How Can I Group SQL Data by Month and Year in a Custom 'Month-Year' Format?

SQL Grouping by Month and Year in a Custom Format

When working with timestamps in SQL, it can be useful to group data by specific intervals, such as months or years. However, the default format for the DATE or TIMESTAMP data type may not always align with the desired presentation. In this regard, a common challenge is to display the date in a custom format, such as "month-year".

Consider the following SQL query:

SELECT MONTH(date) + '.' + YEAR(date) AS Mjesec,
       SUM(marketingExpense) AS SumaMarketing,
       SUM(revenue) AS SumaZarada 
FROM [Order]
WHERE (idCustomer = 1) AND (date BETWEEN '2001-11-3' AND '2011-11-3')
GROUP BY MONTH(date), YEAR(date)

This query groups the data by month and year and displays the aggregated sums for marketing expenses and revenue. However, the first column, "Mjesec," currently only shows the month, e.g., "9". To modify the output to display "month-year", a combination of casting and string concatenation is required.

One approach involves casting the month and year values to strings and then concatenating them manually:

SELECT CAST(MONTH(date) AS VARCHAR(2)) + '-' + CAST(YEAR(date) AS VARCHAR(4)) AS Mjesec,
       SUM(marketingExpense) AS SumaMarketing,
       SUM(revenue) AS SumaZarada 
FROM [Order]
WHERE (idCustomer = 1) AND (date BETWEEN '2001-11-3' AND '2011-11-3')
GROUP BY CAST(MONTH(date) AS VARCHAR(2)) + '-' + CAST(YEAR(date) AS VARCHAR(4))

This will output the desired "month-year" format, e.g., "9-2011". Alternatively, as suggested by 40-Love, casting can be performed with leading zeroes, resulting in the following GROUP BY clause:

GROUP BY 
  CAST(YEAR(date) AS VARCHAR(4)) + '-' + right('00' + CAST(MONTH(date) AS VARCHAR(2)), 2) 

This variation adds leading zeroes to ensure that the month is always displayed as a two-digit number.

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