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group: Restaurant example
Pedidos = {
id_pedido:number, id_cliente:number, fecha:date, total:number
1 , 10 , 2020-09-26, 61000
2 , 9 , 2020-01-15, 61000
3 , 8 , 2020-02-15, 19000
4 , 7 , 2020-03-20, 15000
5 , 6 , 2020-01-15, 18000
6 , 5 , 2020-02-15, 6000
group: Trade database example
VENTAS = {
ID_VENTA:number, ID_FACTURA:number, ID_PRODUCTO:number, CANTIDAD:number
1 , 1 , 1 , 5
2 , 2 , 2 , 4
3 , 3 , 3 , 3
4 , 4 , 4 , 10
5 , 5 , 5 , 5
6 , 6 , 6 , 9