How to Query Data Group By With Order By In Oracle?

To query data in Oracle using the GROUP BY clause with the ORDER BY clause, you can use the following syntax:

SELECT column1, column2, aggregate_function(column3) FROM table_name GROUP BY column1, column2 ORDER BY column1, column2;

In this syntax, you specify the columns you want to include in the select statement, along with any aggregate functions you want to use. You then use the GROUP BY clause to group the results by one or more columns. Finally, you can use the ORDER BY clause to specify the order in which you want the results to be displayed.

For example, if you have a table called "sales" with columns for "product", "region", and "sales_amount", you can group the data by product and region and order the results by product and region as follows:

SELECT product, region, SUM(sales_amount) FROM sales GROUP BY product, region ORDER BY product, region;

How to sort the grouped data in descending order in Oracle?

To sort grouped data in descending order in Oracle, you can use the ORDER BY clause with the DESC keyword after the column name you want to sort by.

Here is an example query:

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SELECT column1, column2, COUNT(*)
FROM table_name
GROUP BY column1, column2
ORDER BY COUNT(*) DESC;

This query will group the data by column1 and column2, and then order the grouped data in descending order based on the COUNT of rows in each group.

How to sort the result set of a grouped query in Oracle?

To sort the result set of a grouped query in Oracle, you can use the ORDER BY clause. Here is an example of how you can do this:

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SELECT department_id, COUNT(*) as employee_count
FROM employees
GROUP BY department_id
ORDER BY employee_count DESC;

In this example, we are grouping the employees by department_id and counting the number of employees in each department. We then use the ORDER BY clause to sort the result set in descending order based on the employee_count. You can also specify multiple columns in the ORDER BY clause to sort the result set by multiple columns.

What is the difference between group by and order by in Oracle?

GROUP BY is used to group rows that have the same values into summary rows, whereas ORDER BY is used to sort the results of a query in either ascending or descending order.

With GROUP BY, you can use aggregate functions such as SUM, AVG, COUNT, etc. to perform calculations on grouped data.

ORDER BY, on the other hand, simply sorts the result set based on one or more columns, without performing any calculations or grouping of data.

How to display the total count of rows in a grouped query in Oracle?

You can display the total count of rows in a grouped query in Oracle by using the COUNT() function along with the GROUP BY clause.

Here is an example query that demonstrates how to display the total count of rows in a grouped query in Oracle:

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SELECT column1, COUNT(*) AS total_count
FROM your_table
GROUP BY column1;

In this query, replace "column1" with the column you are grouping by and "your_table" with the name of your table. The COUNT(*) function will calculate the total count of rows for each group specified in the GROUP BY clause. The result will include two columns - the grouped column and the total count of rows for each group.