mysql - Using cases to determine which table should join -


i have 4 tables products, product_histories, vendor_invoices , invoices

this query have developed

select p.product_id, product_name, vendor_name products p inner join product_histories ph on p.product_id = ph.product_id case     when ph.history_type = "p"         left join vendor_invoices vi on link_id = vi.vi_id      when ph.history_type = "s"         left join invoices on i.invoice_id = link_id end order ph_id asc

what want if ph.history_type p should join vendor_invoices , if s should join invoices. says there syntax error. can me out it? or show better way achieve problem.


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