使用JPA和Hibernate与GROUP BY查询一起使用ORDER BY

Question

I'm trying to make a query using order by and group by at the same time But I'm taking a following error:

ORA-00979: not a GROUP BY expression

Here is query's code:

  @Query("select distinct p from PointSpreadsheets p left join fetch p.shlSpreadsheetRegistersList srl" +
        "  WHERE (:BUAPP is null OR srl.buApprobation = :BUAPP)" +
        " AND (:STATUS is null OR p.idStatus = :STATUS)" +
        " AND (:CCAPP is null OR srl.ccApprobation = :CCAPP)" +
        " AND (:EMPLOYEE is null OR p.idEmployee = :EMPLOYEE)" +
        " AND (:CCLIST is null or srl.idCostCenter  = :CCLIST)" +
        " AND (p.idEmployee.idBusinessUnit IN (:BU))" +
        " AND (p.referencePeriod.idReferencePeriod IN :PERIODS)"
        + " GROUP BY"
        + " p.buApprobation, p.ccApprobation, p.dateBuApprobation,"
        + " p.dateCcApprobation, p.finalDate, p.idEmployee, p.idPeriodicity,"
        + " p.idSpreadsheet, p.idStatus, p.initialDate, p.referencePeriod"
        + " ORDER BY p.idEmployee")    
public List<PointSpreadsheets> PointSpreadsheetFilter(
        @Param("STATUS") BigDecimal status,
        @Param("BUAPP") BigDecimal buApprobation,
        @Param("CCAPP") BigDecimal ccApprobation,
        @Param("PERIODS") List<BigDecimal> periods,
        @Param("EMPLOYEE") Employees employee,
        @Param("BU") List<BusinessUnits> businessUnits,
        @Param("CCLIST") CostCenter cc);

Answer 1

Since there is no aggregate function, like COUNT or something else, the GROUP BY doesn't really mean anything to the database. The poor Database is wondering "group what ?" and throws a tantrum. You can certainly have ORDER BY and GROUP BY in the same SQL statement.