“Comment trouver la médiane en SQL pour l'IDD et même” Réponses codées

Trouvez la médiane en SQL

# FOR TABLES WITH ODD NUMBER OF ROWS

# For column1 in table1 with 'n' number of rows. Where 'n' is an odd number.
# 1. Change all column1 and table1 to your column and table name.
# 2. Calculate (n/2)+0.5, where n=number of rows, and set it as LIMIT for t1.

SELECT *
FROM (SELECT column1
      FROM table1
      ORDER BY column1
      LIMIT (n/2)+0.5) AS t1
ORDER BY column1 DESC
LIMIT 1;
Kwams

Comment trouver la médiane en SQL pour l'IDD et même

/*
HACKER RANK MYSQL SOLUTION.
*/
SET @rowindex := -1;
 
SELECT
   ROUND(AVG(N.LAT_N),4)
FROM
   (SELECT @rowindex:=@rowindex + 1 AS rowindex,
           STATION.LAT_N AS LAT_N
    FROM STATION
    ORDER BY STATION.LAT_N) AS N
WHERE
N.rowindex IN (FLOOR(@rowindex / 2) , CEIL(@rowindex / 2));
Aggressive Aardvark

Comment trouver la médiane d'une colonne SQL

SET @rowindex := -1;
 
SELECT
   AVG(g.grade)
FROM
   (SELECT @rowindex:=@rowindex + 1 AS rowindex,
           grades.grade AS grade
    FROM grades
    ORDER BY grades.grade) AS g
WHERE
g.rowindex IN (FLOOR(@rowindex / 2) , CEIL(@rowindex / 2));
Disgusted Dingo

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