GroupField (jOOQ 3.13.6 API)

All Superinterfaces:

QueryPart, Serializable

All Known Subinterfaces:

AggregateFilterStep<T>, AggregateFunction<T>, ArrayAggOrderByStep<T>, CaseConditionStep<T>, CaseWhenStep<V,T>, Field<T>, GroupConcatOrderByStep, GroupConcatSeparatorStep, Param<T>, TableField<R,T>, UDTField<R,T>, Variable<T>, WindowBeforeOverStep<T>, WindowExcludeStep<T>, WindowFinalStep<T>, WindowOrderByStep<T>, WindowPartitionByStep<T>, WindowRowsStep<T>

All Known Implementing Classes:

ConvertDateTime, CustomField
```
public interface GroupField
extends QueryPart
```
An expression to be used exclusively in GROUP BY clauses.
The SELECT .. GROUP BY clause accepts a variety of expressions, mostly ordinary Field expressions, but also some special expressions usable only in the GROUP BY clause, such as DSL.groupingSets(Field[][]).
Example:
```
 // Assuming import static org.jooq.impl.DSL.*;

 using(configuration)
    .select(ACTOR.LAST_NAME)
    .from(ACTOR)
    .groupBy(ACTOR.LAST_NAME) // GroupField reference here
    .fetch();
 
```
Instances can be created using DSL.groupingSets(Field[][]) and related methods, or by creating a subtype.
Author:

Lukas Eder

- Method Summary
  - Methods inherited from interface org.jooq.QueryPart
    equals, hashCode, toString