Athena - String to Date 覆盖

Question

I want to convert below string to only date column. the column has both time and date stored as string

String 2021-01-01 12:43:58 ==> 2021-01-01

Answer 1

You achieve what you want with this query:

SELECT
cast(date_parse(column, '%Y-%m-%d') as date)
FROM
table

Answer 2

You can use date_format with date_parse or cast as date to achieve this:

SELECT date_format(date_parse('2021-01-01 12:43:58', '%Y-%m-%d %h:%i:%s'),'%Y-%m-%d')

will give 2021-01-01

Just replace the timestamp with column name

SELECT date_format(date_parse(<timestamp_column>, '%Y-%m-%d %h:%i:%s'),'%Y-%m-%d')

Now using cast as shown below

SELECT cast(date_parse('2021-01-01 12:43:58', '%Y-%m-%d %h:%i:%s') as date)

similarly replace timestamp with column name

Answer 3

For what is worth, here's a solution without casting back and forth from string to date:

select substr(column,1,10) from mytable