Replacing null values in a table
VBA Code - Replacing Null Values with 0
I'm a struggling to come up with a custom function that replaces Null values in a table with Zero.
My table in its basic form has two fields.
Field A: Client
Field B: Quantity
The data is pulled from elsewhere in the database, but when it extracts it will have the client, and quantities. but some clients will have a Null quantity. e.g. below:
Replacing Null Value with a zero
First, I am a novice to Access, but quickly learning. I have a query where I want to sum all the values in an Amount field that are between certain dates. So I have an expression, >(Date()+360) And <=(Date()+540), which grabs all the records between the dates I want and sums the values in the Amount field. This works great, as long as it finds records between those dates. If it doesn't, it returns Null.
If it returns Null, I want the Null result to be replaced with a zero. I have tried, and tried to make this work, but keep failing
error 94: invalid use of null
I have a large data table of values I am manipulating, and this pops up about halfway through. It is not surprising because there are a few fields that are completely null. But I can't simply skip over them, I need to just set all there values to zero.
Is function I can make that searches for null values and sets them equal to zero before I run my main program?
Replacing many values at once in a multiple values checkbox field.
I have a field on a form that allows users to select one or more different values. The values I set myself, and I made an error in naming one of them. I'd like to find all the records where this value was selected in that field and replace them with the correct version.
I tried simply renaming the value but all the records that had already had the incorrectly named version stayed the same.
Is there a way to fix this without going record by record and replacing the erroneously named value with the correct one? That would take forever.
updating field whose value is the word NULL and Not a typical 'null' value
I was given a table where in a text field, the value is NULL. (Actually spelled out like that.)
I need to convert that field to a date/time one. Which is being hindered by these values of NULL.
The problem is that when I put the word NULL in the field criteria spot, Access believes that I am referring to a value of 'null' and will not do the update.
I have done "NULL", NULL, =NULL, ="NULL", is NULL. and no success.
Please remember that the actual value is not 'null'. It is a text field that has the word NULL in the field.
Blanks upon import
I have a table in excel with the following data
ACCNO Address1 Address2 Address3 Address4 Address5 Postcode
I import it into a table called address which is fine. I then go to put it into another table (customer_register) using an append query but it kicks up a fuss saying it can't do it because of a data validation rule.
I’ve worked out this is because not everybody in the table in excel has full data, for example some people only have three address lines and when appending it to the new table it picks these up as blanks ("") rather than null values (is null) and refuses to do it.
is there any way of replacing these blank cells at import level rather than writing queries that will remove each one?I’m now faced with writing six queries to ensure all blanks are removed from address1,2,3,4,5 and post-code but I’d like a better way.
How do you change null values to zero?
I am trying to sum across columns in a table for which many cells have no value in them. When I do this, the sum returns a null value instead of adding zeroes to the other columns with numbers. I cannot figure out how to get the null values to be read as zero, and I don't want to manually enter zeroes bc there are 130000 rows. Can you help me
Nulls giving a lot of trouble
I have this huge table that I run queries off to get desired results. Now in that table of course there are some values and some nulls. So if I am trying to run a query which sums three of the rows with one null value, the result is a zero.
Now I am looking for a query that can help me update this table to keep all the records as it is and only changing the null values to zero so that adding the other values to zero can give me the desired result
Null values being incorrectly excluded
My query is excluding null values in error. Can someone assist me in where my code error is? I have one table I'm querying from and using two fields to filter. Here is the statement that is excluding the two discharge disposition types, but is also excluding all null values:
Or (tbl_finaloutput.[Discharge Disposition])<>"PVH Inpt/Outpt")
AND ((tbl_finaloutput.[Patient Type])="er"
I want to make sure I return all Null values in the Discharge Disposition field. For example, there may be another record where the patient type is "er" but the discharge disposition field is blank--this should be in the result because it's an "er" record. I know that I need to define that null values should be recognized as valid, but not sure how
Update where query not working
This should be simple but I can't figure it out.
I have a large table that contains NULL values and values like €0,00 in a field with the name price. I need to replace these values with €0,01
So I thought my rusty sql knowledge and google could help me solve this, but I am stuck.
To remove the null values I used the query:
SET tblItem.prijs = "€0,01"
WHERE (((tblItem.prijs) Is Null));
and that worked well to remove the NULL values and changed them to €0,01
00 to €0,01
SET tblItem.prijs = "€0,01"
WHERE (((tblItem.prijs) Is "€0,00"));
But it does not and I am puzzled why. It must be something very obvious that I am overlooking, but what?
