I have been trying to find this. I am using access 2010 and I have some data in a few tables and I want to select the last row from each one and add them to a new database. All the databases have random ID so I can't use the Sort by ID function.
If the table is small, you can pass it to a datatable in the frontend and use something like this,
lastRow = datatable.rows(datatable.rows.count-1)
Else, You can add a 'created_datetime' field in database which holds the inserted datetime and retrieve its maximum date since your ID field has random number...
open vba (alt + F11)
dim rst as recordset
set rst = docmd.runsql (sql statement here) e.g. (select * from tablename)
rst.movelast
you've gotten to your last record in vba
you can add it to a new table database by using an insert statement.
Related
I have spent a few hours searching for a similar Problem to mine. though there are a few replies, i could not find any to the Point.
so basically, i have two tables. one is a Standard Access table (table1) and the other is a table imported from Excel (table2). now table2 has the field names of table 1 and also a few other extra fields that i dont Need. now i want Access to compare These two tables and copy into table 1 the contents of whichever fields that it can match from table 2.
i have tried INFORMATION_SCHEMA.COLUMNS, but the code does not seem to recognise this Expression.
can anyone suggest some ideas please!!! can give more Details if required.
Thanks a lot..
saran
Something like this would give you the field names.. If static field names, id suggest importing to a table, derrived from your current import, and delete and append rather importing each time, and use a join as suggested.
Dim a As ADODB.Connection
Set a = New ADODB.Connection
Dim r As ADODB.Recordset
Set a = CurrentProject.Connection
Set r = a.OpenSchema(adSchemaColumns)
r.Filter = "[TABLE_NAME]='Your table name'"
or another way
r.open "Select * from table",a,1
loop r.fields
I have a column called "product-code". These are all populated. I am wanting to do a query that will insert a ' at the start of each field and then another query to add a ' at the end of the field.
So for example at the moment a product code might be fmx-2, after the query I would want it to look like 'fmx-22'
I am looking to do this for all the data sets within the table. I am using Microsoft Access
Thanks
In Microsoft Access you can use & char to concatenate string, and your query could be something similar:
update my_table set product_code = "'" & product_code & "'";
How to add new items in listbox using VBA in ms access. i tried listbox.addnew property in VBA but facing error.
i actully wrote list6.addnew (Hotel_Name,id). Here Hotel_Name is the variable holding name of hotel and Id is holding primary key value.
I've used several methods to populate a listbox.
Directly in the property sheet of the listbox, set the Row Source to:
SELECT tblTable.Field, qryQuery.Field FROM tblTable
Throw in some AS after each field name and you can rename the headers the listbox creates so that it is easier to read on the form than your table or query field names Add a WHERE statement to filter as you need it. You can get results from tables, queries, or both.
Same sort of thing in VBA:
Dim rec As DAO.Recordset, sql As String
sql = "SELECT Field1, Field2, Field3, Field4 FROM tblTable WHERE Field1 = "Filter Example"
Set rec = CurrentDb.OpenRecordset(sql)
listbox0.column0 = rec(0)
listbox0.column1 = rec(1)
listbox0.column2 = rec(2)
listbox0.column3 = rec(3)
Those are the two I would recommend. The Property sheet method is quick and easy, but harder to track and modify in development than the VBA method. (VBA has a good FIND tool built in to search for specific string values)
Is there a way to be prompted before you a run an SQL query in Access, to enter in the table name that you wish to query? For example, lets say the columns will always stay constant. The columns could be called "Fruit" and "Date." But, the table name could change depending on the batch number. Ie. table name could be "BatchNO_1" or "BatchNO_2" or "BatchNO_3" etc. So Lets say i have an SQL like:
select Fruit, Date from BatchNO_1 where Fruit = "Apples"
Is there a way that I can be prompted to enter in the table name and have the SQL use the table name i enter to perform the query?
No. The table name cannot be passed as parameter to a query. You will have to construct the query yourself.
Dim tableName as String, sql As String
tableName = InputBox("Please enter the table name")
If tableName <> "" Then
sql = "SELECT Fruit, Date FROM [" & tableName & "] WHERE Fruit = 'Apples'"
'TODO: execute the query here
End If
For instance, you could change the query text of an existing query like this:
CurrentDb.QueryDefs("myQuery").SQL = sql
Or you could execute the query like this
Dim db As DAO.Database, rs As DAO.Recordset
Set db = CurrentDb
Set rs = db.OpenRecordset(sql)
Do Until rs.EOF
Debug.Print rs!Fruit & " " & rs!Date
rs.MoveNext
Loop
rs.Close: Set rs = Nothing
db.Close: set db = Nothing
By putting the batch number in the table name instead of as a column, you are encoding data in the schema. This is not best practice, so in my opinion, the correct answer is to change your database design.
