I am New in MS Access My Question is How to make AutoNumber Column to make an Random Numbers but with some Condition like Make Number from 10 digits only and Positive
As far as I know:
There is an option to Randomly generate an AutoNumber column. There isn't an option to make them only positive and 10 digits.
I actually use this in one of my tables, and typically the length is 8+ digits, however there are negative numbers. Neither fits your criteria.
If you go to the design view of your Table, select the column in question. Make sure the Data Type is AutoNumber, and locate the Field Properties pane at the bottom. You can select Random in the New Values dropdown list.
Unfortunately, I think you would have to take this into your own hands and create a public function to do this for you.
Related
Recently I have been using Microsoft SQL for creating databases that are referred to using an excel document. There have been a number of instances when I needed to make a small changes to my tables and ended up "DROP"-ing all my current tables and re-creating them using an updated query. I understand you can use UPDATE to change the values of records within a table, but I'm looking to manipulate a data type so that I can change the number of decimals in one record of my tables from 2 to 3. Code for creating the table looks something like this:
CREATE TABLE WIRE_INDEX
--"Field" "Data Type" "Null or Not"
(...
...
DENSITY decimal(18,2) Not Null);
I don't know if the solution is something obvious, but I have been unable to find anything useful. I'm not sure know how to refer to the data type of a field in SQL.
When I populate the database I use numbers like 0.283 and 0.164, but when I SELECT the record I only get the first two decimals. I'd like the first 3 decimals to appear in the way I enter them into the table.
(edit didn't show up properly)
(not sure if I'm supposed to post my solution), but credit to TEEKAY and Apurav for answering my question. I used the code posted by Apurav which looks like this:
ALTER TABLE WIRE_INDEX
ALTER COLUMN DENSITY decimal(18,3) Not Null
When I pulled the table, using a SELECT statement the precision showed three decimal places, but I lost the precision of my input and had to re-enter my values using UPDATE. Not sure if this is more effective than just starting over, but it worked for me and now I know.
I'm stuck with excel/vba:
I've got a 10 row x 30 column blank array in Excel. I am trying to distribute 10 integers from a known group of 10 (say 1,1,1,1,1,1,3,5,7,9) into each column randomly so that each row of the column contains one of the group (and all of the group members are used once), and I need the second column to contain another random distribution of the same group and so on.
So I'd end up with 30 columns of 10 rows each, with each column containing a different random distribution of the same 10 integers. I want to be able to change the distribution in each row by recalculating the spreadsheet too.
Is there a quick way to do this? Short of arranging 30 different rand() sorted lists and using lookups I couldn't see a way. I'm not savvy enough with VBA to have a go. If someone can point me in the right direction, I'd be eternally grateful!
Perhaps I'm missing something obvious, though this does not seem to be so straightforward using worksheet formulas alone.
If your orginal list of values is in A1:A10, then, in B1:
=INDEX($A$1:$A$10,RANDBETWEEN(1,10))
and in B2, array formula**:
=INDEX($A$1:$A$10,INDEX(MODE.MULT(IF(COUNTIF($A$1:$A$10,$A$1:$A$10)-COUNTIF(B$1:B1,$A$1:$A$10),{1,1}*ROW($A$1:$A$10))),RANDBETWEEN(1,10-ROWS($1:1))))
Copy the above down to B10.
You can then copy the formulas in B1:B10 to the right as desired.
Regards
**Array formulas are not entered in the same way as 'standard' formulas. Instead of pressing just ENTER, you first hold down CTRL and SHIFT, and only then press ENTER. If you've done it correctly, you'll notice Excel puts curly brackets {} around the formula (though do not attempt to manually insert these yourself).
You could make a loop in which you make an array with your 10 numbers. Then loop though 30 columns, with first adding another column of 10 randomly drawn numbers to your array. See this website on how to draw random numbers. Then sort the array on the second column and post the first column.
Edit:
As I read in the comments on the other answer, the purist solution would be to:
Assign each unique option of values a random value
Sort these random values either from top to bottom or bottom to top, and select the top one.
Place it in the first row
Do the same thing again for the second row, but keep track of the sum of all the unique options, as to rule out an option once it maxed its presence.
Edit2:
Once I just clicked post I thought this a bit more through and came to the conclusion that the last digit will allmost always be 1 in this case....
I have a very large array of data with many columns that display different outputs for the values presented. I would like to add a row above the data that will display the most common occurring value or word below.
Generally I would like to have each top of the column (right under the column label in row 1) have the most common value below. I will then use this value for various data analysis functions!
Is this possible, and if so, how? Preferably this will not require VBA, but simply a short code in the cell.
One caveat: The exact values may vary, so there is no set list where I can say "it will be one of these."
Any ideas appreciated!
Try a series of =COUNTIF(A:A,"VALUE TO SEARCH") functions if you want to stay away from VBA.
Otherwise, the best method would be to iterate through each column via VBA. With this method, you can even count the "varying" values and return the count and/or the value itself.
http://www.excel-easy.com/examples/most-frequently-occurring-word.html
This is a single formula you would write at the top of each column. Does not require VBA. You can replace the set range to an entire column, such as (A:A) instead of (A1:A7).
If you mean an array as in a data type, it could work differently but it depends what you're trying to do.
With data from A3 through A16, in A2 enter:
=INDEX($A$3:$A$16,MODE(MATCH($A$3:$A$16,$A$3:$A$16,0)))
This will work for text as well as numbers. Adjust this to match the column size.
I have a external data column that brings number and text.
External data: 10000 text
I need to retrieve only the number of that external data column to calculated column. And the number is always 5 digits.
I have tried LEFT, FIND, TRIM... but nothing seems to be good enough to SharePoint 2010 to accept.
Please help!
Not sure if that's what your trying to achieve, but this formula works fine within my Calculated Column:
=LEFT([External Data],5)
I don't know the best way to describe my problem and I'm just looking for a push in the right direction, or where to start. I'd be perfectly happy with an answer that's a very useful link or pseudo code.
My problem, I have a database that's about to hit the MS Access hard coded 2 GB database limit and I don't want to split the database.
What I think is a possible solution - make the database more efficient in it's data storage. I think, but don't know if this is true, that I could do this by turning some string fields into numeric fields. Stay with me...
For instance:
My database has several million records of a field we'll call TooLongString
Each value is about 50 characters
Every record has a value for this field
There's only 9 possible values for TooLongString
Would it decrease my database size to instead store a number that
represents one of the 9 possible values and store the text value in a small table? (So go from 50 characters to 1 character several million times)
Did I explain my issue correctly? Is my potential solution actually a solution? How would I go about doing this?
Thanks!
The short answer is yes, that would reduce the size of your database. You could have a second table that holds the nine possible values for "TooLongString" and just store the ID of the appropriate answer in the main table, as you suggested. You would then need to join these tables when pulling the data out in order to retrieve the actual text instead of the ID.
I would set up your new table first, then add a new column for the ID into your existing one. As there are only nine possible values, I'd be tempted to just manually run an UPDATE query nine times, e.g. if the first string in your new table is "MyFirstString" with ID 1, you could run "UPDATE existingTableName SET newColumn = 1 WHERE oldColumn = 'MyFirstString'". Do this for each of the nine values then you can remove the old string column from your table at the end.