Mean and mode in SQL Server
Problem Statement
Mean is the average of a given data set, calculated by dividing the sum by the number of values in the data set.
The mode of the data set is the value that appears most frequently in a series of data
If our data set is {1, 2, 3, 4}, the average value is − (1 2 3 4) / 4 = 2.5
If our data set is {1, 2, 3, 4, 1, 1, 1, 1}, the mode is − 1 because it occurs 5 times .
Example
- First, create a table-
CREATE TABLE NUMBERS ( value INT )
- Insert data into the table-
INSERT INTO NUMBERS VALUES (1); INSERT INTO NUMBERS VALUES (2); INSERT INTO NUMBERS VALUES (3); INSERT INTO NUMBERS VALUES (4);
- Use the following query to find the mean -
SELECT AVG(val) FROM NUMBERS;
- Insert pattern-less rows with duplicate values-
INSERT INTO NUMBERS VALUES (1); INSERT INTO NUMBERS VALUES (1); INSERT INTO NUMBERS VALUES (1); INSERT INTO NUMBERS VALUES (1);
- Use the following query to find the pattern -
SELECT TOP 1 val FROM NUMBERS GROUP BY val ORDER BY COUNT(*) DESC
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