Example:
SELECT
(SELECT SUM(...) FROM ...) as turnover,
(SELECT SUM(...) FROM ...) as cost,
turnover - cost as profit
当然这是无效的（至少在 Postgres 中），但是如何在查询中实现相同的效果而不需要重写子查询两次？
Like so:
SELECT
turnover,
cost,
turnover - cost as profit
from (
(SELECT SUM(...) FROM ...) as turnover,
(SELECT SUM(...) FROM ...) as cost
) as partial_sums
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