What are the methods for sorting in Oracle?

1 year ago

Benjamin Taylor

2 minutes

In Oracle, common sorting methods include: 1. ORDER BY clause: using the ORDER BY clause, you can sort by one or more columns. For example:

SELECT * FROM table_name ORDER BY column_name ASC;

SELECT * FROM table_name ORDER BY column_name1 DESC, column_name2 ASC;

Using functions for sorting: Functions can be used to change the order or method of sorting during sorting. For example:

  SELECT * FROM table_name ORDER BY UPPER(column_name) ASC;
  SELECT * FROM table_name ORDER BY LENGTH(column_name) DESC;

3. Sorting using a CASE statement: You can use a CASE statement to sort data based on specific conditions. For example:

SELECT * FROM table_name ORDER BY CASE WHEN condition1 THEN expression1

WHEN condition2 THEN expression2

ELSE expression3

END ASC;

4. Sorting with NULLS FIRST or NULLS LAST: You can use NULLS FIRST or NULLS LAST to specify the ordering of NULL values. For example:

SELECT * FROM table_name ORDER BY column_name ASC NULLS FIRST;

SELECT * FROM table_name ORDER BY column_name DESC NULLS LAST;

Customize the sorting order: You can use the NLS_SORT parameter to customize the sorting order. For example:

SELECT * FROM table_name ORDER BY column_name ASC COLLATE BINARY_AI;

SELECT * FROM table_name ORDER BY column_name DESC COLLATE FRENCH;

Note: The above sorting methods can be combined to meet complex sorting needs.