最新的Web開發教程
 

SQL LEN() Function


LEN()函數

LEN()函數返回文本字段中值的長度。

SQL LEN()語法

SELECT LEN(column_name) FROM table_name;

演示數據庫

在本教程中,我們將使用眾所周知的Northwind示例數據庫。

下面是從選擇"Customers"表:

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 Constitucion 2222 Mexico D.F. 05021 Mexico
3 Antonio Moreno Taqueria Antonio Moreno Mataderos 2312 Mexico D.F. 05023 Mexico
4

Around the Horn Thomas Hardy 120 Hanover Sq. London WA1 1DP UK
5 Berglunds snabbkop Christina Berglund Berguvsvagen 8 Lulea S-958 22 Sweden

SQL LEN()示例

下面的SQL語句選擇"CustomerName"和值的長度"Address"欄從"Customers"表:

SELECT CustomerName,LEN(Address) as LengthOfAddress
FROM Customers;
試一試»