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.
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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 am new to access. I am using a tool/access database someone built, and it has an ODBC connection to an Oracle SQL database in it.
There are different queries on the side panel, and some of them are delete queries.
If I run these delete queries will they just modify data in my local access database without modifying the data in the Oracle Database?
Yes these will change something in the database whether its linked with another access database table or oracle table and within the database. To review the query you can open the queries in design view and run a normal select query so you can see what the queries are deleting. You can have a normal table image and or globe with a arrow in front pointing towards the table then its linked. A lot of times when I am testing I just run select queries and then I make a copy of what I will be deleting just in case anything goes wrong.
In the past, I have been querying various different databases (let's call them DB1, DB2, and DB3) by using Data->From Other Sources->From SQL Server in Excel. However, I want to be able to perform just one query (say, DBMaster) and using this to populate my data.
My thoughts: Use linked servers. I create DBMaster with linked servers to DB1, DB2, and DB3. However, I do not know how to access those individual databases from Excel. When I connect to DBMaster, I only get the tables on that database, not the tables on the linked servers. Does anyone know how I can do this?
Thank you!
You just need to connect your master database and exceute your query from there.
Just remember to put the server name before database name in your sql in FROM clause like :
[SERVER].[DATABASE].DBO.[TABLE_NAME]
When I right click on the database I want to export data from, I only get to select a single table or view, rather than being able to export all of the data. Is there a way to export all of the data?
If this is not possible, could you advise on how I could do the following:
I have two databases, with the same table names, but one has more data than the other
They both have different database names (Table names are identical)
They are both on different servers
I need to get all of the additional data from the larger database, into the smaller database.
Both are MS SQL databases
Being that both are MS SQL Servers, on different hosts... why bother with CSV when you can setup a Linked Server instance so you can access one instance from the other via a SQL statement?
Make sure you have a valid user on the instance you want to retrieve data from - it must have access to the table(s)
Create the Linked Server instance
Reference the name in queries using four name syntax:
INSERT INTO db1.dbo.SmallerTable
SELECT *
FROM linked_server.db.dbo.LargerTable lt
WHERE NOT EXISTS(SELECT NULL
FROM db1.dbo.SmallerTable st
WHERE st.col = lt.col)
Replace WHERE st.col = lt.col with whatever criteria you consider to be duplicate values between the two tables.
There is also a very good tool by Redgate software that syncs data between two databases.
I've also used SQL scripter before to generate a SQL file with insert statements that you can run on the other database to insert the data.
If you right-click on the database, under the Tasks menu, you can use the Generate Scripts option to produce SQL scripts for all the tables and data. See this blog post for details. If you want to sync the second database with the first, then you're better off using something like Redgate as suggested in mpenrow's answer.
Is it possible to search and replace all occurrences of a string in all columns in all tables of a database? I use Microsoft SQL Server.
Not easily, though I can thing of two ways to do it:
Write a series of stored procedures that identify all varchar and text columns of all tables, and generate individual update statements for each column of each table of the form "UPDATE foo SET BAR = REPLACE(BAR,'foobar','quux')". This will probably involve a lot of queries against the system tables, with a lot of experimentation -- Microsoft doesn't go out of its way to document this stuff.
Export the entire database to a single text file, do a search/replace on that, and then re-import the entire database. Given that you're using MS SQL Server, this is actually the easier approach. Microsoft created the Microsoft SQL Server Database Publishing Wizard for other reasons, but it makes a fine tool for exporting all of the tables of a SQL Server database as a text file containing pure SQL DDL and DML. Run the tool to export all of the tables for a database, edit the resulting file as you need, and then feed the file back to sqlcmd to recreate the database.
Given a choice, I'd use the second method, as long as the DPW works with your version of SQL Server. The last time I used the tool, it met my needs (MS SQL Server 2000 / 2005) but it had some quirks when working with database Roles.
In MySQL, you can do it very easily like this:
update [table_name] set [field_name] = replace([field_name],'[string_to_find]','[string_to_replace]');
I have personally tested this successfully on a production server.
Example:
update users set vct_filesneeded = replace(vct_filesneeded,'.avi','.ai');
Ref: http://www.mediacollege.com/computer/database/mysql/find-replace.html
A good starting point for writing such a query is the "Search all columns in all the tables in a database for a specific value" stored procedure. The full code is at the link (not trivial, but copy/paste it and use it, it just works).
From there on it's relatively trivial to amend the code to do a replace of the found values.