LAST() 函数
发表于 2018-3-7 12:15:41 | 分类于 SQL |
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;
示例
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;
示例
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;
示例
SELECT name FROM Websites
ORDER BY id DESC
WHERE ROWNUM <=1;
示例
"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 | 菜鸟教程 | http://www.runoob.com/ | 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 |
+----+---------------+---------------------------+-------+---------+
选取 "Websites" 表的 "name" 列中最后一个记录的值:
SELECT name FROM Websites
ORDER BY id DESC
LIMIT 1;
输出结果:
mysql> SELECT name FROM Websites
-> ORDER BY id DESC
-> LIMIT 1;
+----------------+
| name |
+----------------+
| stackoverflow |
+----------------+