Order by bisa diartikan Diurutkan Berdasarkan Data yang kita punya.
Syntax SQL
SELECT [Nama Kolom]
FROM [Nama Tabel]
WHERE [Kondisi]
ORDER BY [Nama Kolom] [ASC | DESC]
Contoh-nya
SELECT *
FROM pembelian
ORDER BY id ASC
// atau
SELECT *
FROM `pembelian`
WHERE barang = "sepatu"
ORDER BY id DESC