How to store duplicate column values in the secondary index of innodb's b + tree

how does innodb assist store duplicate column values

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stored with extra pages like this? ask the boss to answer
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Jan.28,2022

Why should duplicate columns be emphasized?
whether repeated or not, the storage method is the same


excuse me, has the landlord found the answer? I am looking for the answer to this question

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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-64f5-1b32fe4-2be68.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b32fe4-2be68.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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