在 Snowflake SELECT 中将 TIMESTAMP_TZ 转换为 TIMESTAMP_NTZ

Question

I have a tables in Snowflake that have fields of both TIMESTAMP_TZ and TIMESTAMP_NTZ types.

I would like to do a SELECT * FROM <table> such that all TIMESTAMP_TZ fields are read as TIMESTAMP_NTZ (using TO_TIMESTAMP_NTZ() function).

How do I implement such a query?

Answer 1

Do you get any error when you use TO_TIMESTAMP_NTZ?

WITH sample_data AS (
SELECT '2020-11-22 20:00'::timestamp_tz A)
SELECT TO_TIMESTAMP_NTZ(A) FROM sample_data;

Answer 2

If it's just the matter of how it is displayed, you could do:

alter session set TIMESTAMP_TZ_OUTPUT_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF3'; 
select * from table_name;