As the query set returned by the SELECT statement has no specific order, one can use the ORDER BY clause in the SELECT statement to sort the results in the desired manner.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The PostgreSQL GROUP BY clause is used in collaboration with the SELECT statement to group together those rows in a table that have identical data. Dear sirs, I was very surprised when I executed such SQL query (under PostgreSQL 8.2): select random() from generate_series(1, 10) order by random(); I thought I would receive ten random numbers in random order. Advertisements. Ok I have a table with a indexed key and a non indexed field. I would like to … sql ORDER BY multiple values in specific order? This clause is an optional clause for select statement. Following is the syntax of the … When this attribute is omitted from the ORDER BY clause, the sort order is defaulted to ASC or ascending order.

How LIMIT clause works in PostgreSQL? Python PostgreSQL - Order By. Offset clause will skip the N number of rows before returning the result. Learn more Postgresql order by desc nulls last on every query. The PostgreSQL ORDER BY clause is used to sort the result query set returned by the SELECT statement. By default, B-tree indexes store their entries in ascending order with nulls last. … DESC: Fetch data in descending order by using order by and limit clause in PostgreSQL. In addition to simply finding the rows to be returned by a query, an index may be able to deliver them in a specific sorted order. Indexes and ORDER BY. Is there a configuration option somewhere or anything that will allow me to force postgres to use NULLS LAST on every query that … For example: SELECT last_name, first_name FROM contacts WHERE state = 'California' ORDER BY last_name; The PostgreSQL ORDER BY clause can be used without specifying the ASC or DESC modifier. We can use the limit clause by using the offset clause. Learn more . Active 1 month ago. Usually if you try to retrieve data from a table, you will get the records in the same order in which you have inserted them. But I received ten random numbers sorted numerically: random ----- 0.102324520237744 0.17704638838768 0.533014383167028 0.60182224214077 … Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Active 2 years, 6 months ago. Using the ORDER BY clause, while retrieving the records of a table you can sort the resultant records in ascending or descending order based on the desired column. Next Page . This allows a query's ORDER BY specification to be honored without a separate sorting step. Limit clause is very important in PostgreSQL. Previous Page. The GROUP BY clause follows the WHERE clause in a SELECT statement and precedes the ORDER BY clause. This is done to eliminate redundancy in the output and/or compute aggregates that apply to these groups. I need to find all records with a certain value and return the row. Of the index types currently supported by PostgreSQL, ... An important special case is ORDER BY in combination with LIMIT n: an explicit sort will have to process all the data to identify the first n rows, but if there is an index matching the ORDER BY then the first n rows can be retrieved directly, without scanning the remainder at all. Syntax. Of the index types currently supported by PostgreSQL, only B-tree can produce sorted output — the other index types return matching rows in an unspecified, … Viewed 108k times 91.