束和函數依賴約束在這里都受支持。
  15. You can attach multiple unique constraints to a table, whereas you can attach only one primary key constraint to a table

    可將多個唯一約束附加到表，但是只能將一個主鍵約束附加到表。
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