http://www.stillsintransit.com/how-to-change-3/
How to calculate change over time in SQL?
I am completely new to SQL, so keep that in mind.
I have the daily prices of a stock in a column (and another column for dates), and want to generate another column that shows the daily percentage change of the prices [(today's price - yesterday's price)/yesterday's price ]. How do I do this?
you have to do a self join select statement
lets say you have the table
Stock
[
currentDate as Date
Price as double
]
to do your sql statement try out this
Select S1.currentDate as Today, (S1.Price – S2.Price) / S2.Price as Change
FROM
Stock as S1 INNER JOIN Stock as S2
ON S1.currentDate = (S2.currentDate+1)
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