如何在presto SQL中按月分组

Question

我正在尝试在 Presto SQL 中按月分组。 我试过这个：

select
    date_trunc('month', CAST(date AS date)) date_month,
    sum(gross_revenue,0) AS 'monthly_net_revenue'
    from gross_revenue_calculator
    group by date_trunc('month', date)

这给了我以下错误： Malformed query: line 61:27: mismatched input ''monthly_net_revenue''. Expecting: <identifier> Malformed query: line 61:27: mismatched input ''monthly_net_revenue''. Expecting: <identifier>

预期输出：

October:  $102.12
November: $90.12

Answer 1

您不应该使用单引号作为列名，无论是没有引号还是双引号，您也可以像在WITH子句中一样按GROUP BY的索引引用列：

select
    date_trunc('month', CAST(date AS date)) date_month,
    sum(gross_revenue,0) AS monthly_net_revenue
from gross_revenue_calculator
group by 1