PostgreSQL GROUP BY: Sort & Group Data

1 year ago
Benjamin Taylor
1 minute

In PostgreSQL, you can use the GROUP BY clause to group rows and the ORDER BY clause to sort each group.

Here is an example of grouping and ordering a table using GROUP BY and ORDER BY:

SELECT column1, column2, ...
FROM table
GROUP BY column1, column2, ...
ORDER BY column1, column2, ...;

In the query above, you need to specify the columns you want to group and sort. The GROUP BY clause will group rows based on the specified columns, while the ORDER BY clause will sort each group. You can specify multiple columns as needed.

Please note that the ORDER BY clause comes after the GROUP BY clause. This is because the rows must first be grouped before they can be sorted within each group.

In grouping and sorting, you can also use aggregate functions (such as SUM, COUNT, etc.) to calculate summary data for each group. For example:

SELECT column1, SUM(column2) AS total
FROM table
GROUP BY column1
ORDER BY total DESC;

The query above will calculate the total sum of each value in column1 and sort the results in descending order based on the sum.

Hope this is helpful to you!

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