How to get today -“1 day” date in sparksql?

Question

How to get current_date - 1 day in sparksql, same as cur_date()-1 in mysql.

Answer 1

The arithmetic functions allow you to perform arithmetic operation on columns containing dates.

For example, you can calculate the difference between two dates, add days to a date, or subtract days from a date. The built-in date arithmetic functions include datediff, date_add, date_sub, add_months, last_day, next_day, and months_between.

Out of above what we need is

date_sub(timestamp startdate, int days), Purpose: Subtracts a specified number of days from a TIMESTAMP value. The first argument can be a string, which is automatically cast to TIMESTAMP if it uses the recognized format, as described in TIMESTAMP Data Type. Return type: Returns the date that is > days days before start

and we have

current_timestamp() Purpose: Alias for the now() function. Return type: timestamp

you can do select

date_sub(CAST(current_timestamp() as DATE), 1)

See https://spark.apache.org/docs/1.6.2/api/java/org/apache/spark/sql/functions.html