屢次使用left join 左鏈接的用法

  1:product_version 2: p_category 3:p_category_product 引用 select   pc.name as "產品類別",   pv.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_price "現價",
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