nonunique

基本解釋

Global prefixed indexes can be unique or nonunique.
全局前綴索引（globalprefixedindex）可以是唯一的或非唯一的。
The assignment of pitch target is nonunique,and a ...
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Modifies more than one row and also updates the key of a nonunique clustered index to a nonconstant value.
修改多行并且還將非唯一的聚集索引的鍵更新為非常量值。
If the nonclustered index is nonunique, the data row locator is combined with the nonclustered index key to produce a unique key value for every row.
如果非聚集索引不是唯一的,數(shù)據(jù)行定位符將與非聚集索引鍵組合使用,以便為每一行生成唯一的鍵值。
For a nonunique index, the rowid is included in the key in sorted order, so nonunique indexes are sorted by the index key and rowid.
在沒有索引的情況下，你獲取一個(gè)值，必須對(duì)數(shù)據(jù)做一個(gè)有順序的掃描。