What are prepared statements in SQL and why are they important?
- Statements with code comments.
- Queries with placeholders.
- Statements with aggregate functions.
- Dynamic SQL queries.
Prepared statements in SQL are queries with placeholders for input data, rather than hardcoding values directly into the query string. They are important for several reasons: 1. Security: They prevent SQL injection attacks by separating user input from the SQL code. 2. Performance: The database can optimize and cache the execution plan, resulting in faster query execution. 3. Reusability: Prepared statements can be reused with different parameter values, reducing query compilation overhead. 4. Maintainability: Code is cleaner and less error-prone as it separates SQL logic from data.
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