屢次使用 left join 左鏈接 多個表

[b]1：product_version 2： p_category 3：p_category_product [/b] [quote] select [b]pc.[/b]name as "產品類別", [b]pv.[/b]product_id "產品ID", pv.version_id as "版本ID", pv.name as "產品名稱", pv.price as "原價", pv.curr

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