How can I reach a composite picture with himself?

I have a query like this:
select *
from
    (
        select a,c,d
        from
            (
                select a,b,c 
                from table1
                where condition1 and condition2
            ) t1
         left join
            (
                select c,d,e,f,max(g)
                from table2
                where condition3 and condition4
                group by c,d,e,f
                having max(g)>5
            )t2
         on
            a=c
            and b=e
    )t3
left join
    (
        select a,c,d
        from
            (
                select a,b,c 
                from table1
                where condition1 and condition2
            ) t1
         left join
            (
                select c,d,e,f,max(g)
                from table2
                where condition3 and condition4
                group by c,d,e,f
                having max(g)>5
            )t2
         on
            a=c
            and b=e
    )t4
    on
        t3.a=t4.a+1
    
As you can see in the query above, t3 and t4 is identical. Is there a way that I don't have to retype the same subquery over and over again? And if possible I want to avoid using views, unless it's really the only way to go. Thank you

You can use with the clause,

WITH table_data
     AS (SELECT a, c, d
           FROM    (SELECT a, b, c
                      FROM table1
                     WHERE condition1
                           AND condition2) t1
                LEFT JOIN
                   (  SELECT c, d, E, f, MAX (G)
                        FROM table2
                       WHERE condition3
                             AND condition4
                    GROUP BY c, d, E, f
                      HAVING MAX (G) > 5) t2
                ON a = c
                   AND b = E)
SELECT *
  FROM table_data t1 LEFT JOIN table_data t2 ON t1.a = t2.a + 1;

G.

Tags: Database

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