分享ｊａｖａ帶來的快樂

There are lots of ways to select a random record or row from a database table. Here are some example SQL statements that don't require additional application logic, but each database server requires different SQL syntax.

Select a random row with MySQL:

SELECT column FROM table
                                    ORDER BY RAND()
                                    LIMIT 1
                                    

Select a random row with PostgreSQL:

SELECT column FROM table
                                    ORDER BY RANDOM()
                                    LIMIT 1
                                    

Select a random row with Microsoft SQL Server:

SELECT TOP 1 column FROM table
                                    ORDER BY NEWID()
                                    

Select a random row with IBM DB2

SELECT column, RAND() as IDX
                                    FROM table
                                    ORDER BY IDX FETCH FIRST 1 ROWS ONLY
                                    

Thanks Tim

Select a random record with Oracle:

SELECT id FROM

                                            ( SELECT id from  tbl_lib_question

                                            ORDER BY dbms_random.value )

                                            WHERE rownum <20                                    

Thanks Mark Murphy

Feel free to post other example, variations, and SQL statements for other database servers in the comments.