How To write an SQL query to return all “historical records” for TODAY'S DATE (month and day) for EVERY YEAR in the DB?

Question

I've been using Visual Studio, C#, and SQL Server for 8 months now and have created a very functional personal project as I've been learning. But, there one bit of functionality I want in my program that I cannot get to work--automatically, that is.

If I type THIS into the button click event, run the program, and click the History button, it works perfectly. All seven columns of information go to the datagridview perfectly.

SqlDataAdapter sda = new SqlDataAdapter("SELECT * FROM AllConcertList WHERE Date LIKE '%%%%-05-27' ORDER BY DATE DESC; ", conn);

However, what is not awesome is that I want to write the query so that I can push a button ("History") that will return information from MAY 27 (or whatever today's date actually is) of EVERY YEAR, and I just can't figure out how to do it. It is a "Happened On This Day In History" list.

Obviously, I need to keep SELECT * FROM AllConcertList WHERE Date ... Somehow I need to include GETDATE() otherwise how would the program know to start with 05-27? But then I feel I need to include DATEFROMPARTS because I only really want Month and Day to be static to whatever the actual date (today) is. It must be a subquery in there somehow.

Answer 1

You should be able to use with simple month() and day() functions based on whatever the system's GETDATE() value is. Is this what you are looking for?

select 
      ACL.* 
   from 
      AllConcertList ACL
   where 
          month( ACL.Date ) = month( getdate()) 
      and day( ACL.Date ) = day( getdate())
   order by
      ACL.Date desc

No Parameters, no sql-injection

Answer 2

You can dynamically get today's month and date, then build your query string.

DateTime today = DateTime.Today;
String sql = String.Format("SELECT * FROM AllConcertList WHERE Date LIKE '%%%%-{0}' ORDER BY DATE DESC;", today.ToString("MM-dd"));
SqlDataAdapter sda = new SqlDataAdapter(sql, conn);

And to show best practice, the same query, but parameterized.

DateTime today = DateTime.Today;
SqlCommand cmd =  new SqlCommand("SELECT * FROM AllConcertList WHERE Date LIKE @monthDate ORDER BY DATE DESC;", conn);
cmd.Parameters.AddWithValue("@monthDate", "%%%%-" + today.ToString("MM-dd"));