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reverse keys造句

"reverse keys"是什么意思   

例句與造句

  1. Reverse key index cannot be used for range scan
    回復(fù):建了反向索引,為什么系統(tǒng)不使用索引了?
  2. Current reversing key
    電流換向開關(guān)
  3. In a quick test on a table with 100 , 000 rows loaded using a sequence , a normal index was used for most queries returning up to 30 rows , as was the reverse key index , however , when the number of rows went up to 1 , 000 , 000 the reverse key index was never used and a full table scan was used every time
    在一個(gè)用一個(gè)序列載入并含100 , 000行的表上做一個(gè)快速的測試,分別用普通索引和逆序索引查詢并返回30行數(shù)據(jù),當(dāng)行數(shù)增長到1 , 000 , 000 ,將不再使用逆序索引而是每次使用全表掃描。
  4. It's difficult to find reverse keys in a sentence. 用reverse keys造句挺難的

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