Скачать или смотреть How to Effectively Group Data by Substrings in Pervasive SQL

Learn how to group data by substring criteria in Pervasive SQL to simplify your reporting needs.
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How to Effectively Group Data by Substrings in Pervasive SQL

If you're working with Pervasive SQL and grappling with how to group data by specific substring criteria, you're not alone! Many users find themselves needing to sort and organize their data in a specific way that standard queries may not accommodate. This guide addresses a common challenge related to grouping data based on substrings, using an example involving shelf locations and bin numbers.

The Problem: Grouping by Substrings

Let's set the stage with a practical example. Imagine you have a BIN field representing different parts stored on shelves. The shelf bins follow a pattern—such as GS7A01, GS7A02, etc.—where you'd like to group these entries by their shelf location and numbers.

Requirements

Group the bins by the shelf letter (the A in GS7A01) followed by the numerical suffix (the 01 in GS7A01).

You want to see all parts listed for each shelf before moving to the next shelf.

The Current Query Challenge

You may have tried running a query like this:

[[See Video to Reveal this Text or Code Snippet]]

While this query allows you to fetch data according to some criteria, it might not group the way you need. If you're encountering an error regarding grouping by the BIN column, it’s time to implement another approach.

The Solution: Simplifying the Query

Modifying the Order Clause

The key to achieving the desired output lies in the ORDER BY clause rather than using GROUP BY. To group the data correctly, you'll want to revise your ordering as follows:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Changes

RIGHT(): This function helps to extract the rightmost characters of the string (in this case, the last two characters of the BIN). This way, you can ensure that the items are sorted by their numerical suffix.

Pervasive SQL vs MySQL: If RIGHT() isn't available in Pervasive, you may need to use a similar function such as SUBSTRING() to achieve the same outcome, e.g., SUBSTRING(vim.BIN, LEN(vim.BIN)-1, 2).

Why You Don’t Need GROUP BY

In this context, using GROUP BY may not be necessary because your primary goal is to arrange and sort your data. By using proper ordering, you can present the information in the desired format without transforming your dataset into groups.

Conclusion

In summary, while it might not be immediately obvious how to group your report data in Pervasive SQL, the solution lies in effective ordering by the substring of your BIN field. By leveraging the RIGHT or SUBSTRING functions, you can achieve a structured result that meets your reporting needs.

If you consider this method and apply it wisely, you’ll find that configuring such queries becomes straightforward. And should complications persist, don't hesitate to consult your .Net ERP system documentation for bespoke solutions. Happy querying!