Index Unique Scan (213)
Index unique scan is one of the most efficient ways of accessing data. This access
method is used for returning the data from B-tree indexes. The optimizer chooses a
unique scan when all columns of a unique (B-tree) index are specified with equality
conditions.
索引唯一掃描
當一個唯一索引的某些與查詢體條件表示式相等時，最佳化器將選擇使用索引唯一掃描
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/10599713/viewspace-982881/，如需轉載，請註明出處，否則將追究法律責任。
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