雪花查询以验证日期字段

Question

I need to validate date columns it should have case statement if the the date format it should pass or any other format is should fail and if the date format is any date format it should convert to DD-MM-yyyy format. Can anyone suggest me in snowflake i need to validate the code .

Answer 1

Using TRY_TO_DATE . When the string does not match the provided format NULL is returned instead.

SELECT col, CASE WHEN TRY_TO_DATE(col, 'DD-MM-yyy') IS NULL THEN 'matches format'
                 ELSE 'does not match format'
            END
FROM tab;