1 / 2

To Find the Balance at a Point-in-time SQL

To Find the Balance at a Point-in-time SQL. Account fact. Date. Account. dateKey (FK) branchKey (FK) productKey (FK) accountKey(FK) accountStatusKey (FK) householdKey (FK) balance …. dateKey(PK) fullDate …. accountKey(PK) accountNum ….

ninon
Download Presentation

To Find the Balance at a Point-in-time SQL

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. To Find the Balance at a Point-in-time SQL Account fact Date Account dateKey (FK) branchKey (FK) productKey (FK) accountKey(FK) accountStatusKey (FK) householdKey (FK) balance … dateKey(PK) fullDate … accountKey(PK) accountNum … To find the balance as of a certain date requires finding the last transaction prior to the date The following assumes the date surrogate keys are “increasing” as the date “increases”

  2. To Find the Balance at a Point-in-time SQL Account fact Date Account dateKey (FK) branchKey (FK) productKey (FK) accountKey(FK) accountStatusKey (FK) householdKey (FK) balance … dateKey(PK) fullDate … accountKey(PK) accountNum … SELECT accountNum, balance FROM fact f, account a WHERE f.accountKey = a.accountKey AND f.dateKey = (select max(g.dateKey) FROM fact g WHERE g.accountKey = f.accountKey AND g.dateKey IN (SELECT d.dateKey FROM date d WHERE d.fullDate <= 'January 5, 2002') )

More Related