Querying multiple tables and displaying the outcome wtih SQL and Access - sql

Question

I need to display the customers that have purchased a product (based on a user search) in a list box. I have five different tables in Access which store different information and that relate to each other with IDs (using combox boxes in vb). I need to be able to search for a product, for example "White Bread", the program then should display the customer's full name and address as stored in the database.
Table: TransactionDetails
Fields: ID, stockID, custTransID
Table: CustomerTransaction
Fields: ID, custID, dateOfTransaction
Table: CustomerAccountDetails
Fields: ID, custFullName, custAddress, custLandline,
custMobile, custDOB, custCreditDetails
Table: StockDescription
Fields: ID, stockName, stockDesc, stockPrice
Table: SupplierDetails
Fields: ID, supplierName, supplier Address
I think I need to use INNER JOIN to query multiple tables at once but I am unsure of the syntax (I'm new to SQL). So far I have this:
Dim productSearch As String
productSearch = productSrchInput.Text
Dim databaseConnection As New OleDb.OleDbConnection
Dim counter As Integer
Dim array(10) As String
databaseConnection.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=assignment5database.accdb"
databaseConnection.Open()
Dim searchDatabase As OleDbCommand = New OleDbCommand("SELECT CustomerAccountDetails.custFullName, CustomerAccountDetails.custAddress " & _
"FROM CustomerAccountDetails " & _
"INNER JOIN StockDescription ON TransactionDetails.stockID = TransactionDetails.custTransID " & _
"WHERE StockDescription.stockName = '" & productSearch & "'", databaseConnection)
Dim searchResults As OleDbDataReader = searchDatabase.ExecuteReader
counter = 1
Do While searchResults.Read
srchResultsList.Items.Add(searchResults.Item(0))
counter += 1
Loop
databaseConnection.Close()

Answer 1

You are missing some of the joins that connect the customer to the stock details. Here is the SQL that Access will expect in order to pull the data based on your description. The parentheses may seem extraneous, if you are used to SQL server or MySQL, but Access will throw a fit if you leave them out.
SELECT CustomerAccountDetails.custFullName, CustomerAccountDetails.custAddress, StockDescription.stockName
FROM StockDescription
INNER JOIN ((CustomerAccountDetails
INNER JOIN CustomerTransaction ON CustomerAccountDetails.ID = CustomerTransaction.custID)
INNER JOIN TransactionDetails ON CustomerTransaction.ID = TransactionDetails.custTransID) ON StockDescription.ID = TransactionDetails.StockID
WHERE StockDescription.stockName="something"
As noted by Fionnuala, I will almost always build a query that has multiple joins in it using the Access query designer before putting it in code. I almost always leave out a set of parentheses or try to write the query in a structure that SQL Server would expect and get rejected by Access.

Answer 2

I think you could be able to use an inner join but perhaps a "union" may be more efficient.
http://www.w3schools.com/sql/sql_union.asp is good for improving sql knowledge, it helped me a lot.