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What is the most efficient way to select a specific number of random rows in MySQL?
Use RAND() method for random and to limit a number of records, use the LIMIT() method in MySQL.
Let us first create a table −
mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (0.54 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(300); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(600); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(700); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(1000); Query OK, 1 row affected (0.15 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+-------+ | Value | +-------+ | 100 | | 300 | | 600 | | 700 | | 1000 | +-------+ 5 rows in set (0.00 sec)
Following is the query to get a specific number of rows with random records −
mysql> select *from DemoTable order by rand() limit 4;
Output
+-------+ | Value | +-------+ | 1000 | | 600 | | 100 | | 700 | +-------+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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