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Stored Procedure vs Function in PL/SQL
In PL/SQL, stored procedures and functions are both named PL/SQL code blocks that perform a specific task. However, there are key differences between the two:
Stored Procedure:
- Can perform multiple operations and tasks.
- Can have input and output parameters.
- Cannot be used in SQL statements directly.
- Does not have a return statement.
- Is typically used for procedural tasks and data manipulation.
Function:
- Performs a single task and returns a value.
- Must have a return statement.
- Can be used in SQL statements directly.
- Can be part of an SQL query and return a value.
- Is typically used for calculations and data retrieval.
When to Choose:
The choice between a stored procedure and a function in a database application depends on the specific requirements of the task:
- Use a stored procedure when you need to perform multiple operations and tasks. For example, updating multiple tables, sending emails, and logging information.
- Use a function when you need to perform a calculation or data retrieval task that returns a value. For example, calculating a total, retrieving specific data based on input parameters.
Overall, understanding the differences between stored procedures and functions in PL/SQL is essential for designing efficient and effective database applications.
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