Mysql joint check for advice

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ke_orderske_userinfoid
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May.24,2022

according to Ali's development specification

more than three tables prohibit join. For fields that need join, the data types are absolutely consistent; when you associate a query with multiple tables, make sure that the associated fields need to be indexed.

there is no problem with this as long as the index can be used.

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-64f5-1b32a40-2b5a9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b32a40-2b5a9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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