How Can I Group SQL Data by Month and Year for Reporting?

Grouping SQL Data by Month and Year

In a SQL query, it's often necessary to group data by month and year for analysis. This involves creating a new column that represents the desired grouping combination.

Consider the following query:

SELECT MONTH(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, resulting in output like "9" for September. To display the month and year together, we can use the CAST function to convert the month and year values to strings and concatenate them with a hyphen.

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 modification will display the results in the desired format, for example, "9-2011".

Alternatively, we can use the CAST function with leading zeroes to ensure consistent formatting:

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

This will result in output like "2011-09".

The above is the detailed content of How Can I Group SQL Data by Month and Year for Reporting?. For more information, please follow other related articles on the PHP Chinese website!