Need Help with SQL Server (Indexes)

use index_examples; go create table index_example( id bigINT NOT NULL IDENTITY PRIMARY KEY, first_name nvarchar(30), Last_name nvarchar(30), birthday date); use index_examples; go declare @FromDate date = '1990-01-01', @ToDate date = '2011-12-31', @rdate DATE; BEGIN insert into index_example(first_name, last_name, birthday) SELECT c1.First_Name, c2.Last_Name,dateadd(day,rand(checksum(newid()))*(1+datediff(day, @FromDate, @ToDate)), @FromDate) FROM dbo.raw_data c1 cross join dbo.raw_data c2; END