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;
FROM Customers;