Скачать или смотреть How to Fix SQL Code to Display Case Level Suggested Fields Properly

Discover how to effectively update your SQL code in MS Access to display proper values for the `Case Level Suggested` field based on total calculations.
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This video is based on the question https://stackoverflow.com/q/62971535/ asked by the user 'Christopher' ( https://stackoverflow.com/u/13954419/ ) and on the answer https://stackoverflow.com/a/62972144/ provided by the user 'Applecore' ( https://stackoverflow.com/u/7944027/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing SQL Code for Case Level Suggestions in MS Access

Are you struggling to achieve accurate results in your SQL queries? Specifically, if you've tried to create a 'case level suggested' field that updates with letters A, B, C, or D based on total sum values but discovered that your code only returns "B" for totals over 3, you're not alone! Let's dive into the problem and fix the SQL code together for optimal results.

Understanding the Problem

When you run your SQL code, the expected output is a field that reflects suggestions (A, B, C, D) based on the sum of totals. However, you have encountered an issue where the logic of your IIf function restricts all results to "B" for numbers over 3. This happens due to the order in which the conditions are evaluated in your code.

Breakdown of the Original Code

Here’s the original SQL statement you are working with:

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

Key Areas of Concern:

Order of Evaluation: The IIf function evaluates each condition in sequence. Once a condition is satisfied, the rest are ignored. This is why if SumOfTotal is 4 or greater, it returns "B" and skips the others.

The Steps to Fix Your SQL Code

To achieve the desired result where the code accurately reflects A, B, C, or D based on the calculated sums, you need to reorder the checks.

1. Reorganize Conditions for Accuracy:

Modify your SQL so that it checks the higher thresholds first. Here’s the new suggested SQL code:

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

2. Explanation of Changes:

Now, the order of the checks is rewritten to evaluate high thresholds first:

A: For SumOfTotal values less than or equal to 3.

D: For values greater than or equal to 9.

C: For values greater than or equal to 6.

B: For values greater than or equal to 4.

Lastly, a fallback to "C" if no other condition is met.

3. Re-Test the Query:

After applying the changes, run your SQL query again to see if the new structure yields the appropriate results in the Case Level Suggested field.

Conclusion

With these revisions, your SQL query should now properly classify the sums into A, B, C, or D as intended. Remember, the key to the correct operation of your SQL code lies in the order of evaluation in nested functions like IIf.

If you have any further questions or need additional help, feel free to reach out. Happy querying!