SQL LCASE() 函数


 LCASE() 函数把字段的值转换为小写。

SQL LCASE() 语法

SELECT LCASE(column_name) FROM table_name;     

用于 SQL Server 的语法

SELECT LOWER(column_name) FROM table_name;     

演示数据库


 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

SQL LCASE() 实例


 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:

实例

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