mysql Alias ​​operator

UK[ˈeɪliəs] US[ˈeliəs, ˈeljəs]

n.Alias, pseudonym

adv.A pseudonym; known by a pseudonym; an alias; an alias also known by Called

plural: aliases

mysql Alias ​​operator syntax

Function:Specify aliases for column names and table names

Syntax: SELECT column_name(s) FROM table_name AS alias_name

mysql Alias ​​operator example

//假设我们有两个表分别是："Persons" 和 "Product_Orders"。我们分别为它们指定别名 "p" 和 "po"。列出 "John Adams" 的所有定单
SELECT po.OrderID, p.LastName, p.FirstName FROM Persons AS p, Product_Orders AS po WHERE p.LastName='Adams' AND p.FirstName='John';