SQL FIRST()

SQLFIRST() 函数


FIRST() 函数

FIRST() 函数返回指定的列中第一个记录的值。

SQL FIRST() 语法

SELECT FIRST(column_name) FROM table_name;

注释:只有 MS Access 支持 FIRST() 函数。


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

SQL Server 语法

SELECT TOP 1 column_name FROM table_name
ORDER BY column_name ASC;

实例

SELECT TOP 1 CustomerName FROM Customers
ORDER BY CustomerID ASC;

MySQL 语法

SELECT column_name FROM table_name
ORDER BY column_name ASC
LIMIT 1;

实例

SELECT CustomerName FROM Customers
ORDER BY CustomerID ASC
LIMIT 1;

Oracle 语法

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

实例

SELECT CustomerName FROM Customers
ORDER BY CustomerID ASC
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 snabbk?p Christina Berglund Berguvsv?gen 8 Lule? S-958 22 Sweden


SQL FIRST() 实例

下面的 SQL 语句选取 "Customers" 表的 "CustomerName" 列中第一个记录的值:

实例

SELECT FIRST(CustomerName) AS FirstCustomer FROM Customers;
© 2021 jiaocheng.bubufx.com  联系我们
ICP备案:鲁ICP备09046678号-3