What's the difference between @ and @ @ in MySQL?

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The difference between @ and @ @ in MySQL

@ x is a user-defined variable (User variables are written as @ var_name)

@ x is a global or session variable (@ @ global @ @ session)

Reference: 6.1.4 Server System Variables

Select @ @ log_error

Mysql > SET @ t1room0, @ t2room0, @ t3room0

Mysql > SELECT @ t1vision = (@ t2rang1) + @ t3purl 4jcgi t1jue t2jingt3

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