Lagged Data From a Custom Database

"GetData" is the main function that allows you to access custom databases data. It lets you retrieve an item value, from an intraday or historical database, that occurred within the current bar.

Let us say we have a custom database that contains fundamental data. One field in this database is called Revenues and it contains the dollar amount of revenues a company has made during a specific quarter. Revenues data is updated once a quarter, so your database will look like this:
01/04/2010 - 1271 (in millions of dollars)
01/01/2010 - 1265
01/10/2009 - 1259
01/07/2009 - 1262

When doing backtests or simply plotting a chart, the "GetData" indicator will return the most recent Revenues value given the bar's date.
So for a bar that occurred on 05/05/2010, the function will return "1271" and for a bar that occurred on 29/03/2010, "GetData" function will return "1265". It is very easy.

Now imagine you don't want to get the most recent value, but instead the previous one or the one before the previous one. This is the role of the current trading indicator. It allows you to get a lagged value from a custom database field.
The function name is "DbValr" and here is how to apply it given the previous Revenues fundamental item example:
DbValr("Fundamental", "Revenues", 0)
The above formula gets the revenues for the most recent quarter and it is exactly the same as the GetData formula

DbValr("Fundamental", "Revenues", 1)
This one gets the company's revenues amount for the previous quarter. On 05/05/2010, this trading indicator will return "1265".

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