building cost index

基本解釋

In fact, for the last -this is the Engineering News-Record Building Cost Index; it's an index used by people in the construction industry.
實際上,在過去,這是ENR建築成本指數(shù),Engineering News-Record簡稱ENR是美國建築行業(yè)的周刊襍志是建築行業(yè)使用的指數(shù)
If the inner table does not have an index, the database server will compare the cost of building an index on the table to the cost of a sequential scan, and will choose the one with the least cost.
如果內(nèi)部表沒有索引，那麼數(shù)據(jù)庫服務器就會將在表上搆建索引的成本與連續(xù)掃描的成本進行比較，然後選擇成本最低的那一種方法。