摘要:
1、in/exists/join 执行效率?答:用法select * from HK_UsersBasic where Users_ID in (select AccEmail from dbo.Core_Account)select * from HK_UsersBasic where exist... 阅读全文
摘要:
public enum Suit{ Spades, Hearts, Clubs, Diamonds}//遍历valueforeach (Suit suit in (Suit[]) Enum.GetValues(typeof(Suit))){}//遍历nameforeach(string name in Enum.GetNames(typeof(Suits))) { System.Console.WriteLine(name); }public static class EnumExtensions{ ///... 阅读全文