I need to use a pass through query using an ODBC connection, however I need to further refine the SQL using another tables within the same Access database.
How do I reference the Access table? Access keeps thinking I am looking for a table via the ODBC connection rather than the database itself.
First, you create a Linked Table in access, using the ODBC connection. Then, you just write a query against the Access database using whatever name you give your Linked Table, and the names of the access tables.
Be warned: if the linked table contains a large number of rows, Linked Tables can be very inefficient.
Related
We would like to transfer data from a MS Access database to SQLite. Unfortunately, SQlite does not support the whole range of functions provided by Access.
ALTER TABLE Move DROP CONSTRAINT MoveEnum
ALTER TABLE IG_MDB_VERSION DROP COLUMN POOLART
Can anyone give us a replacement in SQLite which realizes the above two SQL statements. Thanks in advance!
If you are now able to link to the sqlite database from Access, and you can edit data with the linked tables from Access?
Then to execute your above sqlLite commands from Access?
Simply create + use what are called pass-though queries from Access. This will allow you to send/execute any valid sqlite commands from Access - including your example(s) in your question.
However before you attempt to use pass-though queries, you want to ensure that you can create linked tables from Access, and those linked tables allow you to edit data (say by clicking on a linked table in Access to sqlite, and that editing etc. works just fine from Access.
I am using a SQL database and MS Access 2019 as the front end. The SQL database tables are linked to the Access db using an ODBC connection.
All my queries (they have multiple joined linked tables) run just fine, but as soon as I add a join to a table stored in the Access app (for example, a small table just for mapping values) the query will slow to a crawl. Doesn't matter if the joined fields are indexed or what type of join I'm using.
If anyone has seen this behaviour and found a solution I would much appreciate hearing it.
Joining tables from two separate databases requires the client app to retrieve both tables in their entirety in order to determine the rows needed. That's why it's slow.
If your Access table is small, try using a stored procedure on the SQL side with the data from Access moved to a temporary table. (Or better yet, move the Access table to SQL).
I am very new to SQL, MS Access & PostgreSQL. So this might be a very silly question but somehow I can't figure it out. I'm trying to run SQL queries in access and my data is in a PostgreSQL database table which was linked to access by my colleague earlier. When I make this simple query why do I get an error that the table doesn't exist? Is the syntax different for linked database tables? Or is the link not yet established?
You have created a Pass-Through query. This query is executed on the server, not in Access, so you need to use the original table names from the PostgreSQL database.
So it's not FROM public_tb_change but FROM tb_change.
Or maybe FROM public.tb_change, if public isn't the default schema.
I advise to rename your linked tables to the original name (remove public_), that makes things much less confusing. The schema name is automatically added by Access when linking the tables.
I've got a database that resides on an SQL server box, and another in a separate mdb file.
Both contain similar data, but I'd like to run a query that checks unmatched records from a field that exists in both.
Is this something that's easy enough to do using ADO (VBA)? If so can you point me in the right direction?
The easiest would be to create a new Access Database or ADP, and link the tables from both the SQL server and the other MDB. That way you've got an interface to both from within the same instance, which allows you to query or join different tables.
Need to query my SQL server from Access using an ADO connection (for example), and then using something like:
Currentdb.CreateTableDef()
in Access to create a table (in Access) with the query results.
How can I do this?
Using DAO:
currentdb.execute "SELECT * INTO LocalTableName FROM SQLServerTable;"
The string inside the quotes should be identical in ADO but I don't use ADO much.
You could consider SQL DDL CREATE TEMPORARY TABLE syntax. From the Access 2007 Help:
When a TEMPORARY table is created it
is visible only within the session in
which it was created. It is
automatically deleted when the session
is terminated. Temporary tables can be
accessed by more than one user.
... my tongue is firmly embedded in my cheek :) This syntax doesn't exist in the Access Database Engine and never has. Instead, it's another example of the appalling state of the Access documentation on the engine side of the house. Caveat emptor.