varsql=@"select t1.*,t2.category_name,t2.sku_image,t2.sku_title_cn,t2.sku_title_en,(case when t3.available_days is null then t4.available_days else t3.available_days end) available_days ";
varsqlwhere=@" from dc_skuwarehouse_stock_sales t1
join dc_base_sku t2 on t1.bailun_sku = t2.bailun_sku ";
left join dc_base_sku t2 on t1.bailun_sku = t2.bailun_sku
left join dc_base_stock t3 on t1.bailun_sku=t3.bailun_sku and t1.warehouse_code=t3.warehouse_code
left join dc_semi_stock_sales_shipping t4 on t1.bailun_sku=t4.sku and t1.warehouse_code=t4.warehouse_id