What are the two types of procedures in PL / SQL?

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What are the two types of procedures in PL / SQL?

PL/SQL – Procedures. PL/SQL provides two kinds of subprograms − Functions − These subprograms return a single value; mainly used to compute and return a value. Procedures − These subprograms do not return a value directly; mainly used to perform an action. This chapter is going to cover important aspects of a PL/SQL procedure.

How are procedures invoked in PL / SQL subprograms?

PL/SQL – Procedures. In this chapter, we will discuss Procedures in PL/SQL. A subprogram is a program unit/module that performs a particular task. These subprograms are combined to form larger programs. This is basically called the ‘Modular design’. A subprogram can be invoked by another subprogram or program which is called the calling program.

How are subprograms created and deleted in SQL?

At the schema level, subprogram is a standalone subprogram. It is created with the CREATE PROCEDURE or the CREATE FUNCTION statement. It is stored in the database and can be deleted with the DROP PROCEDURE or DROP FUNCTION statement.

Is the declarative part of a PL / SQL block optional?

Like anonymous PL/SQL blocks, the named blocks will also have the following three parts − It is an optional part. However, the declarative part for a subprogram does not start with the DECLARE keyword. It contains declarations of types, cursors, constants, variables, exceptions, and nested subprograms.

Is there way to create physical OS directory in PL / SQL?

PL/SQL itself does not have the means to create the physical OS directory. PL/SQL Tips provides a good example of how to create a C external procedure that executes shell commands.

How is a procedure created in PL / SQL?

Technically speaking, a PL/SQL procedure is a named block stored as a schema object in the Oracle Database. The following illustrates the basic syntax of creating a procedure in PL/SQL:

How to create a directory in SQL Server?

CREATE DIRECTORY. Use the CREATE DIRECTORY statement to create a directory object. A directory object specifies an alias for a directory on the server file system where external binary file LOBs ( BFILE s) and external table data are located. You can use directory names when referring to BFILE s in your PL/SQL code and OCI calls,…

How to create a directory object in Oracle?

Use the CREATE DIRECTORY statement to create a directory object. A directory object specifies an alias for a directory on the server file system where external binary file LOBs (BFILE s) and external table data are located.