How to Replace Characters in Hive

1 year ago
Isabella Edwards
1 minute

To replace characters at a specific position in Hive, you can use the SUBSTRING and CONCAT functions. Here is an example:

Assume we have a table containing strings that need to be replaced.

CREATE TABLE test_table (
    id INT,
    string_column STRING
);

INSERT INTO test_table VALUES
(1, 'abcdefg');

Now, suppose we want to replace the third character (i.e. the character at position 2) in a string with “h”, we can achieve this using the following query:

SELECT 
    id,
    CONCAT(
        SUBSTRING(string_column, 1, 2),
        'h',
        SUBSTRING(string_column, 4)
    ) AS replaced_string
FROM test_table;

This will result in the following output:

+----+---------------+
| id | replaced_string |
+----+---------------+
| 1  | abhdefg       |
+----+---------------+

In this example, we used the SUBSTRING function to extract a substring from the first character to the second character in the original string, and then concatenated the replaced character “h” with the remaining string using the CONCAT function.

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