The first is data flow. The second is procedure. The third is art.
Among them, data flow includes functions. Data flow can only be reflected in functions.
The data flow is quite troublesome and will be discussed later.
For example, the simplest way is to sell and buy products.
To realize this function.
Then you need a product basic table, product details table, store table, and backpack table. If the scalability is stronger, the corresponding double tables are indispensable.
The table issues are all simple. The key is what this item is used for. The source of such items, a lot of data, the direction of the items, and a lot of
data