SQL LAST() 函数
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;
ORDER BY column_name DESC;
实例
SELECT TOP 1 name FROM Websites
ORDER BY id DESC;
ORDER BY id DESC;
MySQL 语法
SELECT
column_name
FROM
table_name
ORDER BY column_name DESC
LIMIT 1;
ORDER BY column_name DESC
LIMIT 1;
实例
SELECT name FROM Websites
ORDER BY id DESC
LIMIT 1;
ORDER BY id DESC
LIMIT 1;
Oracle 语法
SELECT
column_name
FROM
table_name
ORDER BY column_name DESC
WHERE ROWNUM <=1;
ORDER BY column_name DESC
WHERE ROWNUM <=1;
实例
SELECT name FROM Websites
ORDER BY id DESC
WHERE ROWNUM <=1;
ORDER BY id DESC
WHERE ROWNUM <=1;
演示数据库
在本教程中,我们将使用 yssmx 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 _云搜索MX教程 _/ _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;
ORDER BY id DESC
LIMIT 1;
执行以上 SQL 结果如下所示: