How does MySQL get data from each room every two days?

how do I get the data for the first 30 days, every two days?

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Feb.28,2021

written at an interval of 2 days:

SELECT * FROM `dates` WHERE DATEDIFF(`date`, '2018-01-01') % 2 = 0;

the first 30 days should be able to write by yourself ^ _ ^

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1c28567-5653a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1c28567-5653a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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