LinqPad4 Language

 from a in Alliance_SpecialCommission_Rules join b in Alliance_SpecialCommission_TicketsResources  on a.SCRuleID equals b.SCRuleID 
    select new{
    a.AllianceID,b.ScenicName
    } 

SELECT [t0].[AllianceID], [t1].[ScenicName]
FROM [Alliance_SpecialCommission_Rules] AS [t0]
INNER JOIN [Alliance_SpecialCommission_TicketsResource] AS [t1] ON [t0].[SCRuleID] = [t1].[SCRuleID]

from a in Alliance_SpecialCommission_Rules join b in Alliance_SpecialCommission_TicketsResources on a.SCRuleID equals b.SCRuleID into joinData
    from c in joinData.DefaultIfEmpty ()
    select new{
      a.SCRuleID ,a.AllianceID,a.BusinessType,c.ScenicName, c.ResourceName 
    } 

SELECT [t0].[SCRuleID], [t0].[AllianceID], [t0].[BusinessType], [t1].[ScenicName] AS [ScenicName], [t1].[ResourceName] AS [ResourceName]
FROM [Alliance_SpecialCommission_Rules] AS [t0]
LEFT OUTER JOIN [Alliance_SpecialCommission_TicketsResource] AS [t1] ON [t0].[SCRuleID] = [t1].[SCRuleID]

var words=from word in "The quick brown fox jumps over the lazy dog".Split()
orderby word.Length
select word;

words.Dump();

var sce= from a in Alliance_SpecialCommission_Rules join b in Alliance_SpecialCommission_TicketsResources  on a.SCRuleID equals b.SCRuleID 
    select new{
    a.AllianceID,b.ScenicName
    }; 
    sce.Dump();

void Main()
{
        var classify_list = new List<Alliance_FAQ_Classify>
            {
                new Alliance_FAQ_Classify{ClassifyID =1,ClassifyName ="酒店"},
                new Alliance_FAQ_Classify{ClassifyID =2,ClassifyName ="机票"},
                new Alliance_FAQ_Classify{ClassifyID =3,ClassifyName ="团购"},
                new Alliance_FAQ_Classify{ClassifyID =5,ClassifyName ="旅游"},
                new Alliance_FAQ_Classify{ClassifyID =88,ClassifyName ="Other"}
            };
      
            classify_list.Dump();
            var info_list = new List<Alliance_FAQ_Info>
            {
                new Alliance_FAQ_Info{FAQID =1,ClassifyID =1},
                new Alliance_FAQ_Info{FAQID =2,ClassifyID =1},
                new Alliance_FAQ_Info{FAQID =3,ClassifyID =1},
                new Alliance_FAQ_Info{FAQID =4,ClassifyID =1},
                new Alliance_FAQ_Info{FAQID =5,ClassifyID =1},
                new Alliance_FAQ_Info{FAQID =6,ClassifyID =1},

                new Alliance_FAQ_Info{FAQID =7,ClassifyID =2},
                new Alliance_FAQ_Info{FAQID =8,ClassifyID =2},
                new Alliance_FAQ_Info{FAQID =9,ClassifyID =2},

                new Alliance_FAQ_Info{FAQID =10,ClassifyID =3},
                new Alliance_FAQ_Info{FAQID =11,ClassifyID =3},
                new Alliance_FAQ_Info{FAQID =12,ClassifyID =3},
                new Alliance_FAQ_Info{FAQID =13,ClassifyID =3},
                new Alliance_FAQ_Info{FAQID =14,ClassifyID =3},
                new Alliance_FAQ_Info{FAQID =15,ClassifyID =3},
                new Alliance_FAQ_Info{FAQID =16,ClassifyID =3},
                new Alliance_FAQ_Info{FAQID =17,ClassifyID =3},
                new Alliance_FAQ_Info{FAQID =18,ClassifyID =3},

                new Alliance_FAQ_Info{FAQID =19,ClassifyID =5},
                new Alliance_FAQ_Info{FAQID =22,ClassifyID =5},
                new Alliance_FAQ_Info{FAQID =19,ClassifyID =6},
                new Alliance_FAQ_Info{FAQID =22,ClassifyID =6},
                new Alliance_FAQ_Info{FAQID =19,ClassifyID =7},
                new Alliance_FAQ_Info{FAQID =22,ClassifyID =7}
            };
            info_list.Dump();
            
             //left join
            var list = from a in info_list
                       join b in classify_list on a.ClassifyID equals b.ClassifyID into joinData
                       from c in joinData.DefaultIfEmpty()
                       select new
                       {
                           a.FAQID,
                           a.ClassifyID ,
                           Name=c!=null?c.ClassifyName :""
                       };
list.Dump();

            var list2 = from a in classify_list
                        join b in info_list on a.ClassifyID equals b.ClassifyID into joinData
                        from c in joinData.DefaultIfEmpty()
                        select new
                        {
                            a.ClassifyID ,
                            a.ClassifyName ,
                            FAQID=c==null?0:c.FAQID 
                        };
                    list2.Dump();    
                        
    var words=from word in "The quick brown fox jumps over the lazy dog".Split()
    orderby word.Length
    select word;
    words.Dump();
    
    var sce= from a in Alliance_SpecialCommission_Rules join b in Alliance_SpecialCommission_TicketsResources  on a.SCRuleID equals b.SCRuleID 
        select new{
        a.AllianceID,b.ScenicName
        }; 
        sce.Dump();
        
     
}
    public class Alliance_FAQ_Info
    {
        public int FAQID { get; set; }

        public int ClassifyID { get; set; }
    }

    public class Alliance_FAQ_Classify
    {
        public int ClassifyID { get; set; }

        public string ClassifyName { get; set; }
    }