Backend-development-of - Related information

• Questions about the performance of related user information in the comment table in the database?

  scenario: users leave comments on certain works, etc. A single table in the database stores these messages, which contains information such as the user s profile picture and nickname. Scheme: user id, is used in the comment table to associate...

  Backend-development-of backend database mongodb mysql

  Mar.28,2021
• Url time query field description

  A need to find a user created within 05-01 05-24 and last logged in a time field greater than 05-11 a comparison type how to map to url I currently write http: localhost user?create_. creation time field is range creation time is > < how to elegantly ...

  Java-web web-backend backend-development-of backend node.js

  Mar.13,2021
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-64f5-1e4895d-44ccb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4895d-44ccb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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