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Should I put a row number filter in join condition or in a prior CTE?


Should I put a row number filter in join condition or in a prior CTE?

By : RogerSquare
Date : October 17 2020, 01:08 AM
seems to work fine An "Option 0" also exists. A far more traditional "derived table" which simply does not require use of any CTE.
code :
SELECT s.*
       , p.sameday_total
FROM subscription
INNER JOIN (
           SELECT *
             , SUM(payment_amount) OVER (PARTITION BY id, date) 
                 AS sameday_total
             , ROW_NUMBER() OVER (PARTITION BY id, date ORDER BY purchase_number DESC)
                AS sameday_rownum
           FROM payments
           ) p ON s.id = p.id
                  AND p.sameday_rownum = 1


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SQL join filter condition, mysql

SQL join filter condition, mysql


By : Kairath
Date : March 29 2020, 07:55 AM
Hope that helps this depends on the order in which your tables are stated and the order of your wheres. in this case, the where is executed afterwards. so it would be more efficient to declare the tables in the inverse order, since you have the where clause for table1.
the way you do it, all the rows from table1 are joined with the rows from table2 using the on-clause to narrow it down. then, last, the where clause is used on the result of the join. however, like this:
code :
   select avg(Value2) v2 
     from table1 
left join table2 on (year(dte)=yr) 
    where Value>1 
 group by ID;
what is the difference between using filter condition in WHERE clause and JOIN condition

what is the difference between using filter condition in WHERE clause and JOIN condition


By : user3726509
Date : March 29 2020, 07:55 AM
it fixes the issue With an INNER JOIN, there is no difference, either in terms of performance or the definition of the result set. There is a difference with OUTER JOINs.
The WHERE clause filters the results of the FROM after the FROM is evaluated. So, consider these two queries:
code :
SELECT E.id, D.name, E.sal
from EMP E LEFT JOIN
     DEP D
     ON E.id = D.id
WHERE E.sal > 100;

SELECT E.id, D.name, E.sal
from EMP E LEFT JOIN
     DEP D
     ON E.id = D.id AND E.sal > 100;
SELECT E.id, D.name, E.sal
from EMP E RIGHT JOIN
     DEP D
     ON E.id = D.id
WHERE E.sal > 100;

SELECT E.id, D.name, E.sal
from EMP E RIGHT JOIN
     DEP D
     ON E.id = D.id AND E.sal > 100;
Filter condition on multiple Join / Inner Join SQL

Filter condition on multiple Join / Inner Join SQL


By : Rosan Fatih
Date : March 29 2020, 07:55 AM
To fix this issue I'm trying to perform a SQL query with the best possible performance. , I would start with a query that works:
code :
SELECT *
FROM (SELECT vff.*
      FROM inspitravel.villes_france_free vff
      WHERE ville_population_2012 > 10000
      ORDER BY rand()
      LIMIT 1
     ) vff JOIN
     inspitravel.villes_booking vb
     ON vff.ville_nom_reel = vb.full_name; 
SELECT *
FROM (SELECT vff.*
      FROM inspitravel.villes_france_free vff
      WHERE ville_population_2012 > 10000 AND
            rand() < 0.1
      ORDER BY rand()
      LIMIT 1
     ) vff JOIN
     inspitravel.villes_booking vb
     ON vff.ville_nom_reel = vb.full_name; 
SELECT *
FROM (SELECT vff.*
      FROM inspitravel.villes_france_free vff CROSS JOIN
           (SELECT COUNT(*) as cnt FROM inspitravel.villes_france_free vff WHERE ville_population_2012 > 10000
           ) x
      WHERE ville_population_2012 > 10000 AND
            (cnt < 100 OR rand() < 0.1 * cnt)
      ORDER BY rand()
      LIMIT 1
     ) vff JOIN
     inspitravel.villes_booking vb
     ON vff.ville_nom_reel = vb.full_name; 
SQL left join with filter in JOIN condition vs filter in WHERE clause

SQL left join with filter in JOIN condition vs filter in WHERE clause


By : Manoj Kumar
Date : March 29 2020, 07:55 AM
it should still fix some issue The big difference with the Where condition b.status is null or b.status in (10, 100) is when b.status is say 1 as well as b.id=a.id
In the first query you will still get the row from table A with corresponding B part as NULL as On condition is not fully satisfied. In the second query you will get the row in the JOIN for both a and b tables which will be lost in the where clause.
Filter table before inner join condition

Filter table before inner join condition


By : irfan ullah
Date : March 29 2020, 07:55 AM
seems to work fine There's a similar question here, but my doubt is slight different: , First things first:
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