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DateDiff Previous Record By Richard Rost ![]() ![]() Calculate Date Differences Between Records in Access In this Microsoft Access tutorial, I will show you how to calculate the difference in dates between a record and the previous record. We'll start by using the easy method with the DMax function for quick calculations, though it may be slower for larger datasets. You'll learn how to create a query to determine the time difference between consecutive orders for a customer. We'll address common issues such as handling duplicate contact dates, setting up your query without errors, and why the DMax method is best suited for smaller datasets. Zoe from Springfield, Missouri (a Platinum Member) asks: How can I figure out the time between two consecutive orders for a customer in Microsoft Access? I've got this list of orders and dates but I'm not sure how to calculate the days between them like I do in Excel. For instance, if the first order was on March 1st and the next one was on March 3rd, I'd want it to show there's a 2 day difference. I'm also curious about what happens if two orders are on the same date. Any ideas on how to get started with this in Access? MembersIn the extended cut, we will learn how to calculate the date differences using two subqueries instead of the DMax method. I will show you how to select the previous contact date using subqueries for a more efficient calculation, which is especially useful for large datasets. Additionally, we will address the issue of handling records with identical dates by ensuring the date difference shows zero without including the current record itself. This approach involves writing a more complex query that accurately handles duplicate contact dates and performs the calculations efficiently. Silver Members and up get access to view Extended Cut videos, when available. Gold Members can download the files from class plus get access to the Code Vault. If you're not a member, Join Today! PrerequisitesLinksRecommended Courses
KeywordsTechHelp Access, date differences, consecutive records, DMax function, time between orders, calculated fields, Nz function, CDate function, subquery usage, ContactDate, PreviousContactDate, domain aggregate functions, subquery optimization, identical date issues, expert-level Access tips
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Keywords: TechHelp Access, date differences, consecutive records, DMax function, time between orders, calculated fields, Nz function, CDate function, subquery usage, ContactDate, PreviousContactDate, domain aggregate functions, subquery optimization, identical date PermaLink DateDiff Previous Record in Microsoft Access |