[请原谅格式错误 - 首先发布在这里，我努力做正确的事情]
从功能上讲，我只是想在“喜欢”项目的分组中找到价格最低的商品。例如 - 有大量的葡萄酒，但我需要找到价格最低的750毫升RED和WHITE;有大量的奶酪，但我需要找到价格最低的8盎司CHEDDAR以及FETA;等
我发现的所有解决方案都说我在代码中执行相同的操作。 我的“自我加入”一定有问题。选择查询本身在不到10秒的时间内运行，嵌套选择也是如此。但是，当我尝试加入它们时，我的查询会挂起并且永远不会完成。必须有一些方法才能成功加入。
我有数百万行数据。每行都是唯一的商品/商店组合。我的嵌套选择试图找到我们对非“名牌”品牌的最低价格;在'like'项目中找到最低价格，由列确定：store_name，category，subcategory，class，package_desc2，unit_name，chk（在我的查询中，“chk”由两个不同列的结果确定）。 / p>
这为我提供了上述列的所有组合的清晰列表，每个列的价格最低。我正在尝试加入非“名称”品牌商品，看看具有我们在嵌套选择中找到的低价格的确切商品。任何帮助表示赞赏！我已经好几天了，无法理解。
SQL在这里：
SELECT b.zone_name,
b.store_name,
b.family,
b.category,
b.subcategory,
b.class,
b.team,
b.subteam,
b.pos_dept,
b.brand_name,
b.item_description,
b.upc,
b.package_desc1 pkg,
b.package_desc2 sz,
b.unit_name,
CASE
WHEN b.good = 'good'
OR b.how_good = 1 THEN 'YES'
ELSE 'NO'
END AS chk,
b.eff_pricetype,
b.eff_price low_price,
b.cd dollar_sales,
b.cu unit_sales,
b.cgm margin_dollars,
b.cgm / Nullif(b.cd, 0) AS margin_pct,
b.deleted_item,
b.discontinue_item,
b.not_available,
b.remove_item,
b.recall_flag,
CASE
WHEN
SUM(
Isnull(b.deleted_item, 0) + Isnull(b.discontinue_item, 0) + Isnull(b.not_available, 0) + Isnull(b.remove_item, 0) + Isnull(b.recall_flag, 0)) = 0 THEN
'NO'
ELSE 'YES'
END AS istatus,
d.low
FROM mytable b
INNER JOIN(SELECT c.store_name,
c.category,
c.subcategory,
c.class,
c.package_desc2,
c.unit_name,
CASE
WHEN c.good = 'good'
OR c.how_good = 1 THEN 'YES'
ELSE 'NO'
END AS chk,
MIN(c.eff_price) low
FROM mytable c
WHERE store_name = 'some store'
AND brand_name NOT LIKE '%name%'
AND weeks = 'Last 12 weeks'
AND ( eff_pricetype = 'REG'
OR eff_pricetype = 'EDV'
OR eff_pricetype = 'GBC'
OR eff_pricetype = 'CMP'
OR eff_pricetype = 'LIN'
OR eff_pricetype = 'FRZ'
OR eff_pricetype = 'GBB'
OR eff_pricetype = 'EDLP'
OR eff_pricetype = 'GBN'
OR eff_pricetype = 'GBR'
OR eff_pricetype = 'MKT'
OR eff_pricetype = 'COMP'
OR eff_pricetype = 'R'
OR eff_pricetype = 'COM' )
AND ( family = 'carrots'
OR family = 'tomatoes'
OR family = 'Cheese'
OR family = 'Coffee'
OR family = 'peppers'
OR family = 'milk'
OR family = 'oil'
OR family = 'season'
OR family = 'Housewares'
OR family = 'paper'
OR family = 'Meat'
OR family = 'soup'
OR family = 'nuts'
OR family = 'pizza'
OR family = 'potatoes'
OR family = 'Seafood'
OR family = 'beer'
OR family = 'vitamins'
OR family = 'Tea'
OR family = 'Wine'
OR family = 'beans' )
GROUP BY c.store_name,
c.category,
c.subcategory,
c.class,
c.package_desc2,
c.unit_name,
c.good,
c.how_good
HAVING MIN(c.eff_price) > 0) AS d
ON b.store_name = d.store_name
AND b.category = d.category
AND b.subcategory = d.subcategory
AND b.class = d.class
AND b.package_desc2 = d.package_desc2
AND b.unit_name = d.unit_name
AND CASE
WHEN b.good = 'good'
OR b.how_good = 1 THEN 'YES'
ELSE 'NO'
END = d.chk
AND b.eff_price = d.low
WHERE store_name = 'some store'
AND brand_name NOT LIKE '%name%'
AND weeks = 'Last 12 weeks'
AND ( eff_pricetype = 'REG'
OR eff_pricetype = 'EDV'
OR eff_pricetype = 'GBC'
OR eff_pricetype = 'CMP'
OR eff_pricetype = 'LIN'
OR eff_pricetype = 'FRZ'
OR eff_pricetype = 'GBB'
OR eff_pricetype = 'EDLP'
OR eff_pricetype = 'GBN'
OR eff_pricetype = 'GBR'
OR eff_pricetype = 'MKT'
OR eff_pricetype = 'COMP'
OR eff_pricetype = 'R'
OR eff_pricetype = 'COM' )
AND ( family = 'carrots'
OR family = 'tomatoes'
OR family = 'Cheese'
OR family = 'Coffee'
OR family = 'peppers'
OR family = 'milk'
OR family = 'oil'
OR family = 'season'
OR family = 'Housewares'
OR family = 'paper'
OR family = 'Meat'
OR family = 'soup'
OR family = 'nuts'
OR family = 'pizza'
OR family = 'potatoes'
OR family = 'Seafood'
OR family = 'beer'
OR family = 'vitamins'
OR family = 'Tea'
OR family = 'Wine'
OR family = 'beans' )
GROUP BY b.zone_name,
b.store_name,
b.family,
b.category,
b.subcategory,
b.class,
b.team,
b.subteam,
b.pos_dept,
b.brand_name,
b.item_description,
b.upc,
b.package_desc1,
b.package_desc2,
b.unit_name,
d.org,
b.eff_pricetype,
b.eff_price,
b.cd,
b.cu,
b.cgm,
b.deleted_item,
b.discontinue_item,
b.not_available,
b.remove_item,
b.recall_flag,
d.low,
b.good,
b.how_good
答案 0 :(得分：1)
您可以通过更改族和pricetype子句来使用IN而不是OR来简化代码并可能提高性能。
例如：
AND eff_pricetype IN ('REG','EDV','GBC','CMP','LIN','FRZ',
'GBB','EDLP','GBN','GBR','MKT','COMP','R','COM')
AND family IN ('carrots','tomatoes','Cheese','Coffee', etc...
此外，如果您的子查询正如您所说的那样工作，则可以将它们放入两个不同的表变量中，然后将它们连接起来。