我正在寻找一个允许我解析 ISO8601 时间戳的通用函数。我知道 to_timestamp_tz
,但我找不到创建 format
参数的方法,该参数将解析 ISO-8601 日期时间的所有可能变体:
select '2012-01-01T12:00:00+00:00'::timestamp_tz; // this works
select '2012-01-01T12:00:00+0000'::timestamp_tz; //Timestamp '2012-01-01T12:00:00+0000' is not recognized, although is a valid iso8601 (no colon in the timezone)
select to_timestamp_tz('2012-01-01T12:00:00.123456+00:00', 'YYYY-MM-DDTHH24:MI:SS.FFTZH:TZM'); // works
select to_timestamp_tz('2012-01-01T12:00:00.123456+0000', 'YYYY-MM-DDTHH24:MI:SS.FFTZH:TZM'); // Can't parse '2012-01-01T12:00:00.123456+0000' as timestamp with format 'YYYY-MM-DDTHH24:MI:SS.FFTZH:TZM', again because of it has no colon in the timezone
select to_timestamp_tz('2012-01-01T12:00:00.123456+0000', 'YYYY-MM-DDTHH24:MI:SS.FFTZHTZM'); //works
select to_timestamp_tz('2012-01-01T12:00:00.123456+00:00', 'YYYY-MM-DDTHH24:MI:SS.FFTZHTZM'); //Can't parse '2012-01-01T12:00:00.123456+00:00' as timestamp with format 'YYYY-MM-DDTHH24:MI:SS.FFTZHTZM' , fails because it doesn't expect a colon in the timezone
那么有没有办法解析通用的 ISO 8601? (我的输入可能带有 ISO 8601 的不同变体)。
它应该解析的示例输入:
2012-01-01T12:00:00.123456+00:00
2012-01-01T12:00:00.123456+0000
2012-01-01T12:00:00.123456+00
2012-01-01T12:00:00.123456Z
2012-01-01T12:00+00:00 // no seconds
2012-01-01T12:00+0000
2012-01-01T12:00+01
2012-01-01T12:00Z
主要是为了处理 4 种表示 UTC 偏移量的方式(+00:00
、+0000
、+00
和 Z
) 并且有可选的秒和小数秒。
最佳答案
你可以设置Parameter TIMESTAMP_INPUT_FORMAT为AUTO
,
这意味着将识别以下格式:
Supported Formats for AUTO Detection/Timestamp Formats
如果主要问题是冒号,您可以在使用 TIMESTAMP
格式转换之前从输入字符串中去除冒号:
SELECT TO_TIMESTAMP_LTZ(
TRANSLATE('2019-11-25T14:16:36.556 +01:00', ':', ''),
'YYYY-MM-DD"T"HH24MISS.FF TZHTZM'
);
JavaScript 似乎比 Snowflake SQL 识别更多的 ISO 变体,但截断到精度 (3):
CREATE OR REPLACE FUNCTION CONV_TS(DT TEXT) RETURNS VARIANT LANGUAGE JAVASCRIPT STRICT
AS 'return new Date(DT).toJSON()';
SELECT TRY_TO_TIMESTAMP_TZ(TS) TRY_TZ, CONV_TS(TS)::TIMESTAMP_TZ JS_TS, TS FROM VALUES
('2012-01-01T12:00:00.123456+00:00'),
('2012-01-01T12:00:00.123456+0000'), // Also fails TRY%
('2012-01-01T12:00:00.123456+00'), // Fails JS
('2012-01-01T12:00:00.123456Z'),
('2012-01-01T12:00+00:00'),
('2012-01-01T12:00+0000'), // Also fails TRY%
('2012-01-01T12:00+01'), // Fails JS
('2012-01-01T12:00Z') v(ts);
=>
2012-01-01 12:00:00.123 +0000 2012-01-01 12:00:00.123 +0000 2012-01-01T12:00:00.123456+00:00
NULL 2012-01-01 12:00:00.123 +0000 2012-01-01T12:00:00.123456+0000
NULL NULL 2012-01-01T12:00:00.123456+00
2012-01-01 12:00:00.123 +0000 2012-01-01 12:00:00.123 +0000 2012-01-01T12:00:00.123456Z
2012-01-01 12:00:00.000 +0000 2012-01-01 12:00:00.000 +0000 2012-01-01T12:00+00:00
NULL 2012-01-01 12:00:00.000 +0000 2012-01-01T12:00+0000
NULL NULL 2012-01-01T12:00+01
2012-01-01 12:00:00.000 +0000 2012-01-01 12:00:00.000 +0000 2012-01-01T12:00Z
关于datetime - 如何使用 Snowflake SQL 解析 ISO 8601 时间戳?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59030297/