How do I create a variable in MySQL?

1. Assigning value to a variable using SET command. mysql>SET @var1 = 2+6; mysql>SET @var2 := @var1-2;
2. Accessing a undeclared variable mysql>SELECT @var3; Output: +——-+ | @var3 | +——-+ | NULL | +——-+
3. Assigning value to a variable without using SET.

How do you store a variable in a query?

To store query result in one or more variables, you use the SELECT INTO variable syntax:

1. SELECT c1, c2, c3.
2. SELECT city INTO @city FROM customers WHERE customerNumber = 103;
3. SELECT @city;
4. SELECT city, country INTO @city, @country FROM customers WHERE customerNumber = 103;
5. SELECT @city, @country;

How do I add a variable to a table in MySQL?

set @variable= @variable1+@variable2 INSERT INTO table (column) VALUES(@variable); INSERT INTO table (column) VALUES(‘variable’);

How do I display a variable in MySQL?

SHOW VARIABLES accepts an optional GLOBAL or SESSION variable scope modifier: With a GLOBAL modifier, the statement displays global system variable values. These are the values used to initialize the corresponding session variables for new connections to MySQL. If a variable has no global value, no value is displayed.

How do I save a query in MySQL?

The statements entered can be saved to a file or snippet for later use. At any point, you can also execute the statements you have entered. To save a snippet of code entered into the query editor, click Save SQL to Snippets List ( ) from the SQL query toolbar, enter a name (optional), and click OK.

How do I print a variable value in MySQL?

For debugging info from stored procedure in MySQL,there are following options through which you can do this.

1. Write into the file externally:
2. Use select command to print message:
3. Use select command to print additional information with message:
4. Create addition table temp and push all message into it:

How do I permanently set a global variable in MySQL?

To persist a global system variable to the mysqld-auto. cnf option file in the data directory, precede the variable name by the PERSIST keyword or the @@PERSIST. qualifier: SET PERSIST max_connections = 1000; SET @@PERSIST.