Question

如何翻译此SQL查询：

SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name
HAVING aggregate_function(column_name) operator value

到Acumatica BQL？

Answer 1

我相信Bql还没有可用的功能。

我解决这个问题的方法是使用投影来生成子查询。例如：

[Serializable]
[PXProjection(typeof(
    Select4<Table,
        Aggregate<
            GroupBy<Table.column1,
            Sum<Table.column2>>>>))]
public class AggregateTable : IBqlTable
{
    // This will contain aggregate value - GroupBy
    public abstract class column1: PX.Data.IBqlField
    {
    }

    [PXDBString(BqlField = typeof(Table.column1))]
    [PXUIField(DisplayName = "Column1")]
    public virtual string Column1 { get; set; }

    // This will contain aggregate value - Sum
    public abstract class column2: PX.Data.IBqlField
    {
    }

    [PXDBInt(BqlField = typeof(Table.column2))]
    [PXUIField(DisplayName = "Column2")]
    public virtual int? Column2 { get; set; }
}

然后您可以使用正常的选择过滤聚合：

public PXSelect<AggregateTable, Where<AggregateTable.column2, Equal<Required<AggregateTable.column2>>>> FilteredTable;

var rows = FilteredTable.Select(10);

我试着非常谨慎地使用它，因为如果你不小心它可能会变得混乱。

Answer 2

在FBQL中出现了Haveing。下面是实现了以下内容的AggregateTo <>和OrderBy <>部分的示例：

.AggregateTo<Sum<field1>, GroupBy<field2>, Max<field3>,
     Min<field4>, Avg<field5>, Count<field6>>.
     Having<field5.Averaged.IsGreater<Zero>>
    .OrderBy<field1.Asc, field2.Desc, field3.Asc>

BQL集团在Acumatica

2 个答案: