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Implement Harmonic mean and Quadratic mean in MySQL?
Let us first create a table −
mysql> create table DemoTable1606 -> ( -> Value int -> ); Query OK, 0 rows affected (0.55 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1606 values(5); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1606 values(10); Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1606;
This will produce the following output −
+-------+ | Value | +-------+ | 5 | | 10 | +-------+ 2 rows in set (0.00 sec)
Here is the query to implement Harmonic mean and Quadratic mean in MySQL −
mysql> select (count(*)/sum(1/Value)) as HarmonicMean, -> sqrt(sum(Value * Value)/count(*)) as QuadraticMean -> from DemoTable1606;
This will produce the following output −
+--------------+-------------------+ | HarmonicMean | QuadraticMean | +--------------+-------------------+ | 6.6667 | 7.905694150420948 | +--------------+-------------------+ 1 row in set (0.03 sec)
Updated on: 16-Dec-2019
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