doubt in sql server -datetime comparison

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hi
in sqlserver,i created the table with orderdate as datetime.now i want to
separate the date only and also i want to compare with system date. during
comparison, if it exceeds 12 months ,service charges to be paid.

C#

protected void Button1_Click(object sender, EventArgs e)
   {

       int result;
       cmd = new SqlCommand(" SELECT DATEDIFF(mm,"+DropDownList1.SelectedValue.ToString()+","+System.DateTime.Now.ToString()+") from productorder where email='"+Session["username"]+"'",con);
       result = cmd.ExecuteNonQuery();

   }

Posted 16-Feb-11 1:37am

dhanyasri

Updated 16-Feb-11 1:38am

Sunasara Imdadhusen

v2

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Sunasara Imdadhusen 16-Feb-11 7:38am

Added code formatting!

Sunasara Imdadhusen 16-Feb-11 7:39am

Now, what is your problem?

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Om Prakash Pant · Answer 1 · 2011-02-16T02:28:00

Solution 1

If you want to select data which is more than 12 months then you can do the following:
SQL

select * from table_name where datediff(month, your_table_date_field, getDate()) > 12

Posted 16-Feb-11 2:28am

Om Prakash Pant

Updated 16-Feb-11 6:03am

v2

E.F. Nijboer · Answer 2 · 2011-02-16T02:29:00

You now select the difference in months between the date in the DropDownList and now if the user email exists in product order. So, it could work but the remember that the dates (as far as shown here) are not from the database.

It would probably be more safe to check it directly with the date in the database instead of the date given in the DropDownList1. Also, I wouldn't encourage inline sql and recommend using a stored procedure.

Good luck!

dontumindit · Answer 3 · 2011-02-16T10:23:00

in database it would have stored like this

2/17/2011 2:11:51

you can see that there is a space between time stamp and date stamp

you can use split function to convert it to array like this Unknown size Numeric Arrays from Strings - dontumindit[^]

or for builtin function see this

DATEDIFF (Transact-SQL)[^]

doubt in sql server -datetime comparison

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