有一个通常的误解,觉得应该把选择性高的字段放在最前面,这通常只是针对一个字段的索引,对于组合索引,常常要把做等式运算的字段放在最前面,看看测试 USE AdventureWorks
GOCREATE TABLE demo1
( id INT identity(1,1)…
原文下载地址Improved media support Low Latency Audio Playback: Use the SoundEffect API to trigger low-latencysound Variable Speed Playback: allows video to be played at different speedsand supports fast-forward and rewind. At up to twice th…