org.jooq

Interface OrderedAggregateFunction<T>

public interface OrderedAggregateFunction<T>

An ordered-set aggregate function.

An ordered-set aggregate function is an aggregate function with a mandatory Oracle-specific WITHIN GROUP (ORDER BY ..) clause. An example is LISTAGG:

 SELECT   LISTAGG(TITLE, ', ')
          WITHIN GROUP (ORDER BY TITLE)
 FROM     T_BOOK
 GROUP BY AUTHOR_ID
 

The above function groups books by author and aggregates titles into a concatenated string.

Ordered-set aggregate functions can be further converted into window functions using the OVER(PARTITION BY ..) clause. For example:

 SELECT LISTAGG(TITLE, ', ')
        WITHIN GROUP (ORDER BY TITLE)
        OVER (PARTITION BY AUTHOR_ID)
 FROM   T_BOOK
 

Author:

Lukas Eder

Method Summary

Modifier and Type	Method and Description
AggregateFilterStep<T>	withinGroupOrderBy(java.util.Collection<? extends OrderField<?>> fields) Add an WITHIN GROUP (ORDER BY ..)
AggregateFilterStep<T>	withinGroupOrderBy(OrderField<?>... fields) Add an WITHIN GROUP (ORDER BY ..)

Method Detail

withinGroupOrderBy

@Support(value={CUBRID,DB2,H2,HSQLDB,MARIADB,MYSQL,ORACLE11G,ORACLE12C,POSTGRES,REDSHIFT,SYBASE})
AggregateFilterStep<T> withinGroupOrderBy(OrderField<?>... fields)

Add an WITHIN GROUP (ORDER BY ..) clause to the ordered aggregate function

withinGroupOrderBy

@Support(value={CUBRID,DB2,H2,HSQLDB,MARIADB,MYSQL,ORACLE11G,ORACLE12C,POSTGRES,REDSHIFT,SYBASE})
AggregateFilterStep<T> withinGroupOrderBy(java.util.Collection<? extends OrderField<?>> fields)

Add an WITHIN GROUP (ORDER BY ..) clause to the ordered aggregate function