Make a single Batch table with all the columns from your current BatchNo tables, but add a column named BatchNo as part of the primary key. Load all the data from your BatchNo tables into this one, and then delete those tables. Then your query will straightforwardly look like this:
SELECT Fruit, Date
FROM Batch
WHERE
Fruit = "Apples"
AND BatchNo = [Enter Batch No];
Don't put data in table names. That is not the way databases are supposed to be made.
Just to explain a little bit, the reason that your current design violates best practice is due to exactly the problem you are facing now--the shenanigans and weird things you have to do to work with such a design and try to perform operations in a reasonable, data-driven, way.
By having the user enter the table name, you also create the danger of SQL injection if you aren't also careful to compare the user-provided table name to a whitelist of allowed table names. While this may not be such a big deal in Access, it is still heading down the wrong path and is training for something else besides professional database work. If you would ever like to grow your career, it would be regrettable to first have to unlearn a bunch of stuff before you could even start with a "clean slate" to learn the right way to do things.
I would like to use a query to loop through tables that are similar in structure but have different names (ie. tableJan2011, tableFeb2011, tableMar2011 etc.)
Is there a way in MS Access and in SQL Server to use the same query statement while varying the table name within it. (similar to using parameter values) (need this to add different input to each different month's table)
This is a bad table design. You should have a singe table, where you have a column(s) to indicate month/year. You would then just query this single table and add a WHERE month='X' and YEAR='Y' to limit your results to what you need.
without a table redesign use UNION and clever WHERE clause parameters, which will cause rows to only come from the table that applies.
SELECT
..
FROM tableJan2011
where...
UNION
SELECT
..
FROM tableFeb2011
where...
UNION
SELECT
..
FROM tableMar2011
where...
First off, listen to the people who are telling you to use one table. They know of which they speak.
If you can't do that for some obscure reason (such as inheriting the design & not being allowed to change it), then you're stuck writing VBA code. There's no way that I know of, in Access, to substitute source tables (or even source columns--values only), in a saved QueryDef.
You'll need something like this:
Private Function QueryTable (strTableName as String) As DAO.Recordset
Const theQuery as String = "SELECT tbl.* FROM [table] As tbl"
Dim sSql As String
Dim db As DAO.Database
Dim rs As DAO.Recordset
sSql = Replace(theQuery, "[table]", strTableName)
Set db = CurrentDb()
Set rs = db.OpenRecordset(sSql)
Set QueryTable = rs
End Function
Note that this is simplified code. There's no error handling, I haven't released the objects (which I usually do, even though they'll go out of scope), and SELECT * is almost always a bad idea.
You'd then call this function wherever you need it, passing in the name of the table.
consider moving the year and month out of the table name and into columns in one table.
you can create a table with query or table names to use at runtime, but you have to be able to write Access BASIC code in a module.
Here's an example, assuming you have a query built on a table with the query names you want to execute:
Set db = CurrentDb
Set rsPTAppend = db.OpenRecordset("qry_PTAppend")
rsPTAppend.MoveFirst
Do Until rsPTAppend.EOF
qryPT = rsPTAppend("PT")
Set qdef = db.QueryDefs(qryPT)
sqlOld = qdef.sql
sqlNew = sqlOld
' manipulate sql
If sqlNew <> sqlOld Then
qdef.sql = sqlNew
End If
db.QueryDefs(rsPTAppend("append")).Execute
If sqlNew <> sqlOld Then
qdef.sql = sqlOld
End If
rsPTAppend.MoveNext
Loop
Don't know what is possible in Access but in SQL Server you could create a view that use union to get all tables together and then build your queries against the view.
One other option you have could be to build your queries dynamically.
In sql server you can execute a string as sql.
http://msdn.microsoft.com/en-us/library/ms175170.aspx
I'm not aware of anything similar in MS Access (though my experience is limited). You could however dynamically generate your sql in code to accomplish this. Perhaps you could create a function to take the table suffix and parameters and build the desired sql that way.