How to create a view in ServiceNow that combines multiple columns (same data type) into one by picking the first non-null value? Note that it should not actually modify the underlying data.
After a search of the documentation I thought I had an answer with function fields, but GlideFunction doesn't seem to have nvl/coalesce as a function. The functionality called coalesce in ServiceNow seems to relate to importing/permanently modifying data only.
An example would be if you have employee and department, both of which have a location field. Show the employee's location unless it is null, otherwise show the employee's department's location.
In standard SQL, I would do it like this:
CREATE VIEW my_view AS (
SELECT COALESCE(employee.location,department.location) AS location
FROM employee JOIN department
ON employee.department_id = department.department_id
);
You have not mentioned how you are going to query this view. SNOW does not give us control over selection while designing views like the standard SQL.
Use GlideRecord to conditionally select the columns based on nullability.
Related
I am making a data mode. Involve a list of values to bind with parameter. Just want to ask if adding :xdo_user_name as the list of value sql parameter is possible?
I am hoping that user login， the menu will only show related data to him.
Many thanks.
Not sure if this can work or not.
You could create a List Of Values - Type SQL Query
select :xdo_user_name as USER_ID from dual
Now create new parameter of (parameter) type Menu and based on the above LOV. Next, in your datamodel you can use the newly created parameter any way you need.
I'm using the ODBC connector to query time card data from the time_card table in ServiceNow, and there are two columns I'm wondering about: category and dv_category - those two fields are pulled from somewhere, and I do not know where. Is there are table that holds these values, or are they static on the UI and passed through?
The 'category' field is just a string(40) with a Choice List local to the field. So, it's not a reference field, just a drop down. The Choice List can be modified
I'm not finding the 'dv_category' field on the time_card table and I'm on Helsinki Patch 3. Can you clarify?
Editing to add the actual answer to the question : 'I believe the table you're looking for is called 'sys_choice''
This is my first post ever and haven't come across any other questions related to this. I am attempting to try and create a hybrid validation type and add it to an existing oracle form. We have a super/subset type of thing going on. When one chooses something from a dropdown, there are 5 options. If 4 of those options are chosen, the data is pulled from one validation table dataset, table A. If the other option is chosen, it comes from a different table's dataset, table B. These (along with others items) are saved in Table C. Table C has a FK constraint regarding these validations. I have added another column to table C to attempt to bypass the FK constraint, but the field still tries to save in the FK column. I can't seem to figure out if I need to add a database trigger, an item level trigger, or a form level trigger to reroute the data to correct columns in the database. Thanks in advance for any help!
If your items are select lists, you would use an item level trigger (when-validate-item) on the superset list item to populate/repopulate the list for the subset item.
Alternatively, you could use a popup LOV on the subset item which has a query which is filtered by the value of the superset item.
I have created a view for a table as:
CREATE VIEW anonymous_table
AS SELECT id, value FROM sensitive_table
and would like the id field of sensitive table to be obfuscated somehow, like an MD5 hash or something similar so that people querying the view can't see the actual id. What is a good way to do this in Hive?
Some options:
Don't include ID in your view at all:
CREATE VIEW something AS SELECT "HIDDEN ID", value from sensitive_table;
If you still need there to be a distinct key available for each record, you could write a UDF to do whatever transformation you like:
ADD JAR mycode.jar;
CREATE TEMPORARY FUNCTION hash as 'com.example.MyUDF';
CREATE VIEW something as SELECT hash(id), value from sensitive_table;
BONUS: Seeing as your users can just look at the sensitive table anyway, you could hash the IDs before they arrives in hive? This is probably the best option honestly.
Either way, if you're processing the ID's, having a stable hashing function would be what you need if people still need to rely on the ID's for joining / aggregation, etc.
Here is the link to how to create a UDF
(VS2008) I'm trying to configure a TableAdapter in a Typed DataSet to return only a certain subset of columns from the main schema of the table on which it is based, but it always returns the entire schema (all columns) with blank values in the columns I have omitted.
The TableAdpater has the default Fill and GetData() methods that come from the wizard, which contain every column in the table, which is fine. I then added a new parameterized query method called GetActiveJobsByCustNo(CustNo), and I only included a few columns in the SQL query that I actually want to be in this table view.
But, again, it returns all the columns in the master table schema, with empty values for the columns I omitted.
The reason I am wanting this, is so I can just get a few columns back to use that table view with AutoGenerateColumns in an ASP.NET GridView. With it giving me back EVERY column i nthe schema, my presentation GridView contains way more columns that I want to show th user. And, I want to avoid have to declare the columns in the GridView.
When you add a new query to a given TableAdapter, it is going to assume the schema in which it is attached to, which is why you are getting blank values for the columns you don't want.
Since you mentioned having already created the procedure, what you need to do is use the Server Explorer to connect to the database and simply drag that stored procedure over into your XSD work area. What this will do is create a separate QueryAdapter that will have just the columns you specified (still strongly typed) and you can bind/interact with your GridView using that QueryAdapter instead.
Is the strongly typed dataset used in another query that returns all the rows from the table?
What you could do is create a dataview using the strongly typed dataset and expose a data table for your DataGridView.
I'm not sure what your requirements are totally, but this example should help you:
DataView dv = new DataView(ds.<Your_Table>);
// This will create a new data table with the same name,
// But with only two columns from the original table.
// This could then be bound to your data grid.
DataTable dt = dv.ToTable(false,
ds.<Your_Table>.<Your_Column1Column>.ColumnName,
ds.<Your_Table>.<Your_Column1Column>.ColumnName);
Just delete the columns you don't want at run-time before you bind to your Gridview. The underlying class is still just a DataTable after all.