Why do we always prefer using parameters in SQL statements?

There are several reasons why it is preferred to use parameters in SQL statements:

1. Security: Using parameters in SQL statements helps prevent SQL injection attacks. When you use parameters, the values are treated as data, not as part of the SQL code, so an attacker cannot modify the SQL code itself.
2. Performance: When you use parameters in SQL statements, the database can cache the execution plan for the statement, which can lead to better performance when executing the same statement multiple times with different values.
3. Reusability: When you use parameters in SQL statements, you can reuse the same statement multiple times with different values, reducing the amount of code you need to write and maintain.
4. Readability: Using parameters in SQL statements can make the code easier to read and understand, especially when the same value is used in multiple places in the same statement.

Overall, using parameters in SQL statements is a best practice that can improve the security, performance, reusability, and readability of your code.