How to Correctly Group JSON Timestamp Data by Year and Month in MySQL?

Formatting JSON by Year and Month in MySQL

Organizing data into logical groupings is often essential for presenting insights effectively. In this case, you aim to group a table's timestamp records into years and months based on a specific JSON format.

To achieve this, you initially attempted to use the following query:

SELECT
    MONTHNAME(t.summaryDateTime) as month, YEAR(t.summaryDateTime) as year
FROM
    trading_summary t 
GROUP BY MONTH(t.summaryDateTime) DESC

However, this query groups months across different years, producing results that deviate from the desired JSON format.

The key to proper grouping lies in the GROUP BY clause. To group data by both month and year, modify the query as follows:

SELECT
    MONTHNAME(t.summaryDateTime) as month, YEAR(t.summaryDateTime) as year
FROM
    trading_summary t 
GROUP BY YEAR(t.summaryDateTime), MONTH(t.summaryDateTime) DESC

By adding YEAR(t.summaryDateTime) to the GROUP BY clause, you ensure that the data is grouped by year first, followed by grouping within each year by month. This modification aligns the results with the desired JSON format.

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