我有一张叫product_pricing
的桌子。
在这里,我可以为每个ID添加多个价格。区别它们的是product_pricing
。timestamp_valid
...it是我用来提前安排价格变化的工具。
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,而不只是返回product_pricing
.
LEFT OUTER JOIN
中出现问题。
这个SQL做的另一件事是,当没有为price2
设置任何东西时,它不应该破坏脚本,而只是为price2
返回NULL。我正在使用COALESCE
来解决这个问题。
这就是我得到的:
这就是我应该得到的:
假设查询日期为2018-5-7。
有什么想法可以用LEFT OUTER JOIN
解决这个问题吗?
发布于 2018-07-07 05:28:19
您正在对包含您提到的时间戳过滤器的子查询使用LEFT JOIN
操作。左连接保留与其ON条件不匹配的行。您可以在该子查询上尝试一个普通的INNER
连接;内部连接不会保留与on条件匹配的行。
https://stackoverflow.com/questions/51217335
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