MySQL: @variable vs. variable. What's the difference?

MySQL: @variable vs. variable. What's the difference?

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How do you use script variables in psql?

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How to declare variable and use it in the same Oracle SQL script?

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How do I declare and assign a variable on a single line in SQL

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How do I use variables in Oracle SQL Developer?

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SQL NVARCHAR and VARCHAR Limits

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How to return the output of stored procedure into a variable in sql server

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How to include a PHP variable inside a MySQL statement

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How to use a tablename variable for a java prepared statement insert [duplicate]

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Use a variable within heredoc in PHP (SQL practice)

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Suppress output of variables substitution in sqlplus

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In MySQL is there a variable for the current database?

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Assigning a variable inside an IF EXISTS clause

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Setting a variable date in SQL

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Declaring & Setting Variables in a Select Statement

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