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Overview

The CONCAT() function is used to concatenate one or more input values into a single result. It supports all data types in Oxla, except TIMESTAMPTZ, and the output will be returned as a concatenation of the input values. Special cases: Returns NULL if there are no input rows or NULL values.

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Examples

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Case 1: Basic CONCAT() function

The below example uses the CONCAT() function to concatenate three values = into a single result: 
SELECT CONCAT ('Oxla', '.', 'com') AS "Website";
The final result will be as follows: 
+------------+
| Website    |
+------------+
| Oxla.com   |
+------------+

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Case 2: CONCAT() function using column

We have an example of a payment table that stores customer payment data. 
CREATE TABLE payment (
  paymentid int,
  custFirstName text,
  custLastName text,
  product text,
  ordertotal int
);
INSERT INTO payment
    (paymentid, custFirstName, custLastName, product, ordertotal)
VALUES
    (9557451,'Alex','Drue','Latte',2.10),
    (9557421,'Lana','Rey','Latte',2.10),
    (9557411,'Tom','Hanks','Americano',1.85),
    (9557351,'Maya','Taylor','Cappuccino',2.45),
    (9557321,'Smith','Jay','Cappuccino',2.45),
    (9557311,'Will','Ritchie','Americano',1.85);

SELECT * FROM payment;
The above query will display the following table: 
+------------+----------------+----------------+--------------+---------------+
| paymentid  | custFirstName  | custLastName   | product      | ordertotal    |
+------------+----------------+----------------+--------------+---------------+
| 9557451    | Alex           | Drue           | Latte        | 2.10          |
| 9557421    | Lana           | Rey            | Latte        | 2.10          |
| 9557411    | Tom            | Hanks          | Americano    | 1.85          |
| 9557351    | Maya           | Taylor         | Cappuccino   | 2.45          |
| 9557321    | Smith          | Jay            | Cappuccino   | 2.45          |
| 9557311    | Will           | Ritchie        | Americano    | 1.85          |
+------------+----------------+----------------+--------------+---------------+
The following query will concatenate values in the custFirstName and custLastName columns of the payment table: 
SELECT CONCAT  (custFirstName, ' ', custLastName) AS "Customer Name"
FROM payment;
It will display an output where spaces separate the first and last names. 
+-----------------+
| Customer Name   |
+-----------------+
| Tom Hanks       |
| Lana Rey        |
| Alex Drue       |
| Will Ritchie    |
| Smith Jay       |
| Maya Taylor     |
+-----------------+

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Case 3: CONCAT() function with NULL

We use the CONCAT() function in the following example to concatenate a string with a NULL value: 
SELECT CONCAT('Talent Source ',NULL) AS "concat";
The result shows that the CONCAT function will skip the NULL value: 
+------------------+
| concat           |
+------------------+
| Talent Source    |
+------------------+