This question is too general. One table (with many fields) will do, and so will multiple tables. The disadvantages of tables are many fields, slow processing speed, and many temporary tables must be used when programming. In short, it is complicated. The biggest advantage of multi-table is that the database processes data quickly and the programming is clear and clear. As for Lenovo, it depends on your needs. Generally, the same field (with * * *) in multiple tables is used for association, such as book number.