In data management and analysis, forms are the basic storage unit, and how to manage these forms efficiently is the key to achieving high-quality data analysis. In the previous article we discussed the different data types in MySQL and how to create forms.
This article will delve into the advanced settings of MySQL forms, including setting constraints, auto-increment fields, and other options.
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Set constraints
Constraints are used to limit the type, range, or relationship of data in a table to data in other tables. They are an important guarantee of database integrity.
A primary key is a field or combination of fields used to uniquely identify each row of data in a table. For example, in the game data of "Three Kingdoms", each general has a unique ID, and this ID can be used as the primary key.
CREATE TABLE san_wujiang ( .....