SQL tutorial. Correction suggestion

[Yevheniy]

https://www.w3schools.com/sql/sql_distinct.asp

The following line: "The following SQL statement selects all (and duplicate) values from the "Country" column in the "Customers"" would be better understood if put this way:

"The following SQL statement selects all (including the duplicates) values from the "Country" column in the "Customers" 

The suggested correction is underlined.

[Funce]

Try using the 'Report Error' button at the bottom of the page you've linked. Include what you've said here.

That will alert the developers to your correction.

[Rani Agrawal]

when trying to run below mention query in SQL editor provided by W3 schools, a query is not giving expected results under "SQL Aliases" section

Please copy paste the SQL query

SELECT CustomerName, Address + ', ' + PostalCode + ' ' + City + ', ' + Country AS Address
FROM Customers;

[Ingolme]

I'd have to check the references again, but I don't think that SQL has a concatenation operator, "+" is for addition. MySQL uses the CONCAT() function to concatenate strings.