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Alias - (MySQL Misc)

In MySQL, an alias is a temporary name assigned to a table or a column in a query. Aliases are useful for making queries more readable and for minimizing the amount of typing required. In this tutorial, we will discuss aliases in MySQL.

Syntax

The syntax for creating an alias in MySQL is as follows:

SELECT column_name AS alias_name
FROM table_name;

In the above syntax, "column_name" is the name of the column that you want to alias, and "alias_name" is the temporary name that you want to assign to the column.

You can also use aliases for table names, like this:

SELECT column_name
FROM table_name AS alias_name;

In this syntax, "table_name" is the name of the table you want to query, and "alias_name" is a temporary name assigned to the table.

Example

Let's say we have a table "employees" with columns "id", "first_name", and "last_name". We can use aliases to make our query more readable. Here's an example:

SELECT id, CONCAT(first_name, ' ', last_name) AS full_name
FROM employees;

In the above example, we are combining the "first_name" and "last_name" columns to create a new column called "full_name". We use the CONCAT function to concatenate the two columns, and we assign the temporary name "full_name" to this new column using an alias.

Output

When we run the example query above, we'll get a result set with two columns ("id" and "full_name"):

id | full_name
---|----------------
1  | John Smith
2  | Jane Doe
3  | Bob Johnson

Explanation

In the example above, we used an alias to give a temporary name "full_name" to the concatenated value of "first_name" and "last_name". This alias made our query more readable and the output more useful.

Use

Aliases can be used to make queries more readable, to rename columns or tables temporarily, to shorten the amount of typing required, and to make queries more efficient in some cases.

Important Points

  • Aliases are temporary names assigned to columns or tables in a query.
  • Aliases can make queries more readable and efficient.
  • You can use the "AS" keyword to assign an alias in MySQL.

Summary

In this tutorial, we discussed aliases in MySQL. We covered the syntax, example, output, explanation, use, and important points of aliases in MySQL. With this knowledge, you can now use aliases to rename columns or tables temporarily and make your MySQL queries more readable and efficient.

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