The regular SQL is null update query may fail while updating Access database. Access DB has some different is null checking system. Put the Is Null statement at the end of the where section may fix the problem.
Here is the query
UPDATE Sales SET Sales.Taxable = 0
WHERE Sales.Taxable Is Null
Wanna migrating Access database to MS SQL Server? You have two options; programmatically deal the transaction with the new database or use Microsoft SQL Server Migration Assistant for Access and migrate the database directly to a newly created database to SQL Server 2005 or later versions
Before starting with MSSQLMA Note the following
- Prepare your database
- Check your Access database version, whether it is 32 or 64 database. If it is 32 make sure that you run 32 version of MSSQLMA which can be found under Microsoft SQL Server Migration Assistant for Access folder.
- There are different versions of MSSQLMA available for different versions of the Access database.
Download Migration Assistant for Windows
Use the following link to download the free Migration Assistant from Microsoft official website.
v5.3 , v6.0 , v7.8
Use Migration Wizard to add database and convert, load and migrate functions to finish the process.
Sometimes you may need to convert your access database to 97/2000 format for easy migration otherwise it will end up with a bunch of errors.
Run appropriate versions of Migration Assistant
DAO is one of many ways to access database in VB6. This tutorial tells you how you can access a .mdb database which is not pointed by the DAO Database object.
I have separate Access 2003 .mdb database files, one is pointed by the Database object conn and the other I want to access using the same connection.
SELECT * FROM [File Path][DBNAME].[TABLE]
Have a look at the connection. [May be you already know, what its look like, this for those not familiar with DAO in VB6]
Dim externalEmp As Recordset
Dim conn As Database
Set conn = OpenDatabase("D:\105443T.mdb")
The conn is now capable of querying any table within the 105443T database.
Set tr = conn.OpenRecordset("select * from Transactions")
If tr.RecordCount > 0 Then
For c = 0 To tr.RecordCount - 1
Debug.Print tr!date & "--" & tr!dr & "--" & tr!cr
Querying the external DB
Likewise, I can point external Database too with zero changes in conn object. Just specify the [path of file] [.] [data table Name] in place of the table name in the query.
Set externalEmp = conn.OpenRecordset("select * from C:\users\manoj\documents\office.emp")
If externalEmp.RecordCount > 0 Then
For c = 0 To externalEmp.RecordCount - 1
Debug.Print externalEmp!Ename & "--" & externalEmp!edepart & "--" & externalEmp!ebasic
The same is also possible with ADO and other connections.
In access database, we can copy rows from one table to another using query. How can we transfer rows from one database to another?
Using the in keyword in Insert statement we can specify an external database path as follows in a access query
insert into Account_Transactions(Date ,Name ,Type ) in ‘D:\Sherpharma\T.mdb’ select Account_Transactions.Date,Account_Transactions.Name,Account_Transactions.Type from Account_Transactions
Here we copy the rows from current database to the T.mdb files. We can also use this query in programming as well.
How to List all data tables from a access .accdb file in VB.net using the ‘GetSchema’ Method. This tutorial is quick access to the problem.
How to add all column names into a listview Column header in VB.Net, here is my complete tutorial for you