上个月的最后一天 - BigQuery [英] The last day of the previous month - BigQuery

问题描述

我正在尝试选择时间戳字段 recdate 的日期值直到并包含该月最后一天完成的行.例如，由于这是 2016 年 7 月，我希望日期值不超过 31-06-2016 的所有行.这曾经在 T-SQL 中工作正常，我会使用以下内容并将其分配给 @today 并将其放在我的 WHERE 中:

DECLARE @today DATETIME SELECT @today = CONVERT(VARCHAR(25),DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,GETDATE())-0,0)));

我在 BigQuery 中遇到了困难，我无法让 DATEDIFF 或 GETDATE 工作，想知道是否有人对此有想法?

最好的祝福

戴夫

解决方案

2020 年 10 月更新(BigQuery 标准 SQL)

BigQuery 现在支持

我个人 - 我喜欢第一个选项，因为它最不冗长和直接！

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以下面为例(BigQuery Legacy SQL)

SELECT DATE(DATE_ADD(CURRENT_DATE() , -DAY(CURRENT_DATE()), DAY"))

顺便说一句，六月有 30 天 :o) - 除了 Priestley 的 "六月三十一日"

I'm trying to select rows where a timestamp field, recdate, has a date value up to and inclusive of the last completed day of the month. For example, as this is July 2016, I want all rows with date values up to and inclusive of 31-06-2016. This used to work fine in T-SQL, I'd use the following and assign it to @today and chuck that in my WHERE:

DECLARE @today DATETIME SELECT @today = CONVERT(VARCHAR(25),DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,GETDATE())-0,0)));

I'm struggling in BigQuery though, I can't get DATEDIFF or GETDATE to work, was wondering if anybody had thoughts on this?

best wishes

Dave

解决方案

October 2020 Update (BigQuery Standard SQL)

BigQuery now support LAST_DAY function as well as arithmetic operations + and '-' for dates

So, now you can use below options to get last day of previous month

#standardSQL
select 
  date_trunc(current_date(), month) - 1, 
  last_day(date_sub(current_date(), interval 1 month)),
  date_sub(last_day(current_date()), interval 1 month)

with output (having in mind it is October 14 today)

me personally - i love the first option as least verbose and straightforward!

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Use below as an example (BigQuery Legacy SQL)

SELECT DATE(DATE_ADD(CURRENT_DATE() , -DAY(CURRENT_DATE()), "DAY"))

BTW, there are 30 days in June :o) - with exception of Priestley's "The Thirty-First of June"

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