PL/SQL: Function vs Procedure - Understanding the Difference

PL/SQL is a procedural language used for developing applications in Oracle databases. One of the key components of PL/SQL is the ability to create and use functions and procedures. While both functions and procedures are used to perform specific tasks, there are some differences between the two.

├Źndice
  1. Functions
  2. Procedures
  3. Differences

Functions

A function is a PL/SQL block of code that performs a specific task and returns a value. Functions can be used in SQL statements and expressions to return a value. They can also be used in programming logic to perform calculations or other tasks.

Functions can have input parameters that are used to pass values to the function. These parameters are used within the function to perform calculations or other tasks. Functions can also have a return type, which defines the type of value that the function will return.

One important thing to note about functions is that they cannot perform any actions that modify the state of the database. They can only perform calculations or other tasks and return a value.

Procedures

A procedure is a PL/SQL block of code that performs a specific task. Unlike functions, procedures do not return a value. Instead, procedures are used to perform actions that modify the state of the database.

Procedures can have input and output parameters that are used to pass values to the procedure and return values from the procedure. These parameters are used within the procedure to perform actions that modify the state of the database.

Procedures are commonly used for tasks such as inserting, updating, or deleting data from the database. They can also be used to perform other tasks that require modifying the state of the database.

Differences

The main difference between functions and procedures is that functions return a value, while procedures do not. Functions can be used in SQL statements and expressions to return a value, while procedures are used to perform actions that modify the state of the database.

Another difference is that functions cannot perform actions that modify the state of the database, while procedures can. Functions can only perform calculations or other tasks and return a value, while procedures can be used to perform tasks that require modifying the state of the database.

In summary, functions and procedures are both important components of PL/SQL. While they are both used to perform specific tasks, there are some differences between the two. Functions return a value and cannot modify the state of the database, while procedures do not return a value and are used to perform tasks that require modifying the state of the database.

Keywords: PL/SQL, Function, Procedure, SQL statements, state of the database.
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