how to execute multiple mysql queries fast

Question

I am using multiple MySQL select queries for getting the result. The output of the first query is Input of the second query, like this, I am using fifteen(15 queries at the time). Because I want to get a result till the 15th stage.

When I execute all these queries it takes too much time to get the output, for ex- it takes more than 15 to 20 min to produce the result.

Basically, there are 15 levels in my code and I am calculating the total amount for each level and that's why I am using 1 query for each level. So the total level is 15 and my MySql query is 15.

I have a DB table where 4 columns are there-

ID, MemberID, SponseredID, Amount.  

I prepared the query to calculate the SUM of Amount of each Level.

you can check the code below:

SELECT SUM(amt) as level1 
FROM adm 
WHERE sid='MT00001';

SELECT SUM(amt) as level2 
FROM adm 
WHERE  sid IN (SELECT mid 
               FROM adm 
               WHERE sid='MT00001');

SELECT SUM(amt) as level3 
FROM adm 
WHERE sid IN (SELECT mid 
              FROM adm 
              WHERE sid IN (SELECT mid 
                            FROM adm 
                            WHERE sid='MT00001'));

SELECT SUM(amt) as level4 
FROM adm 
WHERE sid IN (SELECT mid 
              FROM adm 
              WHERE sid IN (SELECT mid 
                            FROM adm 
                            WHERE sid IN (SELECT mid 
                                          FROM adm
                                          WHERE sid='MT00001')))

This is till level 4 and here also these 4 queries take too much time to execute.

I am getting the result but it takes too much time, approx 15 min to execute all 15 queries.

Answer 1

Don't use IN ( SELECT ... ) ; it used to perform very poorly.

Instead, use JOIN or EXISTS() , depending on the details of what you are doing.

Answer 2

Instead of making subquery for each table, try using join .

For your question use group by clause for each group or category . Search for recursive query .

You may use this for your reference https://docs.microsoft.com/en-us/sql/t-sql/queries/select-group-by-transact-sql?view=sql-server-2017