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i am trying to fetch users list who older than and between 20 to 60 minute randomly. here is my query

SELECT * 
FROM  t_users 
WHERE create_time <= NOW() -  INTERVAL CONCAT(floor(random()* (60-20 + 1) + 20),' minutes');

it's giving me error ERROR: syntax error at or near "CONCAT"

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    this would be valid in MySQL but not in PostgreSQL world Commented Oct 5, 2020 at 13:42

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You can't use concat() like that to create an interval. The easiest solution is to use make_interval:

WHERE create_time <= NOW() - make_interval(mins => (floor(random()* (60-20 + 1) + 20))::int )
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