This conversion improves performance when the CHAR and the VARCHAR types are present in one table.
当在同一张表中同时存在CHAR和varchar类型时，这一转换会提高性能。
2
Ideally, you should try to avoid character conversions to improve performance by using the same code pages between the source and the target of the conversion.
理想情况下，您应通过在转换的源和目标之间使用相同的代码页，尽力避免字符转换以提高性能。
3
Tracking Conversions and measuring success: Defining KPI's (Key Performance Indicator), tracking conversion, and measuring success are ultimately the fundamentals for any promotion strategy.