How to join same table twice using PXSelectJoinOrderBy - sql

Question

I am trying to create view using PXSelectJoinOrderBy for the following SQL statement
SELECT * FROM INVENTORYITEM II
LEFT JOIN INItemXRef X1 ON II.InventoryID = X1.InventoryID AND
X1.AlternateType = '0VPN' LEFT JOIN INItemXRef X2 ON II.InventoryID = X1.InventoryID AND
X2.AlternateType = '0CPN'
I have used the following statement to join INItemXRef table once and it is working fine.
public PXSelectJoinOrderBy<InventoryItem, LeftJoin<INItemXRef, On<INItemXRef.inventoryID, Equal<InventoryItem.inventoryID>>>, OrderBy<Asc<InventoryItem.inventoryCD>>> FilteredItems;
How to join INItemXRef again with different alias?

Answer 1

You can obtain the result you want by creating 2 class that inherit the class INItemXRef and using them in the bql query.
public PXSelectJoinOrderBy<InventoryItem,
LeftJoin<VendorINItemXRef,
On<InventoryItem.inventoryID,
Equal<VendorINItemXRef.inventoryID>,
And<VendorINItemXRef.alternateType,
Equal<string_0VPN>>>,
LeftJoin<CustomerINItemXRef,
On<InventoryItem.inventoryID,
Equal<CustomerINItemXRef.inventoryID>,
And<CustomerINItemXRef.alternateType,
Equal<string_0CPN>>>>>,
OrderBy<Asc<InventoryItem.inventoryCD>>> FilteredItems;
public class VendorINItemXRef : INItemXRef
{
public new class inventoryID : IBqlField{}
public new class alternateType : IBqlField{}
}
public class CustomerINItemXRef : INItemXRef
{
public new class inventoryID : IBqlField { }
public new class alternateType : IBqlField { }
}
You also need to override the parameters that will be used for the comparison so the system can bound them.
For additional information you can also check this question :
Acumatica BQL Query with the same table more than once.