Entity Framework Query - Unable to fetch data

Question

I am working on a WPF application and using Entity framework 6.0
I have written following query to fetch data from database but could not fetch any data:
var customersList = context.Customers.Include(x => x.ReturnedCustomerItems.Select(y => y.ReturnedLotItem)).Where(x => x.IsDeleted != false).ToList();
Notes:
1. context: Database Context Object
2. Customers: DbSet for Customer's table
3. ReturnedCustomerItems: List of Customer Items to be returned.
4. ReturnedLotItem: Lot Item corresponding to Returned Customer Item. Each Customer Item will have a corresponding lot item..
Following is the SQL Query I have written to check whether data exits inside database:
select * from
transportapp.dbo.customer cust,
transportapp.dbo.ReturnedCustomerItem ret,
transportapp.dbo.ReturnedLotItem item
where
cust.CustomerId = ret.CustomerId
and ret.BookingItemId = item.BookingItemId
As output I got the following data records:
Following is the Table structure generated by Entity Framework:
CREATE TABLE [dbo].[ReturnedCustomerItem] (
[BookingItemId] INT NOT NULL,
[IsDeleted] BIT NOT NULL,
[CustomerId] INT NOT NULL,
[ReturnCharge] DECIMAL (18, 2) NOT NULL,
[DemurrageCharge] DECIMAL (18, 2) NOT NULL,
[Weight] DECIMAL (18, 2) NOT NULL,
[Quantity] INT NOT NULL,
[ReturnDate] DATETIME NOT NULL,
[Status] NVARCHAR (100) NULL,
CONSTRAINT [PK_dbo.ReturnedCustomerItem] PRIMARY KEY CLUSTERED ([BookingItemId] ASC),
CONSTRAINT [FK_dbo.ReturnedCustomerItem_dbo.Customer_CustomerId] FOREIGN KEY ([CustomerId]) REFERENCES [dbo].[Customer] ([CustomerId]) ON DELETE CASCADE,
CONSTRAINT [FK_dbo.ReturnedCustomerItem_dbo.ReturnedLotItem_BookingItemId] FOREIGN KEY ([BookingItemId]) REFERENCES [dbo].[ReturnedLotItem] ([BookingItemId])
CREATE TABLE [dbo].[ReturnedLotItem] (
[BookingItemId] INT NOT NULL,
[IsDeleted] BIT NOT NULL,
[IsReturned] BIT NOT NULL,
[ReturnCharge] DECIMAL (18, 2) NOT NULL,
[DemurrageCharge] DECIMAL (18, 2) NOT NULL,
[Weight] DECIMAL (18, 2) NOT NULL,
[Quantity] INT NOT NULL,
[LotId] INT NOT NULL,
[LotItemId] INT NOT NULL,
CONSTRAINT [PK_dbo.ReturnedLotItem] PRIMARY KEY CLUSTERED ([BookingItemId] ASC),
CONSTRAINT [FK_dbo.ReturnedLotItem_dbo.BookingItem_BookingItemId] FOREIGN KEY ([BookingItemId]) REFERENCES [dbo].[BookingItem] ([BookingItemId]),
CONSTRAINT [FK_dbo.ReturnedLotItem_dbo.ReturnedLot_LotId] FOREIGN KEY ([LotId]) REFERENCES [dbo].[ReturnedLot] ([LotId]) ON DELETE CASCADE,
CONSTRAINT [FK_dbo.ReturnedLotItem_dbo.LotItem_LotItemId] FOREIGN KEY ([LotItemId]) REFERENCES [dbo].[LotItem] ([BookingItemId]) ON DELETE CASCADE
I am unable to debug the LINQ expression where I am going wrong. Need help in identifying the mistake.
Thanks!!
NB

Answer 1

The best way of debugging the SQL is to change the where portion
1) First eliminate the 'where'
2) Run with only one where statement  : cust.CustomerId
= ret.CustomerId
3) Run with the other where : ret.BookingItemId
= item.BookingItemId
Then compare the 3 results.  Your database may not contain any data that has both where statements true.
jdweng