How do I cast a date format in hive?

How do I cast a date format in hive?

Hive from_unixtime() is used to get Date and Timestamp in a default format yyyy-MM-dd HH:mm:ss from Unix epoch seconds. Specify the second argument in pattern format to return date and timestamp in a custom format.

How do I get the current date in Hive query?

6 Answers. According to the LanguageManual, you can use unix_timestamp() to get the “current time stamp using the default time zone.” If you need to convert that to something more human-readable, you can use from_unixtime(unix_timestamp()) . Hope that helps. yyyy-MM-dd – if you wish to change the format to a diff one.

Is date function in hive?

Date data types do not exist in Hive. In fact the dates are treated as strings in Hive. The date functions are listed below. This function returns the number of seconds from the Unix epoch (1970-01-01 00:00:00 UTC) using the default time zone.

How do I use the cast function in hive?

Hive CAST String to Integer Data Types When you casting String value within the ranges of each data type, you will get numeric as an output. when a value is out of range you will get NULL . In the last example, 128 is out of range for TINYINT hence it returns NULL value when you cast.

How do I extract year from date in hive?

The TO_DATE function returns the date part of the timestamp in the format ‘yyyy-MM-dd’. YEAR( string date ) : The YEAR function returns the year part of the date.

How do I compare two dates in hive?

unix_timestamp() returns an int: current time in seconds since epoch. from_unixtime(,’yyyy-MM-dd’) converts to a string of the given format, e.g. ‘2012-12-28′ date_sub(,180) subtracts 180 days from that string, and returns a new string in the same format. unix_timestamp(,’yyyy-MM-dd’) converts that string back to an …

How do I find the difference between two dates in hive?

If you need the difference in seconds (i.e.: you’re comparing dates with timestamps, and not whole days), you can simply convert two date or timestamp strings in the format ‘YYYY-MM-DD HH:MM:SS’ (or specify your string date format explicitly) using unix_timestamp(), and then subtract them from each other to get the …

What is the default execution engine in hive?

Options are: mr (Map Reduce, default), tez (Tez execution, for Hadoop 2 only), or spark (Spark execution, for Hive 1.1. 0 onward). While mr remains the default engine for historical reasons, it is itself a historical engine and is deprecated in the Hive 2 line (HIVE-12300).

How do I convert a double to a string in hive?

Hive converts double to scientific representation while cast to string because Hive treats double itself in a same way. Therefore, problem is not with cast to string. See below example: select 9999999902.0, cast(9999999902.0 as BIGINT), cast(cast(9999999902.0 as BIGINT) as string) from ..

How do I get the month from a date in hive?

Hive Extract Function Examples

  1. Hive extract year from date.
  2. Apache Hive extract month from date hive> select date_format(current_timestamp,’MM’); OK 01 Time taken: 0.098 seconds, Fetched: 1 row(s)

How do I get the month and year in hive?