ORDER BY clause - Oracle

If you want all the results sorted in descending order, use your ORDER BY clause, you must use the DESC keyword immediately after the name or the number of the corresponding column. For the sorting of mixed NULL and non-NULL values in Oracle, you can specify which one should appear first. This, however, is very Oracle-specific, and is against the SQL standard, where a sub-query result is unordered (i.e. the order by clause may be ignored by the DBMS). You can do this by adding a column alias to the columns or expressions in the SQL-statement SELECT-list The WHERE clause and the SELECT list of say, the database, the rows that you want your SELECT-retrieve statement. Please note: the DESC keyword in the ORDER BY clause. (You can request the ASC keyword to explicitly ascending order, but it is not necessary, because the ascending order is the default.). You separate the list of columns (or SELECT in the column list, sequence numbers) in the ORDER BY clause, by a comma. For example, you might want to see a list of all the clients as per their name alphabetically, or display all customers in the order from the lowest to the highest credit limit. For example, Listing 12 shows the use of a format model (sometimes also called format mask ) to be applied to the SALARY column. You can fix the problem by nesting the queries to combine and convert the string to a date after the CLEAR and before the ORDER BY. Because it has attracted low-quality or spam answers, which had to be removed, the posting needed a reply now 10 reputation on this site (the Association bonus does not count ). As Listing 11 shows, you can't provided a column alias in the query's ORDER BY clause, it is enclosed in double quotation marks in the SELECT list. The results are sorted in columns after the first column, then the second, and so on for as many as the ORDER BY clause contains. To read the meaning carefully (and read) your statements while debugging, can not be overemphasized. By using the NULLS FIRST or NULLS LAST option in the ORDER BY clause, the default settings can override and explicitly specify how you want the null sorted values.

Introduction to Oracle ORDER BY clause In Oracle, a table stores rows in an unknown order, regardless of the order of the rows inserted into the database. Some error messages make it easy to understand what you did wrong, while others not so easy. For example, two different dates (1. October 2010, 10:15:15, and 1. October 2010, 23:45:50) could be the same character, it forces Oracle to eliminate one of the two 01-10-2010' strings, but the two dates that would otherwise be sorted. In this case, you could change, GETDATE() , DATEADD() and add some obscenely large number of days or years to the current date. The ORDER BY clause allows sorting of the data, the consequences of multiple columns, where each column can have different sort orders. C) sort the rows of the column positions example, you do not need to specify the name of the columns for sorting the data. Follow the name of the column the sorting is can be order: ASC for ascending, DESCENDING for sorting in descending order by default, the ORDER BY clause sorts the rows in ascending order, if you specify ASC or not. For example, you might want to have a list of all the employees in the order they were set, you will be shown all of the employees in the order of highest to lowest annual salary, or a list of the surnames of all the employees in the accounting Department in alphabetical order.

Oracle / PLSQL: ORDER BY Clause - techonthenetcom

How to format and sort a date in Oracle? - Stack Overflow

The query in Listing 3 retrieves all employees from the most recent to the least recent date of hire. You can change certain environment settings for your session without impact to other connected sessions (logged in users). Listing 9 shows a list of employees, sorted according to the most recent, least recent date of hire, during which employees are sorted in alphabetical order by last name. To query the rows in ascending or descending order in a column, you need to instruct it explicitly to do Oracle database that you want this. You have seen the DESC NULLS FIRST and NULLS LAST options behave and how null values are treated by default in an ORDER BY clause. A new database, including sample user accounts and their associated schemas are created for you. Now you know how to narrow the scope of the data a query retrieves, you are ready to learn how to type (or order ) of the data. To mention simple typos, misplaced or missing commas, and unpaired, single quotation marks (to a couple of common errors) can cause a variety of problems, where the solution may not be immediately obvious Can you post a test case that reproduces the problem (i.e., CREATE TABLE statements DML to insert a few sample rows, and the query that generated the exception). Conversely, if an ORDER BY clause specifies descending order for a column containing null values, displayed as in Listing 7, the null values are presented first by default.