### Instruction: CREATE TABLE employeedetails (EmployeeId numeric,UserId int,UserName varchar,EmpCode varchar,title varchar,FirstName nvarchar,MiddleName nvarchar,FatherName varchar,Phone nvarchar,CellPhone nvarchar,
IsMobileNumberPublic bit,OfficePhone nvarchar,Extension varchar,Email nvarchar,IsEmailIdPublic bit,AlternateEmailId varchar,QuitDate datetime,DeptName varchar,DesignationName varchar,Religion varchar,Nationality varchar,PlaceOfBirth nvarchar,BirthDate datetime,JoiningDate datetime,Gender varchar,HousePhone nvarchar,MaritalStatusName varchar,BranchName varchar,ReportingManagerName nvarchar,EmployeeGrade int,IsEmployeeExit bit,ExitDate datetime,ReasonToLeave nvarchar,IsLeavedJob bit,SocialSecurityNo nvarchar,LeaveJobDate datetime,Status int,CreatedOn datetime,UpdatedOn datetime,PFNo nvarchar,ESINo nvarchar,CTC decimal,CreatedMachineIP varchar,UpdatedMachineIP varchar,IsTDSapplicable bit,GrossPay decimal,WorkerType int,EmpExitType nvarchar,JobLevelName varchar,companyid int,branchid int)
CREATE TABLE Ex_ReimbursementRequest_details (Rr_SysCode INT, RF_ID INT, CompanyID INT, BranchID INT, DepartmentID INT, DesignationID INT, ReimbursementTypeID INT, Reimbursement_Cat NVARCHAR, FromDate DATETIME, Todate DATETIME, PolicyAllocationID INT, Particular NVARCHAR, source NVARCHAR, Destination NVARCHAR, Kilometer INT, FuelType NVARCHAR, CityCategoryTypeID INT, ReimbursementAmount DECIMAL, Status INT, FileNames NVARCHAR, FilePath NVARCHAR, Filetype NVARCHAR, CreatedById INT, UserName NVARCHAR, CreatedOn DATETIME, CreatedByMachinIP NVARCHAR, UpdatedById INT, UpdatedOn DATETIME, UpdatedByMachinIP NVARCHAR) --Using valid MS SQL Server, answer the following questions for the tables provided above. -- List the reimbursement types that have the highest frequency of requests. 
### Response: SELECT Reimbursement_Cat AS [Reimbursement Category], isnull(COUNT(*),0) AS [Number of Reimbursements] FROM Ex_ReimbursementRequest_details as rrd left join Employeedetails e ON rrd.UserName = e.UserName GROUP BY Reimbursement_Cat ORDER BY [Number of Reimbursements] DESC