SQL Server索引的正确使用标准是啥样？
索使用啥样复制select stor_name from stores where city = Frederick and state = MD and zip = 21702 select stor_name from stores where city = Frederick and state = MD and zip = 21702 Sql代码 select stor_name from stores where city = Frederick and state = MD select stor_name from stores where city = Frederick and state = MD Sql代码 select stor_name from stores where city = Frederick and zip = 21702 select stor_name from stores where city = Frederick and zip = 21702 1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.
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