SQL LAST() 函数

---

　LAST() 函数返回指定的列中最后一个记录的值。

SQL LAST() 语法

SELECT LAST(column_name) FROM table_name;    

注释：只有 MS Access 支持 LAST() 函数。

SQL Server、MySQL 和 Oracle 中的 SQL LAST() 工作区

---

SQL Server 语法

SELECT TOP 1 column_name
FROM table_name
ORDER BY column_name DESC;        

实例

SELECT TOP 1 CustomerName FROM Customers               
ORDER BY CustomerID DESC;        

MySQL 语法

SELECT column_name FROM table_name                
ORDER BY column_name DESC                
LIMIT 1;        

实例

SELECT CustomerName FROM Customers                
ORDER BY CustomerID DESC                
LIMIT 1;     

Oracle 语法

SELECT column_name FROM table_name               
ORDER BY column_name DESC                
WHERE ROWNUM <=1;       

实例

SELECT CustomerName FROM Customers                
ORDER BY CustomerID DESC                
WHERE ROWNUM <=1;       

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 LAST() Example

---

　下面的 SQL 语句选取 "Customers" 表的 "CustomerName" 列中最后一个记录的值：