TYPES

MIN()Returns the smallest Value

SELECT COUNT(*), SUM(TOTAL_AMOUNT), MIN(TOTAL_AMOUNT) from sales;

Returns the count in one column, the sum of the total_amount column and Min amount

MAX() Returns the largest Value

Ignores Null values

SELECT MAX(customer#)
FROM orders;

SUM() Returns the sum of values

Returns the count in one column and the sum of the total_amount column

SELECT COUNT(*), SUM(TOTAL_AMOUNT) from sales;

SELECT sum((paideach-cost)*quantity) "Total Profit"
FROM orderitems JOIN books USING (isbn)
WHERE order# = 1007

AVG() Returns the Average of Values

SELECT AVG(cost)
FROM books;

COUNT() Returns the number or rows

Returns the record count

SELECT COUNT(*) FROM SALES

Count all orders not yet shipped

SELECT COUNT(*) "ORDERS NOT SHIPPED"
FROM orders
WHERE shipdate IS NULL;

VARIANCE

Returns the variance - ignores NULL values

SELECT VARIANCE(retail)
FROM books;

LAST() Returns the last value of the group

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