Executing MySQL Statement
I have a variable that contains a perfectly acceptable MySQL statement (as in, I can copy it into mysql directly and it works) yet when I run it through CurrentDb.Execute VariableName I get "Too few parameters. Expected 1."
Which the makes
INSERT INTO ticketchanges VALUES (NULL,46,DEFAULT,'few af ae a',NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,2);
The only thing I can think of is that I'm not declaring the column names because as you can see by the code, it's rather dynamic. So.
Delete duplicates with conditions
I have a table with FieldA, FieldB, FieldC.
I want to delete records based on FieldA, leaving me with one unique record. The corresponding data in FieldB and FieldC is sometimes NULL - sometimes not.
How do I DELETE duplicate records based on FIELDA where FieldB and FieldC contain the most amount of data (or contain the least NULL values) I.e.
Field1, Field2, Field3
A , data , null | DELETE
A , data , data | KEEP
A , data , null | DELETE
B , null , null | DELETE
B , null , data | KEEP
B , null , null | DELETE
C , null , null | DELETE
C , null , data | DELETE
C , data , data | KEEP
Need null values for several fields in db
I have an equipment inventory db. I need to run a query that would give me the records that contain null values in several of the fields. I have run a successful query to return records that have a null value in one field but don't know how to combine so that query returns records that also have null values in other fields or any other fields.
Excluding null values on SQL table query
Tryed to search for this but couldnt find much on it. I'm creating a simple query off of an SQL table. I'm trying to filter out the blank values so naturally I tryed the "Is Not Null" command in the criteria for the field I wanted to filter. When I did this it would continue to return all the values in the table including the blank ones. I was able to succesfully filter them out with the command ' <>"" ' Does anyone know why this would work and not the "Is Not Null" command. Is it somethign to do with the fact that I'm accessing an SQL table
Count NULL togerther w/ No Stat records
CHAPTER FIELD1 FIELD2
1 NULL No Stat
1 No Stat NULL
1 NULL NULL
1 No Stat No Stat
1 otherVal otherVal
The result that I want:
CHAPTER COUNTfield1 COUNTfield2
I want to select records that contain either NULL or No Stat in either FIELD1 OR FIELD2
then Count #rec for any field that has NULL or No Stat
The problem is the count function does not count NULL, so I use IIf statement to replace NULL with No Stat. I can display those values on the screen correctly, but cannot count these NULL recs together with the No Stat recs. Please give me the SELECT statement that does this
Cannot get values for a Combobox..
I am trying to retrieve the unique names from a table into the combobox on a form. I have the attached code for the command button on the form.
'Invalid use of Null'.
if I use another table for a string value for the same recordset, the code works and the combobox gets populated with the unique names of the field selected.
I tried to retrieve the values for different fields from the table tblPlants, but I get the same error.
It appears that I cannot populate the combobox with any of the field values from the tblPlants. But the values are not Null - by using the code line for the MsgBox (msg), I am able to see the values in the MsgBox.
Or is it some other criteria I am missing?
Nz or IIF for problems with NULL
Not easy to explain, but a try:
I want to get the difference in % between the values of two columns of different tables. There are some fields with NULL and often occurs an error in the result fields where was a NULL. Its more complicated because its part of a left join.
So I think a solution is a combination of NZ and IIF but I am not sure how to use.
Here an example table:
Creating Null Value using IIF Statement in Query Builder
I have data that is formatted like this:
March 2010 | NULL
March 2010 | 10
March 2010 | 0
in a query. With Totals selected, I'm trying to find an average of values, while grouping by the Month/Year. In this instance, I want to ignore the NULL, and bring an average of 5. My suspicion is that I need to create an expression to remove the NULL values, making them blank.
Null or NOT in another table
I have a query that verifies that required fields in my records are populated and correct. Right now it returns the records that have required fields=NULL. Some of the fields need to be verified for legal values from another table as well. So I need to return values where the value of field [Tag]! [function_code] is not in [WM_GOC_Conversion]![Function_Code]
My current query is a datasheet with autoformat that marks the null- fields with yellow background. I'd like to be able to mark the wrong information with red text, but first I need to have a query that return the records!
Defining Null Values
A Null represents an unknown or a missing value. It is important to understand that a null value does not mean a zero of a text string of one or more blank spaces.