Finding the Correct Row Based on Effective Date

Finding the Correct Row Based on Effective Date

I have a table with three columns: the firstcontains the name of the currency, thesecond contains the currency rate and the third contains the actual date when thecurrency rate changed. They are in no particularorder, neither by currency, rate or date.My question is: how can I select a specific date and return the currency rate in effect for that date?

For example, the data might look like this:

    DEM   5.76   01/19/96    DKK   1.32   01/04/96    DEM   5.92   02/09/96    BEF   0.33   04/04/96    DEM   5.88   01/04/96    …   ….   ……..
How do I retrieve the actual currency rate forDeutche Mark, DEM, for January 20, 1996?(The answer should be 5.76.)

Try this:

    SELECT value FROM Currencies        WHERE currency=’DEM’ AND        chg_date IN             (SELECT MAX(chg_date) FROM Currencies                WHERE chg_date <='01/20/96'); 

Share the Post:
data observability

Data Observability Explained

Data is the lifeblood of any successful business, as it is the driving force behind critical decision-making, insight generation, and strategic development. However, due to its intricate nature, ensuring the

Heading photo, Metadata.

What is Metadata?

What is metadata? Well, It’s an odd concept to wrap your head around. Metadata is essentially the secondary layer of data that tracks details about the “regular” data. The regular

XDR solutions

The Benefits of Using XDR Solutions

Cybercriminals constantly adapt their strategies, developing newer, more powerful, and intelligent ways to attack your network. Since security professionals must innovate as well, more conventional endpoint detection solutions have evolved