different, distinct, diverse have the same meaning. Latin dis+ ferre means when you say it of a forking path to lead in different directions. ... <看更多>

According to the MSDN documentation on COUNT : DISTINCT Specifies that COUNT returns the number of unique nonnull values. SELECT DISTINCT , on the other ... ... <看更多>

The terms unique and distinct are sometimes used interchangeably; however, they have different meanings. In this tutorial, you'll learn the ... ... <看更多>