What are the potential pitfalls of using multiple tables for different types of data in a PHP application?

Using multiple tables for different types of data in a PHP application can lead to increased complexity in queries and potential performance issues when joining tables. To solve this, consider using a single table with a column to distinguish between different types of data, or using a relational database design that minimizes the need for complex joins. 

// Example of using a single table with a column to distinguish between different types of data
CREATE TABLE data (
    id INT PRIMARY KEY,
    type ENUM('type1', 'type2', 'type3'),
    data_value TEXT
);

// Query to retrieve data of type 'type1'
SELECT * FROM data WHERE type = 'type1';

Keywords

database design normalization foreign keys data redundancy SQL queries

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