Calculate sum based on different dates -


i'm new stackoverflow , need problem. have table (sql 2014 , use vb.net) this:

id  codfisc  dal         al 1   xxxxxxx  2017/08/08  2017/08/14

i have developed code:

dim date = date.parse(textbox2.text)     dim b date = date.parse(textbox3.text)     dim source2 string = webconfigurationmanager.connectionstrings("connectionstring").connectionstring     dim sql2 string = "select sum(datediff(day, dal, al)+1) total tab1 codfisc = @codfisc , dal >=@dal , al <=@al"     dim conn2 new sqlconnection(source2)     conn2.open()     dim cmd2 new sqlcommand(sql2, conn2)     cmd2.parameters.addwithvalue("@codfisc", me.gridview1.selectedrow.cells(8).text)     cmd2.parameters.addwithvalue("@dal", a)     cmd2.parameters.addwithvalue("@al", b)     dim dr2 sqldatareader     dr2 = cmd2.executereader()     while dr2.read()          textbox4.text = dr2("total").tostring()          if isdbnull(dr2("total"))             textbox4.text = "0"         end if       end while      conn2.close()

so if search 2017/08/08 2017/08/14, textbox4.text=7 , correct! if search 2017/08/08 2017/08/13 textbox4.text=0 instead of textbox4.text=6!!

thank everyone.


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