Question

Notice that I’m calling and joining the same tables for my main query and subquery.

Now my actually query is using many more subqueries like that.

Is there a way to call a subquery field from the main query thus eliminating the need to reuse the same join tables in the subqueries? I want to make it more efficient without sacrificing speed.

SELECT tb1.id, tb1.title,

(SELECT tb1.title 
FROM table1 AS tb1
JOIN table2 AS tb2 ON tb2.id = tb1.id 
LEFT JOIN table3 AS tb3 ON tb2.id = tb3.id 
WHERE tb1.id > '123' LIMIT 1) AS next

FROM table1 AS tb1
JOIN table2 AS tb2 ON tb2.id = tb1.id 
LEFT JOIN table3 AS tb3 ON tb2.id = tb3.id
WHERE tb1.id='123'

Answer 1

You can use a View to abstract that query.

CREATE VIEW tbl_view AS 
SELECT 
tb1.id as id,
tb1.title as title  
FROM table1 AS tb1
JOIN table2 AS tb2 ON tb2.id = tb1.id 
LEFT JOIN table3 AS tb3 ON tb2.id = tb3.id

The shorter query would be

SELECT 
  id, 
  title,
  (SELECT title FROM tbl_view
  WHERE id > '123' LIMIT 1) AS next
FROM 
  tbl_view
WHERE id='123'