日期转换为雪花中的年月

Question

I am attempting to convert a date (formatted as yyyy-mm-dd) to a year-month format (ex: 2021-07) while keeping the date datatype.

Coming from SQL Server, this could be done using the FORMAT function like this:

SELECT FORMAT(date_column, 'yyyy-MM')

I am wondering how this could be achieved in SNOWFLAKE . I couldn't find the FORMAT function in SNOWFLAKE so I attempted with DATE, DATE_PART, but they all seem to make my column a varchar, losing its date type.

Thanks.

Answer 1

FORMAT的等价物是TO_VARCHAR ：

 TO_VARCHAR( <date_or_time_expr> [, '<format>' ] )

SELECT TO_VARCHAR(date_column, 'yyyy-MM')

Answer 2

TO_DATE()这样做，就像TO_DATE(date_column, 'yyyy-MM')见https://docs.snowflake.com/en/sql-reference/functions/to_date.html