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25 sty 2024 · This tutorial will guide you through the use of aliases in MySQL 8 for both columns and tables in SELECT statements. By using aliases, you can write more concise and readable SQL statements, simplifying complex queries and reducing effort in both writing and understanding SQL code.
Aliases are used to give a table, or a column in a table, a temporary name. Aliases are often used to make column names more readable. An alias only exists for the duration of that query. An alias is created with the AS keyword. In this tutorial we will use the well-known Northwind sample database. Below is a selection from the "Customers" table:
Aliases can only be referenced again at certain points (particularly in GROUP BY and HAVING clauses). But you can't reuse an alias in the SELECT clause. So you can use a derived query (such as suggested by Rubens Farias) which lets you basically rename your columns and/or name any computed columns.
This tutorial shows you how to use MySQL aliases to assign temporary names to columns or tables in a query.
A select_expr can be given an alias using AS alias_name. The alias is used as the expression's column name and can be used in GROUP BY, ORDER BY, or HAVING clauses. For example: SELECT CONCAT(last_name,', ',first_name) AS full_name FROM mytable ORDER BY full_name;
28 cze 2024 · SELECT column_name AS alias_name FROM table_name; Here, column_name is the column in a table, alias_name is a temporary alias name to be used in replacement of the original column name, and table_name is a table name.
4 wrz 2024 · The basic syntax for assigning an alias is giving the column or table name, followed by AS, followed by the desired alias. SELECT column_name AS alias_name FROM table_name; SELECT column_name FROM table_name AS alias_name; Column Aliases. Column aliases are used to rename the column in an output from a MySQL query. This is helpful when column ...
