1104 - The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay

select counter FROM visitors where browser_ip = '3.235.172.213' AND browser_language = 'en-US,en;q=0.5' AND to_days(now()) - to_days(date) < 1

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