SQL LAST() 函數
LAST() 函數
LAST() 函數返回指定的列中最後一個記錄的值。
SQL LAST() 語法
SELECT LAST(column_name) FROM table_name;
註釋:只有MS Access支持LAST()函數。
SQL Server、MySQL 和Oracle 中的SQL LAST() 工作區
SQL Server 語法
SELECT TOP 1 column_name
FROM table_name
ORDER BY column_name DESC;
ORDER BY column_name DESC;
實例
SELECT TOP 1 name FROM Websites
ORDER BY id DESC;
ORDER BY id DESC;
MySQL 語法
SELECT column_name FROM table_name
ORDER BY column_name DESC
LIMIT 1;
ORDER BY column_name DESC
LIMIT 1;
實例
SELECT name FROM Websites
ORDER BY id DESC
LIMIT 1;
ORDER BY id DESC
LIMIT 1;
Oracle 語法
SELECT column_name FROM table_name
ORDER BY column_name DESC
WHERE ROWNUM <=1;
ORDER BY column_name DESC
WHERE ROWNUM <=1;
實例
SELECT name FROM Websites
ORDER BY id DESC
WHERE ROWNUM <=1;
ORDER BY id DESC
WHERE ROWNUM <=1;
演示數據庫
在本教程中,我們將使用w3big 樣本數據庫。
下面是選自"Websites" 表的數據:
+----+--------------+---------------------------+-------+---------+ | id | name | url | alexa | country | +----+--------------+---------------------------+-------+---------+ | 1 | Google | https://www.google.cm/ | 1 | USA | | 2 | 淘宝 | https://www.taobao.com/ | 13 | CN | | 3 | 本教程 | http://www.w3big.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 | +----+---------------+---------------------------+-------+---------+
SQL LAST() 實例
下面的SQL 語句選取"Websites" 表的"name" 列中最後一個記錄的值:
實例
SELECT name FROM Websites
ORDER BY id DESC
LIMIT 1;
ORDER BY id DESC
LIMIT 1;
執行以上SQL 結果如下所示: