SQL LCASE() 函数

LCASE() 函数

LCASE() 函数把字段的值转换为小写。

 SELECT LCASE(column_name) FROM table_name;

 SELECT LOWER(column_name) FROM table_name;

在本教程中，我们将使用众所周知的 Northwind 样本数据库。

下面是选自 "Customers" 表的数据：

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Maria Anders	Obere Str. 57	Berlin	12209	Germany
2	Ana Trujillo Emparedados y helados	Ana Trujillo	Avda. de la Constitución 2222	México D.F.	05021	Mexico
3	Antonio Moreno Taquería	Antonio Moreno	Mataderos 2312	México D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbköp	Christina Berglund	Berguvsvägen 8	Luleå	S-958 22	Sweden

下面的 SQL 语句从 "Customers" 表中选取 "CustomerName" 和 "City" 列，并把 "CustomerName" 列的值转换为小写：

 SELECT LCASE(CustomerName) AS Customer, City
FROM Customers;