How Can I Avoid Common SQL Anti-Patterns in Data Access?

Avoiding Inefficient SQL Practices

Relational database interactions frequently involve SQL anti-patterns that negatively impact data retrieval performance.

Separating Data Access from Presentation Logic

A frequent issue is embedding presentation logic directly into data access queries. This occurs when queries include formatting tailored to the user interface, such as concatenating fields, applying formatting, or implementing conditional logic within the SQL itself:

<code class="language-sql">SELECT
    FirstName || ' ' || LastName AS "Full Name",
    CASE UserRole
        WHEN 2 THEN 'Admin'
        WHEN 1 THEN 'Moderator'
        ELSE 'User'
    END AS "User's Role", ...
FROM Users</code>

This approach creates tightly coupled code, hindering reusability and maintainability. The data access layer should return raw data; formatting and conditional logic should be handled in the application layer, allowing for greater flexibility and adaptability to changing UI needs.

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