Redesign query without using IN statement

user_5346880 0
Viewed 67

I have a query like below. This query is working fine but since I have huge amount of data to check, this query running is slower.

Can anybody help me how to optimize this query?

SELECT * from trn where concat(comp_id,cus_id) 
IN (select concat(comp_id,cus_id) FROM cus where sid='A0001') 
AND docdate between ('2018-01-01') and ('2018-04-30')
mysql sql
3 Answers

The concat is probably causing those performance problems as it can't use indexes.

But MySQL supports multi-column subqueries, so simply remove it:

SELECT * from trn 
where (comp_id,cus_id) IN 
        ( select comp_id,cus_id
          FROM cus 
          where sid='A0001'
        ) 
  AND docdate between ('2018-01-01') and ('2018-04-30')
user_25279050

You can use JOIN, e.g.:

SELECT DISTINCT t.*
FROM trn t 
JOIN cus c ON t.comp_id = c.comp_id AND t.cus_id = c.cus_id
WHERE c.sid='A0001' AND t.docdate BETWEEN ('2018-01-01') AND ('2018-04-30');
user_11207930

You can use EXISTS :

SELECT t.*
FROM trn t
WHERE EXISTS (SELECT 1 
              FROM cus c 
              WHERE c.sid = 'A0001' AND c.comp_id = t.comp_id AND c.cus_id = t.cus_id
             ) AND
      docdate between '2018-01-01' and '2018-04-30';
user_55294450
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