Thursday, November 18, 2010

SQL FIRST() Function

SQL FIRST() Function

The FIRST() Function

The FIRST() function returns the first value of the selected column.

SQL FIRST() Syntax

SELECT FIRST(column_name) FROM table_name


SQL FIRST() Example

We have the following "Orders" table:
O_Id
OrderDate
OrderPrice
Customer
1
2008/11/12
1000
Hansen
2
2008/10/23
1600
Nilsen
3
2008/09/02
700
Hansen
4
2008/09/03
300
Hansen
5
2008/08/30
2000
Jensen
6
2008/10/04
100
Nilsen


Now we want to find the first value of the "OrderPrice" column.


We use the following SQL statement:


SELECT FIRST(OrderPrice) AS FirstOrderPrice FROM Orders


Tip: Workaround if FIRST() function is not supported:


SELECT OrderPrice FROM Orders ORDER BY O_Id LIMIT 1


The result-set will look like this:


FirstOrderPrice
1000

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