我有一张table叫 product_pricing .
在这里，我可以为每个id添加多个价格 product_pricing . timestamp_valid …这是我用来提前安排价格变动的。
SELECT
`products`.`wo_id`,
`products`.`fty_id`,
`products`.`price` AS price1,
`product_attributes`.`fty_id`,
`product_attributes`.`cat_id`,
`product_attributes`.`design_id`,
`product_attributes`.`season_id`,
`products_u_ids`.`u_id`,
`products_u_ids`.`link_id`,
`product_designs`.`design_id`,
`product_designs`.`brand_id`,
COALESCE(`product_pricing`.`u_id`, NULL) AS price2_u_id,
COALESCE(`product_pricing`.`currency`, NULL) AS price2_currency,
COALESCE(`product_pricing`.`price`, NULL) AS price2,
COALESCE(`product_pricing`.`formula_id`, NULL) price2_formula_id,
COALESCE(`product_pricing`.`vat_calculated`) AS price2_vat_calculated,
COALESCE(`product_pricing`.`vat_id`, NULL) AS price2_vat_id,
COALESCE(`product_pricing`.`timestamp_valid`, NULL) price2_timestamp_valid,
COALESCE(`product_price_formulas`.`formula_id`, NULL) AS price2_formula_id,
COALESCE(`product_price_formulas`.`formula`, NULL) AS price2_formula,
COALESCE(`global_vat_tariffs`.`vat_id`, NULL) AS price2_vat_id,
COALESCE(`global_vat_tariffs`.`percentage`, NULL) AS price2_vat_tariff
FROM `products`
LEFT JOIN `product_attributes`
ON `products`.`fty_id` = `product_attributes`.`fty_id`
LEFT JOIN `products_u_ids`
ON `product_attributes`.`fty_id` = `products_u_ids`.`link_id`
LEFT JOIN `product_designs`
ON `product_attributes`.`design_id` = `product_designs`.`design_id`
LEFT JOIN `product_pricing`
ON `products_u_ids`.`u_id` = `product_pricing`.`u_id`
LEFT JOIN `product_price_formulas`
ON `product_pricing`.`formula_id` = `product_price_formulas`.`formula_id`
LEFT JOIN `global_vat_tariffs`
ON `product_pricing`.`vat_id` = `global_vat_tariffs`.`vat_id`
LEFT OUTER JOIN (
SELECT `product_pricing`.`u_id`, MAX(`timestamp_valid`) AS MaxDate
FROM `product_pricing`
WHERE `product_pricing`.`timestamp_valid` <= UTC_TIMESTAMP
GROUP BY `product_pricing`.`u_id`
) AS temp ON temp.u_id = `product_pricing`.`u_id` AND temp.MaxDate = `product_pricing`.`timestamp_valid`
WHERE `products`.`wo_id` IN ('028284', '018305', '031536')上面的sql返回给定id的所有行，而不是仅仅返回 product_pricing . timestamp_valid``<= UTC_TIMESTAMP() .
车里有个问题 LEFT OUTER JOIN .
这个sql所做的另一件事是，当没有为 price2 ，它不应该破坏脚本，只需为 price2 . 我是通过使用 COALESCE .
这就是我得到的：
这是我应该得到的：
假设查询日期为2018-5-7。
有什么办法解决这个问题吗 LEFT OUTER JOIN ?
1条答案
按热度按时间pbossiut1#
你用的是
LEFT JOIN对包含您提到的时间戳筛选器的子查询执行的操作。左联接保留与其on条件不匹配的行。你可以试试普通的INNER加入子查询；内部联接不保留与on条件匹配的行。