vb.net - How to find the nearest value in the database -


how nearest value in database, example data in database value of:

data tested -100, how system can issue results of test -100 character a.

image

private sub button4_click(sender object, e eventargs) handles button4.click     try         dim persen string         dim nilai_banding, hasil string         dim cek = textbox1.text         dim reng_atas = cek + 15         dim reng_bawah = cek - 15         dim per = " %"         dim kuadrat = "^2"         dim pixeluji = textbox2.text         dim pixelsampel = textbox1.text         'dim c = textbox3.text          'if c > 315         'messagebox.show("jumlah pixel terlalu besar untuk di verifikasi", "informasi", messageboxbuttons.ok, messageboxicon.information)         'else          'conn.open()         dim mda new mysql.data.mysqlclient.mysqldataadapter("select citra_karakter karakter_plat pixel_putih='" & textbox1.text & "' or pixel_putih >='" & reng_atas & "' , pixel_putih >='" & reng_bawah & "'", conn)         '("select nama,tanda_tangan,nilai_hitam,jumlah_pixel,keterangan tanda_tangan nama  '%" & textbox7.text & "%'", conn)          dim dt new datatable         mda.fill(dt)         'datagridview1.datasource = datagridviewautosizecolumnmode.allcells         'datagridview1.datasource = dt          cmd = new mysql.data.mysqlclient.mysqlcommand("select nama_huruf,pixel_putih,pixel_hitam,jumlah_pixel,biner_karakter, citra_karakter karakter_plat pixel_putih='" & textbox1.text & "' or pixel_putih<='" & reng_atas & "' , pixel_putih>='" & reng_bawah & "'", conn)         rd = cmd.executereader()         rd.read()          if rd.hasrows              label1.text = rd.item(0)             textbox2.text = rd.item(1)             'dim foto byte() = rd.item(5)          end if

syntax above produces output -100 = n

i want -100 = a.

my answer based find nearest values of field specific field using query:

select * (     select         *,         row_number() on (order abs(@specificvalue - valuefield)) seq             atable) t     (seq <= 1); --if want have n nearest values change `1` `n`

using type of query (for example) give -99 instead of -102 @specificvalue = -100.

as alternative query (in mysql):

select * atable order     abs(-100 - pixel_putih) limit 1;

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