SQL LCASE() 函數(shù)

　LCASE() 函數(shù)把字段的值轉(zhuǎn)換為小寫。

SQL LCASE() 語法

SELECT LCASE(column_name) FROM table_name;

用于 SQL Server 的語法

SELECT LOWER(column_name) FROM table_name;

演示數(shù)據(jù)庫

　在本教程中，我們將使用眾所周知的 Northwind 樣本數(shù)據(jù)庫。

　下面是選自 "Customers" 表的數(shù)據(jù)：

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 snabbk?p Christina Berglund Berguvsv?gen 8 Lule? S-958 22 Sweden

SQL LCASE() 實(shí)例

　下面的 SQL 語句從 "Customers" 表中選取 "CustomerName" 和 "City" 列，并把 "CustomerName" 列的值轉(zhuǎn)換為小寫：

實(shí)例

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