屡次使用left join 左链接的用法

  1:product_version 2: p_category 3:p_category_product 引用 select   pc.name as "产品类别",   pv.product_id "产品ID",   pv.version_id as "版本ID",   pv.name as "产品名称",   pv.price as "原价",   pv.curr_price "现价",
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