Menu
How can I best write a query that selects 10 rows randomly from a total of 600k?
827
SELECT * FROM table_name ORDER BY RAND() LIMIT n; Here is the SQL query to get 3 random records in MySQL. Please note, you may get a different result, since it is a random result after all.
The following is the syntax to get the last 10 records from the table. Here, we have used LIMIT clause. SELECT * FROM ( SELECT * FROM yourTableName ORDER BY id DESC LIMIT 10 )Var1 ORDER BY id ASC; Let us now implement the above query.
select FLOOR( RAND() * (maximumValue-minimumValue) + minimumValue) as anyVariableName; Let us check with some maximum and minimum value. The maximum value we are considering is 200 and minimum is 100. The random number will be between 100 and 200 including 100 and 200 itself.
A great post handling several cases, from simple, to gaps, to non-uniform with gaps.
http://jan.kneschke.de/projects/mysql/order-by-rand/
For most general case, here is how you do it:
SELECT name FROM random AS r1 JOIN (SELECT CEIL(RAND() * (SELECT MAX(id) FROM random)) AS id) AS r2 WHERE r1.id >= r2.id ORDER BY r1.id ASC LIMIT 1 This supposes that the distribution of ids is equal, and that there can be gaps in the id list. See the article for more advanced examples
143
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
