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SQL LCASE() 函数



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

下面是选自 "Customers" 客户表的数据:

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:

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

执行结果

Customer City
alfreds futterkiste Berlin
ana trujillo emparedados y helados México D.F.
antonio moreno taquería México D.F.
around the horn London
berglunds snabbköp Luleå