First Value
Definition
The firstValue
method allows you to add the FIRST_VALUE
function to the query. The FIRST_VALUE
function returns a value evaluated against the first row in a sorted partition of a result set.
Available methods
firstValue(KColumn kColumn)
: Receives aKColumn
or aKTableColumn
which will be supplied to theFIRST_VALUE
function. .
To use this way, you need to import the static functions as follows:
import static com.myzlab.k.KFunction.*;
Example
Java code:
k
.select(
APP_USER.FIRST_NAME,
firstValue(APP_USER.FIRST_NAME).over(
wd().partitionBy(APP_USER.ROLE_ID)
)
)
.from(APP_USER)
.multiple();
SQL generated:
SELECT
au.first_name,
FIRST_VALUE(au.first_name) OVER(
PARTITION BY au.role_id
)
FROM app_user au
Parameters:
- None