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You'll need to use a subselect to use that aliases that way. SELECT my_num*5 AS another_number FROM ( SELECT 10 AS my_num FROM table ) x
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.
1 lut 2017 · It works for DATE, TIMESTAMP, DATETIME, and even the microsecond-included DATETIME(6). It takes care of leap days, end of year, etc. It is index-friendly (so is BETWEEN ).
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:
27 sty 2024 · Working with databases often requires a firm handle on querying techniques, especially when it comes to finding records within a specific date range. In this guide, you’ll learn how to use MySQL to select rows that fall between two dates or times—a common task for any data professional.
A table reference can be aliased using tbl_name AS alias_name or tbl_name alias_name. These statements are equivalent: SELECT t1.name, t2.salary FROM employee AS t1, info AS t2 WHERE t1.name = t2.name; SELECT t1.name, t2.salary FROM employee t1, info t2 WHERE t1.name = t2.name;
Summary: in this tutorial, you will learn how to use MySQL aliases to assign temporary names to columns or tables in a query. MySQL supports two kinds of aliases: column aliases and table aliases. In MySQL, you use column aliases to assign a temporary name to a column in the query’s result set.
