Set - Related information

• What does the helper function of this set mean?

  what does this function mean? when reading api, its explanation is not very clear. ...

  Set java

  Mar.07,2021
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-64f5-1eac120-20a7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eac120-20a7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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