0 - 7 of 7 tags for optimization

This is my query:

There is  "poetic query" that takes forever to run
Kind of looks like this
(case <condition involving tb1 and tb2>) as "Dcol1",
Sum ( col1.tb3),
sum (col2.tb3 ),
sum (col3.tb3)
tb1 left outer join tb2 <condition> LOJ tb3 <conditions>

It's well-known that the application of database optimization techniques can improve query performance.


could you please let me know whether there will be any difference in performance between the following two queries. As i don't have any internal knowledge about sql, i have this doubt.

table A: column alpha has 100 million records
table B: column beta has 45 million records 


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