Mysql how do I get the comment corresponding to the value of the data field when I query a piece of data in the table?

for example, selece a from b, how do I know the comments of a?
solve

Mar.05,2021

this is not allowed. If you query it, you will find useful results. If you look at the comments first, you can only view the structure of the table

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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-64f5-1b2c2de-2a839.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2c2de-2a839.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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