“A procedures or function is a group or set of SQL and PL/SQL statements that perform a specific task.” A function and procedure is a named PL/SQL Block which is similar . The major difference between a procedure and a function is, a function must always return a value, but a procedure may or may not return a value.
What is a procedure in PL SQL?
A procedure is a group of PL/SQL statements that you can call by name. A call specification (sometimes called call spec) declares a Java method or a third-generation language (3GL) routine so that it can be called from SQL and PL/SQL. The call spec tells Oracle Database which Java method to invoke when a call is made.
What is difference between procedure and function in PL SQL?
Procedure Vs. Function: Key Differences
| Procedure | Function |
|---|---|
| Used mainly to a execute certain process | Used mainly to perform some calculation |
| Cannot call in SELECT statement | A Function that contains no DML statements can be called in SELECT statement |
| Use OUT parameter to return the value | Use RETURN to return the value |
What is procedure and function in Oracle?
A procedure is a subprogram that performs a specific action. You specify the name of the procedure, its parameters, its local variables, and the BEGIN-END block that contains its code and handles any exceptions. A function is a subprogram that computes and returns a value.
What do you mean by a function and a procedure?
A procedure performs a task, whereas a function produces information. Functions differ from procedures in that functions return values, unlike procedures which do not. However, parameters can be passed to both procedures and functions. In a program for drawing shapes, the program could ask the user what shape to draw.
Why do we use procedures in PL SQL?
Stored procedures define an independent procedural workflow where you can perform a series of DML and/or other operations. … Stored procedures do not have to return a value. Hence, they cannot be called from inside an SQL statement. Stored procedures must be executed from a PL/SQL block- named or anonymous.
How do I create a trigger in PL SQL?
Syntax for creating trigger:
- CREATE [OR REPLACE ] TRIGGER trigger_name.
- {BEFORE | AFTER | INSTEAD OF }
- {INSERT [OR] | UPDATE [OR] | DELETE}
- [OF col_name]
- ON table_name.
- [REFERENCING OLD AS o NEW AS n]
- [FOR EACH ROW]
- WHEN (condition)
What is the main difference a function and a procedure?
Function is used to calculate something from a given input. Hence it got its name from Mathematics. While procedure is the set of commands, which are executed in a order. 3.
What is trigger in PL SQL with examples?
Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, written to be executed in response to any of the following events − A database manipulation (DML) statement (DELETE, INSERT, or UPDATE) A database definition (DDL) statement (CREATE, ALTER, or DROP).
What is difference function and stored procedure?
What are the differences between Stored procedures and functions?
| Functions | Procedures |
|---|---|
| A function does not allow output parameters | A procedure allows both input and output parameters. |
| You cannot manage transactions inside a function. | You can manage transactions inside a procedure. |
What is difference between function and procedure in Oracle?
The difference is- A function must return a value (of any type) by default definition of it, whereas in case of a procedure you need to use parameters like OUT or IN OUT parameters to get the results. You can use a function in a normal SQL where as you cannot use a procedure in SQL statements.
What are the advantages of procedure & function?
The advantages of using procedures and functions are:
- Reducing duplication of code.
- Decomposing complex problems into simpler pieces.
- Improving clarity of the code.
- Reuse of code.
- Information hiding.
What is difference between procedure and package in Oracle?
Stored Program Units (Procedures, Functions, and Packages) A stored procedure, function, or package is a PL/SQL program unit that: Has a name. … The only difference between procedures and functions is that functions always return a single value to the caller, while procedures do not return a value to the caller.