SQL LAST()

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 name FROM Websites
ORDER BY id DESC;

MySQL 语法

SELECT column_name FROM table_name
ORDER BY column_name DESC
LIMIT 1;

实例

SELECT name FROM Websites
ORDER BY id DESC
LIMIT 1;

Oracle 语法

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

实例

SELECT name FROM Websites
ORDER BY id DESC
WHERE ROWNUM <=1;

演示数据库

在本教程中,我们将使用 web3.xin 样本数据库。

下面是选自 "Websites" 表的数据:

+----+--------------+---------------------------+-------+---------+
| id | name         | url                       | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1  | Google       | https://www.google.cm/    | 1     | USA     |
| 2  | 淘宝          | https://www.taobao.com/   | 13    | CN      |
| 3  | 芝麻教程      | http://www.web3.xin/    | 4689  | CN      |
| 4  | 微博          | http://weibo.com/         | 20    | CN      |
| 5  | Facebook     | https://www.facebook.com/ | 3     | USA     |
|  6 | 百度         | https://www.baidu.com/    |     4 | CN      |
|  7 | stackoverflow | http://stackoverflow.com/ |     0 | IND     |
+----+---------------+---------------------------+-------+---------+

SQL LAST() 实例

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

实例

SELECT name FROM Websites
ORDER BY id DESC
LIMIT 1; 
执行以上 SQL 结果如下所示:
mysql> select name from websites order by id desc limit 1;
+---------------+
| name          |
+---------------+
| stackoverflow |
+---------------+
1 row in set (0.00 sec)
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