unique index 中文意思是什麼
unique index
解釋
唯一索引-
A unique index has the greatest selectivity
唯一索引具有最高的選擇性。 -
If an attempt is made to enter data for which there is a unique index and the ignore dup key clause is set to on, only the rows violating the unique index fail
如果在存在唯一索引並且ignore _ dup _ key子句設置為on的情況下輸入數據，則只有違反unique索引的行才會失敗。 -
The sql server 2005 database engine does not allow creating a unique index on columns that already include duplicate values, whether or not ignore dup key is set to on
無論ignore _ dup _ key是否設置為on ， sql server 2005數據庫引擎都不允許為已包含重復值的列創建唯一索引。 -
Table as well, we can skip this field, since eco itself will add unique index fields to identify class instances
表也使用這個欄位，我們可以跳過這個欄位，因為eco本身將添加惟一索引欄位來識別類實例。 -
Because index names are not unique within each database,
由於索引名稱在每個數據庫中不是唯一的，因此必須指定 -
Nonzero full - text catalog id, associated with the unique index that identifies the rows in a full - text indexed table
非零=全文目錄id ，它與全文索引表中標識行的唯一索引相關。 -
If the index enforces a primary key or unique constraint and the index definition is not altered in any way, the index is dropped and re - created preserving the existing constraint
如果索引強制primary key或unique約束，且索引定義沒有任何改變，則會刪除並重新創建該索引並保留現有約束。 -
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。 -
Owing to their unique optical properties, such as low loss and large refractive index difference between silicon and silicon oxide, soi structures can not only be used to fabricate smart integrate photonic devices, but offer the ability to integrate photonic devices into the cmos integrated circuit ( ic ) process
同時，它也具備許多優越的光學特性，比如低損耗（在通信波段） 、高折射率差，這使得它不但能用來製作靈巧緊湊的光集成器件，也為利用cmos微電子工藝實現光電集成提供了一個很好的平臺。 -
Silica gels have lots of unique capabilities, nicer heat - insulating property, low density with porous structure, good transparency, low reflect index, nice mechanical elasticity, big surface area, for instance. these properties made it to be applied in many fields as optics, catalysis, sensor, high - energy physics, mechanism and so on
二氧化硅（ sio _ 2 ）凝膠具有許多獨特的性能，如良好的絕熱性，密度低且具有多孔結構，透明性好，反射指數低，機械彈性好，表面積大等，使其在光學、催化、傳感、高能物理、機械等領域獲得了廣泛應用。 -
Creating a unique clustered index on a view improves query performance because the view is stored in the database in the same way a table with a clustered index is stored
為視圖創建唯一聚集索引可以提高查詢性能，因為視圖在數據庫中的存儲方式與具有聚集索引的表的存儲方式相同。 -
An index on a view materializes executes, the view and the result set is permanently stored in a unique clustered index in the same way a table with a clustered index is stored
視圖的索引將具體化（執行）視圖，並將結果集永久存儲在唯一的聚集索引中，而且其存儲方法與帶聚集索引的表的存儲方法相同。 -
The error raised is similar to : cannot insert duplicate key row in object msmerge contents with unique index ucl1syccontents
中進行插入時也會發生此錯誤；引發的錯誤類似：不能在具有唯一索引「 ucl1syccontents 」的對象「 msmerge _ contents 」中插入重復鍵的行。 -
Will fabricate a name based on the short type name combined with an index number to make it unique
將基於與索引編號合併的短類型名稱生成名稱，以使該名稱唯一。 -
Unique index design guidelines
唯一索引設計指南 -
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。 -
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。 -
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。 -
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。 -
If the query references at least one table without a unique index, the keyset cursor is converted to a static cursor
如果查詢引用了至少一個無唯一索引的表，則鍵集游標將轉換為靜態游標。
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