building cost index

基本解释

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,Engineering News-Record簡稱ENR是美國建築行業的周刊襍志是建築行業使用的指數
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.
如果內部表沒有索引，那麽數據庫服務器就會將在表上搆建索引的成本與連續掃描的成本進行比較，然後選擇成本最低的那一種方法。