Donor-age Distribution per Age Band

The donor-age distribution from the previous example has been constructed without further aggregation. To reduce the result length, the following query sums the number of unique donors per age band using the CASE WHEN statement in the MySQL dialect.

For more advanced users, there are a number of statements and functions available for manipulating the data inside the SQL query in the MySQL 5.7 Manual.

SELECT
    CMTE_ID,
    CASE
        WHEN AGE < 21 THEN '<21'
        WHEN AGE >= 21 AND AGE <= 35 THEN '21-35'
        WHEN AGE >= 36 AND AGE <= 45 THEN '36-45'
        WHEN AGE >= 46 AND AGE <= 55 THEN '46-55'
        WHEN AGE >= 56 AND AGE <= 65 THEN '56-65'     
        ELSE '65+'
    END AS AGE_BAND,
    COUNT(*)
FROM ContributionsByIndividuals
WHERE CYCLE = 2020 AND 
      CMTE_ID IN ('C00580100', 'C00696948', 'C00703975') AND 
      AGE IS NOT NULL
GROUP BY CMTE_ID, AGE_BAND;

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