Simple Percentage Calculation in MySQL

Simple Percentage Calculation in MySQL

In MySQL, you can perform a simple percentage calculation using the following formula:

Percentage=(WholePart​)×100

Here's an example query illustrating a simple percentage calculation:

-- Example data CREATE TABLE ExampleData ( id INT PRIMARY KEY, part INT, whole INT ); -- Insert some data INSERT INTO ExampleData (id, part, whole) VALUES (1, 20, 100), (2, 75, 200), (3, 30, 50); -- Calculate percentage SELECT id, part, whole, (part / whole) * 100 AS percentage FROM ExampleData;

In this example:

  • part represents the part of the whole.
  • whole represents the whole.

The query calculates the percentage by dividing the part by the whole and then multiplying the result by 100.

Adjust the column names and table names based on your actual schema. If your data includes decimal values, you may want to use the CAST function to ensure accurate calculations. For example:

SELECT id, part, whole, CAST((part / whole) * 100 AS DECIMAL(10, 2)) AS percentage FROM ExampleData;

This ensures that the result is a decimal number with two digits after the decimal point.

Examples

  1. Calculate Percentage of a Column in MySQL:

    SELECT YourColumn, YourColumn * 100 / SUM(YourColumn) OVER () AS Percentage FROM YourTable;

    Description: Calculates the percentage of each row in YourColumn relative to the sum of all values in YourColumn.

  2. MySQL Percentage Calculation Using COUNT:

    SELECT COUNT(*) AS TotalRows, COUNT(*) * 100 / (SELECT COUNT(*) FROM YourTable) AS Percentage FROM YourTable;

    Description: Calculates the percentage of rows in the table based on the total number of rows.

  3. Calculate Percentage Change in MySQL:

    SELECT YourColumn, YourColumn - LAG(YourColumn) OVER (ORDER BY YourOrderColumn) AS Change, (YourColumn - LAG(YourColumn) OVER (ORDER BY YourOrderColumn)) * 100 / LAG(YourColumn) OVER (ORDER BY YourOrderColumn) AS PercentageChange FROM YourTable;

    Description: Calculates the percentage change between consecutive rows in YourColumn.

  4. MySQL Percentage Calculation with GROUP BY:

    SELECT YourGroupColumn, COUNT(*) * 100 / SUM(COUNT(*)) OVER (PARTITION BY YourGroupColumn) AS Percentage FROM YourTable GROUP BY YourGroupColumn;

    Description: Calculates the percentage of each group in YourGroupColumn based on the total count within that group.

  5. Calculate Percentage of Total in MySQL:

    SELECT YourColumn, YourColumn * 100 / (SELECT SUM(YourColumn) FROM YourTable) AS Percentage FROM YourTable;

    Description: Calculates the percentage of each row in YourColumn relative to the total sum of YourColumn.

  6. MySQL Percentage Calculation with WHERE Clause:

    SELECT COUNT(*) * 100 / (SELECT COUNT(*) FROM YourTable WHERE YourCondition) AS Percentage FROM YourTable WHERE YourCondition;

    Description: Calculates the percentage of rows satisfying a condition in the table.

  7. Calculate Percentage Rank in MySQL:

    SELECT YourColumn, PERCENT_RANK() OVER (ORDER BY YourColumn) AS PercentageRank FROM YourTable;

    Description: Calculates the percentage rank of each row in YourColumn based on its order.

  8. MySQL Percentage Calculation Using SUM and CASE:

    SELECT YourCategory, SUM(CASE WHEN YourCondition THEN 1 ELSE 0 END) * 100 / COUNT(*) AS Percentage FROM YourTable GROUP BY YourCategory;

    Description: Calculates the percentage of rows satisfying a condition within different categories.

  9. Calculate Running Percentage Total in MySQL:

    SELECT YourColumn, SUM(YourColumn) OVER (ORDER BY YourOrderColumn) * 100 / SUM(YourColumn) OVER () AS RunningPercentage FROM YourTable;

    Description: Calculates the running percentage total of YourColumn based on the order specified by YourOrderColumn.

  10. MySQL Percentage Calculation with Subquery:

    SELECT YourColumn, YourColumn * 100 / (SELECT MAX(YourColumn) FROM YourTable) AS Percentage FROM YourTable;

    Description: Calculates the percentage of each row in YourColumn relative to the maximum value of YourColumn in the table.

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