apache derby order by clause

In Apache Derby, the ORDER BY clause is used in conjunction with the SELECT statement to sort the rows of a result set in either ascending or descending order based on one or more columns.

Here is the basic syntax of an ORDER BY clause:

SELECT column1, column2, ...
FROM table_name
ORDER BY column1 [ASC | DESC], column2 [ASC | DESC], ...;

In this syntax, the column1, column2, etc. are the columns that you want to sort the rows by. The optional ASC or DESC keyword specifies the sort order. By default, ORDER BY sorts the result set in ascending order.

Here are some examples of using the ORDER BY clause in Apache Derby:

SELECT name, age, gpa
FROM students
ORDER BY name ASC;

This statement selects the name, age, and gpa columns from the students table and sorts the result set by the name column in ascending order.

SELECT name, age, gpa
FROM students
ORDER BY gpa DESC, age ASC;

This statement selects the name, age, and gpa columns from the students table and sorts the result set first by the gpa column in descending order and then by the age column in ascending order.

By using the ORDER BY clause in Apache Derby, you can create powerful queries that sort your data based on specific criteria. It's important to be careful when using the ORDER BY clause, as it can have a significant impact on your application performance when sorting large result sets. If possible, you should limit the number of rows returned by your queries using the WHERE clause and other filtering techniques.