字段总数不能超过一个值

Question

我如何告诉oracle apex一个字段（个人）的总和不能超过5（5是该字段的总数）。因此，举例来说，某人最多可能需要花费5个私人日，但除了必须休假外，不能超过该天

Answer 1

Here's one option:

• create a function (which accepts person's ID) and returns total number of personal days (that would be a simple SELECT statement with a SUM function) and - probably - a WHERE clause that restricts rows to ... what? The last year?
• on Apex page, create a validation for item you use to enter number of personal days; its type would be a PL/SQL Function which returns error text, and checks whether number of entered personal days + total number of personal days (so far) (returned by a function) exceeds 5 days. If so, display an error.