The basic principles of database design are: 1. Store data with the same theme in a data table; 2. Try to eliminate redundancy and improve the speed of accessing the database; 3. In a relational database, each data The relationship between tables can only be one-to-one and one-to-many.
Basic principles of database design:
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( 1) Store data with the same topic in a data table, "one table for one use";
(2) Try to eliminate redundancy and improve the speed of accessing the database;
( 3) It is generally required that the database design reaches the third paradigm, many-to-many, which eliminates data redundancy, modification exceptions, insertion exceptions, and deletion exceptions to the greatest extent, and basically meets the requirements of relational standardization;
(4) Relational database , the relationship between each data table can only be one-to-one and one-to-many. Many-to-many relationships must be converted into one-to-many relationships for processing;
(5) When designing the data table structure, the dynamic adaptability of the table structure should be considered.
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