Скачать или смотреть Aggregation Functions in Oracle

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There are 5 types of Aggregation function.
1. COUNT: Which will count the number of records present in table.
SELECT COUNT(*) FROM emp;

2. MAX: Which will find the Maximum value from the specified column.
SELECT MAX(sal) FROM emp;

3. MIN: Which will find the Minimum value from the specified column.
SELECT MIN(sal) FROM emp;

4. AVG: Which will count the Average of values in specified column.
SELECT AVG(sal) FROM emp;

5. SUM: Which will SUM all the values specified column.
SELECT SUM(sal) FROM emp;

SELECT COUNT(*) COUNT, SUM(sal) SUM, MIN(sal) Minimum, MAX(sal) Maximum, AVG(sal) Average FROM emp;