Hola quisiera me pudieran ayudar a resolver mi duda
1.Campos date
           <FONT size=5 color="#000000">Fecha inicio</FONT>
            <input type="date" id="date_inicio" name="date_inicio">
            <FONT size=5 color="#000000">Fecha fin</FONT>
            <input type="date" id="date_fin" name="date_fin">2.consulta a la base de datos
                                       $sql= "SELECT DISTINCT
                                        u.id as id_sales,
                                        u.date as date, 
                                        u.biller_id as biller_id,
                                        c.id as id_company,
                                        c.company as company,
                                        e.cost as cost, 
                                        e.id as id_product, 
                                        e.name as name, 
                                        e.price as price ,
                                        e.category_id as category_id,
                                        s.id as id_item,
                                        s.sale_id as sale_id,
                                        s.product_id as product_id,
                                        a.id as id_category
                                        FROM  
                                        sma_sales as u,
                                        sma_companies as c,
                                        sma_products as e,
                                        sma_sale_items as s,
                                        sma_categories as a 
                                        WHERE c.id = u.biller_id 
                                        AND u.id = s.sale_id
                                        AND s.product_id = e.id
                                        AND c.id=14
                                        AND u.date = $date_inicio
                                        GROUP BY s.id
                                        ORDER BY u.biller_id, e.cost, e.name ";Dependiendo los datos que ingrese en date_inicio y date_fin tengo que realizar la consulta de mi base de datos ¿como puedo hacer eso?
De ante mano muchas gracias



