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WINDOW_FUNCTION_FIRST_VALUE

WINDOW FUNCTION FIRST_VALUE​

description​

FIRST_VALUE() returns the first value in the window's range.

FIRST_VALUE(expr) OVER(partition_by_clause order_by_clause [window_clause])

example​

We have the following data

 select name, country, greeting from mail_merge;

| name | country | greeting |
|---------|---------|--------------|
| Pete | USA | Hello |
| John | USA | Hi |
| Boris | Germany | Guten tag |
| Michael | Germany | Guten morgen |
| Bjorn | Sweden | Hej |
| Mats | Sweden | Tja |

Use FIRST_VALUE() to group by country and return the value of the first greeting in each group:

select country, name,    
first_value(greeting)
over (partition by country order by name, greeting) as greeting from mail_merge;

| country | name | greeting |
|---------|---------|-----------|
| Germany | Boris | Guten tag |
| Germany | Michael | Guten tag |
| Sweden | Bjorn | Hej |
| Sweden | Mats | Hej |
| USA | John | Hi |
| USA | Pete | Hi |

keywords​

WINDOW,FUNCTION,FIRST_VALUE