我有一个中等复杂的查询要运行,为了这个问题,我在下面做了一些简化。我有 2 张桌子;
TABLE: plan_costs
id, plan_id, cost, special_cost + more columns....
1 1 23.00 12.00
2 1 25.00 15.00
3 2 5.00 2.00
4 2 45.00 28.00
5 3 35.00 30.00
6 3 65.00 60.00
TABLE: plan_details
plan_id, group_id, + more columns....
1 1
2 1
3 2
我需要的是最便宜的计划列表,介于 2 个值之间(在本例中为 5 和 30),但每组只有一个计划。当我运行下面的计划时,我每组得到一个计划,但它并不总是最便宜的。注意:有一个 case 条件,如果它不为 0,则优先使用 special_cost 而不是 cost。有什么想法吗?
SELECT p1.id,
p2.plan_id,
p1.cost,
p1.special_cost CASE
WHEN p1.special_cost = 0 THEN MIN(p1.cost)
ELSE MIN(p1.special_cost)
END AS cost_order,
FROM plan_costs AS p1
LEFT JOIN plan_details AS p2 ON (p2.plan_id = p1.plan_id)
WHERE CASE
WHEN p1.special_cost = 0 THEN p1.cost >= 5
ELSE p1.special_cost >= 5
END
AND CASE
WHEN p1.special_cost = 0 THEN p1.cost <= 30
ELSE p1.special_cost <= 30
END
GROUP BY p2.group_id
ORDER BY CASE
WHEN p1.special_cost = 0 THEN p1.cost
ELSE p1.special_cost
END ASC
编辑:添加了我需要的最终结果
要求的结果:
id, plan_id, cost, special_cost
1 1 23.00 12.00
5 3 35.00 30.00