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This question is very confusing. What does MySQL splitting mean? What effect do you want to achieve? Describe the specific logic you want to achieve. If you can’t describe it clearly, no one can help you

The where method passes the query conditions, field passes the field to be queried, order passes the sorting conditions, and limit passes the query record number interval. I suggest you check the official documentation of tp

Do you mean to use thinkphp to achieve horizontal splitting or vertical splitting of mysql?
If so, it has nothing to do with thinkphp.