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/*
===============================================================================
Repository : 08-Oracle-SQL
Folder : Source-Code/16-Multirow-Functions
File Name : 01-Multirow-Functions.sql
Topic : Multirow Functions (Aggregate Functions)
Description : Practical examples demonstrating Oracle SQL Aggregate
Functions including COUNT(), MIN(), MAX(), SUM(),
and AVG().
Author : Shaik Mahaboob Basha
License : MIT License
===============================================================================
*/
-- =============================================================================
-- NOTE
-- =============================================================================
-- This script assumes the EMP table already exists.
--
-- Execute the database setup script before running these examples.
-- =============================================================================
-- =============================================================================
-- SECTION 1 : COUNT()
-- =============================================================================
PROMPT
PROMPT ============================================================
PROMPT COUNT() - Count All Employee Records
PROMPT ============================================================
SELECT COUNT(*)
FROM EMP;
PROMPT
PROMPT ============================================================
PROMPT COUNT() - Count Distinct Salaries
PROMPT ============================================================
SELECT COUNT(DISTINCT SALARY)
FROM EMP;
-- =============================================================================
-- SECTION 2 : MIN()
-- =============================================================================
PROMPT
PROMPT ============================================================
PROMPT MIN() - Minimum Employee Salary
PROMPT ============================================================
SELECT MIN(SALARY)
FROM EMP;
PROMPT
PROMPT ============================================================
PROMPT MIN() - Minimum Distinct Salary
PROMPT ============================================================
SELECT MIN(DISTINCT SALARY)
FROM EMP;
PROMPT
PROMPT ============================================================
PROMPT MIN() - Oldest Hire Date
PROMPT ============================================================
SELECT MIN(HIRE_DATE)
FROM EMP;
-- =============================================================================
-- SECTION 3 : MAX()
-- =============================================================================
PROMPT
PROMPT ============================================================
PROMPT MAX() - Maximum Employee Salary
PROMPT ============================================================
SELECT MAX(SALARY)
FROM EMP;
PROMPT
PROMPT ============================================================
PROMPT MAX() - Maximum Distinct Salary
PROMPT ============================================================
SELECT MAX(DISTINCT SALARY)
FROM EMP;
PROMPT
PROMPT ============================================================
PROMPT MAX() - Latest Hire Date
PROMPT ============================================================
SELECT MAX(HIRE_DATE)
FROM EMP;
-- =============================================================================
-- SECTION 4 : SUM()
-- =============================================================================
PROMPT
PROMPT ============================================================
PROMPT SUM() - Total Employee Salary
PROMPT ============================================================
SELECT SUM(SALARY)
FROM EMP;
PROMPT
PROMPT ============================================================
PROMPT SUM() - Total Distinct Salaries
PROMPT ============================================================
SELECT SUM(DISTINCT SALARY)
FROM EMP;
-- =============================================================================
-- SECTION 5 : AVG()
-- =============================================================================
PROMPT
PROMPT ============================================================
PROMPT AVG() - Average Employee Salary
PROMPT ============================================================
SELECT AVG(SALARY)
FROM EMP;
PROMPT
PROMPT ============================================================
PROMPT AVG() - Average Distinct Salary
PROMPT ============================================================
SELECT AVG(DISTINCT SALARY)
FROM EMP;
PROMPT
PROMPT ============================================================
PROMPT MIN() - Hire Date of Oldest Employee
PROMPT ============================================================
SELECT MIN(HIRE_DATE)
FROM EMP;
-- =============================================================================
-- End of Script
-- =============================================================================