Oracle - Wikitechy https://www.wikitechy.com/interview-questions/category/oracle/ Interview Questions Fri, 17 Sep 2021 10:21:46 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png Oracle - Wikitechy https://www.wikitechy.com/interview-questions/category/oracle/ 32 32 Difference between Procedure and Function ? https://www.wikitechy.com/interview-questions/oracle/difference-between-procedure-and-function/ https://www.wikitechy.com/interview-questions/oracle/difference-between-procedure-and-function/#respond Tue, 20 Jul 2021 09:28:09 +0000 https://www.wikitechy.com/interview-questions/?p=1135

Difference between Procedure and Function ?

Procedure

  • A procedure is a named PL/SQL block which performs one or more specific task.This is similar to a procedure in other programming languages.
  • A procedure has a header and a body.
  • The header consists of the name of the procedure and the parameters or variables passed to the procedure.
  • The body consists declaration section, execution section and exception section similar to a general PL/SQL Block. A procedure is similar to an anonymous PL/SQL Block but it is named for repeated usage.

We can pass parameters to procedures in three ways

Parameters Description
IN type These types of parameters are used to send values to stored procedures
OUT type These types of parameters are used to get values from stored procedures. This is similar to a return type in functions.
IN OUT type These types of parameters are used to send values and get values from stored procedures.

Syntax

CREATE [OR REPLACE] PROCEDURE procedure_name (<Argument> {IN, OUT, IN OUT}    <Datatype>,…)  
IS 
  Declaration section<variable, constant> ; 
BEGIN 
  Execution section 
EXCEPTION 
  Exception section  
END

Functions

  • A function is a named PL/SQL Block which is similar to a procedure.
  • 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.

Syntax

CREATE [OR REPLACE] FUNCTION function_name [parameters]  
 RETURN return_datatype;  {IS, AS} 
 Declaration_section <variable,constant> ;
 BEGIN   
    Execution_section 
    Return return_variable;   
 EXCEPTION 
   exception section   
    Return return_variable;  
 END;

Procedure vs function

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.
It is not mandatory to return the value. It is mandatory to return the value.
RETURN will simply exit the control from subprogram. RETURN will exit the control from subprogram and also returns the value.
Return datatype will not be specified at the time of creation. Return datatype is mandatory at the time of creation.
]]> https://www.wikitechy.com/interview-questions/oracle/difference-between-procedure-and-function/feed/ 0 What is the maximum size of a row in oracle 9i ? https://www.wikitechy.com/interview-questions/oracle/what-is-the-maximum-size-of-a-row-in-oracle-9i/ https://www.wikitechy.com/interview-questions/oracle/what-is-the-maximum-size-of-a-row-in-oracle-9i/#respond Tue, 20 Jul 2021 09:27:14 +0000 https://www.wikitechy.com/interview-questions/?p=1134

What is the maximum size of a row in oracle 9i ?

  • The oracle is Unlimited of size.There is no limitations for row size in oracle 9i.
]]> https://www.wikitechy.com/interview-questions/oracle/what-is-the-maximum-size-of-a-row-in-oracle-9i/feed/ 0 If I want to develop an oracle applications report using report builder 6i and if I have two user parameters. How to provide list of values to parameters, which should show me at the time of submitting concurrent program ? https://www.wikitechy.com/interview-questions/oracle/if-i-want-to-develop-an-oracle-applications-report-using-report-builder-6i-and-if-i-have-two-user-parameters-how-to-provide-list-of-values-to-parameters-which-should-show-me-at-the-time-of-submittin/ https://www.wikitechy.com/interview-questions/oracle/if-i-want-to-develop-an-oracle-applications-report-using-report-builder-6i-and-if-i-have-two-user-parameters-how-to-provide-list-of-values-to-parameters-which-should-show-me-at-the-time-of-submittin/#respond Tue, 20 Jul 2021 09:23:45 +0000 https://www.wikitechy.com/interview-questions/?p=1133
  • Create two new value sets for the parameters that are to be used.
  • Query the concurrent program definition.
  • Go into Parameters window.
  • Attach the value set to each of the parameters that are being used.

Concurrent Programe

  • The concurrent programe is nothing but instances of execution file along with parameter and incompatible programs.
  • We can register 11 types of executable as Concurrent Programe.

Advantages

  • We can execute multi language programs as Concurrent Programe.
  • When we run Concurrent Programe we can utilize 100% local machine hardware capacity.
  • We can change the Concurrent Programe output based on employee profile.
  • We can submit only Request.
  • We can schedule the Concurrent Programe as per client requirement.
]]> https://www.wikitechy.com/interview-questions/oracle/if-i-want-to-develop-an-oracle-applications-report-using-report-builder-6i-and-if-i-have-two-user-parameters-how-to-provide-list-of-values-to-parameters-which-should-show-me-at-the-time-of-submittin/feed/ 0 What is the Difference between a Join and Subquery ? https://www.wikitechy.com/interview-questions/oracle/what-is-the-difference-between-a-join-and-subquery/ https://www.wikitechy.com/interview-questions/oracle/what-is-the-difference-between-a-join-and-subquery/#respond Tue, 20 Jul 2021 09:17:30 +0000 https://www.wikitechy.com/interview-questions/?p=1132

Join

  • Joins are SELECT commands that retrieve data from two or more tables.
  • The WHERE clause usually gives the join conditions that determine how data is selected from each table in the join to fill in the specified columns in the select list.
  • Joins are used to return rows.
  • Join is an integral part of the select statement.

Subquery

  • Subquery is a SELECT statement within another SQL Statement.
  • Subqueries structure a complex query into isolated parts.
  • Subqueries allow you to use the results of another query in the outer query.
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