Can anyone share the advanced experience of sql sentences?

is there any way?
such as recommended books, blogs, etc.

Sqlserver oracle mysql sql

Mar.11,2021

personal advice can go to the Internet to watch videos directly, many of which are free about databases. Better learning websites are: Mutu.com, Tencent classroom, NetEase Cloud classroom and so on.
take mysql database as an example. I learned it in Tencent class. It feels good. I'll give you a link https://ke.qq.com/course/280048

it is not recommended to learn through blog

go through the basics systematically:
SQL tutorial
MySQL tutorial

check the corresponding official documents
mysql
sqlserver

when using.

blog is only used as a place to query solutions to difficulties

first learn the basics of mysql and understand the basic sql writing syntax
Advanced can read the book "High performance mysql"

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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-64f5-1c25d89-33794.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1c25d89-33794.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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