Let's take a look at this problem_PHP Tutorial

We want to build an information publishing function, but the information under each category is not unified. For example, they all have the same basic elements: title, release time, and text. In some categories, the information may have one to four fields, some may also require accompanying pictures, and some may require document content, etc. That is, everything from table structure to HTML form may be different. How to design it
One: Make only one table and take all possible fields into consideration
Two: Make a table that only contains basic fields, and use associations for other redundant fields
Three: Haven’t thought about it yet
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