Is there a way to update random records?
I have a database of 5.6 million records and I want to pull out 5000
records and mark a field in the database that I've pulled these so that I
don't pull the same 5000 again.
I know I can select the records by doing:
SELECT * FROM 5600k WHERE picked IS NULL ORDER BY rand() LIMIT 5000;
But what I really want to do is:
UPDATE 5600k SET picked=1 WHERE picked IS NULL ORDER BY rand() LIMIT 5000;
Then doing:
SELECT * FROM 5600k WHERE picked=1;
Then resetting the table so I can pick a random selection again later:
UPDATE 5600k SET picked=0 WHERE picked=1;
So can the update statement be done to update random records?
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