Question

我希望能够在条件语句中包含二进制变量：

select sum(t.hours), count(tk.id) from time t
inner join tickets tk on tk.id = t.ticket_id
where tk.active = :active_type
and t.billable = :billable;

:active类型可以是'R'或'P'
:billable可以是True或False

我为每个排列写了四遍，但这确实很丑。 Postgres是否允许某些东西使其更优雅？

Answer 1

您可以使用GROUP BY在单个查询中获得结果：

SELECT active, billable, SUM(t.hours), COUNT(tk.id)
FROM time t
INNER JOIN tickets tk ON tk.id = t.ticket_id
WHERE tk.active IN ('P', 'R')
GROUP BY active, billable
ORDER BY active, billable;

如果tickets.active只能是'R'或'P'，则可以跳过WHERE子句。

Postgres条件下的变量

1 个答案: