How to remove the non-null restriction of a value in a database table

because the value of adding data on the page will be empty, but the value of the database table is not empty, so it always fails to add data. How can we remove the restriction that the data in the database table is not empty?

Mar.22,2021

Please find your own alter usage. Just change the settings of the corresponding fields.

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-64f5-1b39354-2c181.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b39354-2c181.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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