MySQL-extract a number from db and use it in same query

Question

table 1 in my db has many columns including id and time . an id is sent to the server, then I have to extract its corresponding time (let's say t ) from table and run a query like this:

SELECT * FROM(
(SELECT * FROM table1 WHERE time>t AND ...clause 1...) // query A
UNION
(SELECT * FROM table1 WHERE time>t AND ...clause 2...) // query B
) h LIMIT 24;

how to include a subquery in the query mentioned above which extracts t and makes it accessible by query A and query B?

Answer 1

I think you need Mysql WITH (Common Table Expression) here,

WITH CTE AS (
  SELECT * FROM table1 WHERE time>t
)

SELECT * FROM (
  (SELECT * FROM CTE AND ...clause 1...) // query A
UNION
 (SELECT * FROM CTE AND ...clause 2...) // query B
) h LIMIT 24;