MySQL Aliases

In MySQL, an alias is a temporary name assigned to a table or column in a query. Aliases can make queries more readable and can be used to rename tables or columns in a query without changing the underlying database schema.

To create an alias for a table, you can use the AS keyword followed by the alias name:

SELECT column_name(s)
FROM table_name AS alias_name
WHERE condition;

In this syntax, column_name(s) is the name of the column(s) you want to select, table_name is the name of the table, alias_name is the temporary name you want to assign to the table, and condition is the condition that the data must meet to be included in the results.

Here’s an example of how you could use an alias to rename a table in a query:

SELECT *
FROM customers AS c
WHERE c.country = 'USA';

In this example, the AS keyword is used to create an alias c for the customers table. The WHERE clause then filters the results to only include customers from the United States.

To create an alias for a column, you can use the same syntax, but place the alias after the column name:

SELECT column_name AS alias_name
FROM table_name
WHERE condition;

In this syntax, column_name is the name of the column you want to select, alias_name is the temporary name you want to assign to the column, and condition is the condition that the data must meet to be included in the results.

Here’s an example of how you could use an alias to rename a column in a query:

SELECT order_id, order_date AS date_ordered
FROM orders
WHERE customer_id = 123;

In this example, the AS keyword is used to create an alias date_ordered for the order_date column. The WHERE clause then filters the results to only include orders from a specific customer.

Note that aliases are only valid for the duration of the query and do not change the underlying database schema.

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