SQL - Using the results of subquery in SELECT in the SELECT

Question

Example:

SELECT
    (
        ...
    ) AS imageName,
    (
        ...
    ) AS imageURL,
    CONCAT(imageName, ' ', imageURL)

How could I achieve this?

Answer 1

You can do the following but watch out the tables' aliases:

   SELECT
     T.imageName, T.imageURL
     CONCAT(imageName, ' ', imageURL)
   FROM 
   (
       SELECT
      (
        ...
       ) AS imageName,
       (
        ...
      ) AS imageURL
       FROM ... AS innerT
   ) T

Answer 2

您可以在CONCAT内完成所有操作，如下所示：

select CONCAT(( select ... ), ' ', ( select ... ))