我有两个复杂的查询,它们都是postgres中的子查询,其结果是:
q1_results = id , delta , metric_1
q2_results = id , delta , metric_2
我想结合查询的结果,因此外部查询可以访问:
results_a = id , delta , metric_1 , metric_2
results_b = id , delta , combined_metric
我无法弄清楚如何做到这一点。在线搜索会将我引导至UNION
,但这会将指标保留在同一列中。我需要让他们分开。
答案 0 :(得分:1)
您在问题和评论中提出的问题并不完全清楚,但听起来您可能正在寻找一系列合并语句的完整联接,例如:
-- create view at your option, e.g.:
-- create view combined_query as
select coalesce(a.id, b.id) as id,
coalesce(a.delta, b.delta) as delta,
a.metric1 as metric1,
b.metric2 as metric2,
coalesce(a.metric1,0) + coalesce(b.metric2,0) as combined
from (...) as results_a a
full join (...) as results_b b on a.id = b.id -- and a.delta = b.delta maybe?