In Hive, you can manipulate strings by reversing and concatenating them using built-in functions.
- REVERSE: The REVERSE function is used to reverse the characters in a string. The syntax for the REVERSE function is as follows
REVERSE(input_string)
For example:
SELECT REVERSE(‘Hello World’); — Returns ‘dlroW olleH’
- CONCAT: The CONCAT function is used to concatenate multiple strings into a single string. The syntax for the CONCAT function is as follows:
CONCAT(string1, string2, …, stringN)
For example:
SELECT CONCAT(‘Hello’, ‘ ‘, ‘World’); — Returns ‘Hello World’
You can also use the vertical bars (||) as a shorthand for the CONCAT function:
SELECT ‘Hello’ || ‘ ‘ || ‘World’; — Returns ‘Hello World’
To reverse and concatenate strings, you can use the REVERSE function together with the CONCAT function:
SELECT CONCAT(REVERSE(‘Hello’), ‘ ‘, REVERSE(‘World’)); — Returns ‘olleH dlroW’
Note that the order of the input strings affects the resulting output string.