How to combine multiple columns as one and format with custom strings?

Question

SELECT id,  AS name FROM `table`

Basically is a combination of
lastname + \', \' + firstname

example wo

Answer 1

What about the CONCAT() function?

SELECT id, CONCAT(lastname, ', ', firstname) AS name FROM `table`;

If you are going to concatenate many fields, you could also consider the CONCAT_WS() function, where the first argument is the separator for the rest of the arguments, which is added between the strings to be concatenated:

SELECT id, 
       CONCAT_WS(',', field_1, field_2, field_3, field_4) list
FROM   `table`;

Answer 2

You can use GROUP_CONCAT():

Example of getting all the column names of a table separated by comma:

SELECT GROUP_CONCAT(c.`COLUMN_NAME`) FROM information_schema.`COLUMNS` c
WHERE c.`TABLE_SCHEMA` = "DB_NAME" AND c.`TABLE_NAME`="TABLE_NAME"

Output:

column_name_1,column_name_2,column_name_3,column_name_4,...

Answer 3

SELECT 

CONCAT('https://example.com/estimation/create?pId=',task_p_id,'&estId=',task_est_id) as live_url,

CONCAT('http://stage.example.com/estimation/create?pId=',task_p_id,'&estId=',task_est_id) as stage_url 

FROM `ls_task` LEFT JOIN `ls_estimation` ON est_id=task_est_id LEFT JOIN `ls_project` ON p_id=task_p_id limit 10

Answer 4

use concat like :

SELECT id, CONCAT(lastname, ' , ', firstname) AS name FROM `table`;