Difference between revisions of "TYPES"

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==COUNT() Returns the number or rows ==
==COUNT() Returns the number or rows ==
''' Returns the record count'''
  SELECT COUNT(*) FROM SALES
  SELECT COUNT(*) FROM SALES
''' Returns the record count'''
 
'''Count all orders not yet shipped'''
SELECT COUNT(*) "ORDERS NOT SHIPPED"
FROM orders
WHERE shipdate IS NULL;


==VARIANCE ==
==VARIANCE ==

Latest revision as of 21:12, 7 November 2017

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;


FIRST() Returns the first value of the group

LAST() Returns the last value of the group

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