I use C++ Builder 6.0
I use TADODataSet execute following SQL statement:
SELECT Id, SUM(Saldo) AS Saldo
FROM Table
GROUP BY Id
I use this DataSet only for reporting. No need update date back to database.
When I try to modify field "Saldo"
adospCard->Edit();
adospCard->FieldByName("Saldo")->AsFloat=0.0;
adospCard->Post();
I get error:
Field 'Saldo' cannot be modified.
I add this line
adospCard->FieldByName("Saldo")->ReadOnly=false;
and error no more occurred, but field 'Saldo' has not changed.
adospCard->Edit();
//adospCard->FieldByName("Saldo")->AsFloat=1536.5
adospCard->FieldByName("Saldo")->AsFloat=0.0;
//adospCard->FieldByName("Saldo")->AsFloat=0
adospCard->Post();
//adospCard->FieldByName("Saldo")->AsFloat=1536.5
Howe to change ‘Saldo’ field value?
Add a calculated field to your dataset.
Calculate the right value for Saldo
in this calculated field (you can
use Saldo as source for it if you
want to)
display this calculated field in your report in
stead of the Saldo field.
Edit:
For examples of how to add calculated fields, see for instance here, here and here.
--jeroen
As ldsandon said, you cannot modify the "Saldo" field as it is computed.
If you need to set the value to zero when Id is "something" you are better off doing it in your query. The best approach depends on the criteria for setting the value to zero.
Or, save the results of the original query in a temp table then modify that before returning the results to the report.
Finally, what reporting tool are you using? Can that do the "Saldo = 0" change when rendering the report?
Consider storing your result in a ClientDataset - if you can be assured the result isn't too large.
I don't use "TADODataSet" so the following may not apply :)...
When I do the same (or similar) using my DB of choice (i.e. Advantage Database Server) I would use the INTO clause, albeit, with a TSQLQuery component (with the RequestLive property enabled). For example:
SELECT Id, SUM(Saldo) AS Saldo INTO #TempTable FROM Table GROUP BY Id
Related
I am stuck while dynamically forming a new column based certain WHERE clause from another Table in PowerBi. To give more details, let's say I have a table with item numbers associated with a Customer Name. In another table, I have to add a new column, which will dynamically add the item numbers associated with a particular customer and append as a query parameter to a base url.
So, my first table looks like this:
The second table that I want is this:
The query parameter value in the URL, has to be dynamically based on a SELECT query with a WHERE clause and pick up the ItemNumbers using the Customer field which is common between both. So, how can this be done in PowerBi? Any help would be really appreciated :)
I have one table in my model "TableRol" if I want to summarize my Date as the string I can use CONCATENATEX;
URL = CONCATENATE(CONCATENATE("http:\\mysite.com\parametersHere\getitem?='",CONCATENATEX(VALUES('TableRol'[Date]), 'TableRol'[Date],";")),"'")
I'm making a Microsoft Access table where one of the fields is a list of pre-made options. When I make a SQL query on that table it returns the values of the list as strings containing the spelled out choice. I would like to assign numerical values to each element of the list so a SQL query returns a number instead. How do I do this? I know it's possible because I have an access file with such a list but I'm unable to recreate it.
An easy way to do this is to have your combo box use a query of the table as a Rowsource. This query would have the table unique ID in the first field and the field you wish to return as the second field. Then change the setting on the combo box for "Column Count" to 2. If you want to show both fields change the "Column Widths" value to 1"; 1". If you want to show only one field, change the value of one you do not want to see to 0. Now we you refer to this list in an SQL queries, it will use the ID field but show the user the string field.
I have a flowfield that sums up a decimal value, but I need to limit the value in a report based on a date field that will be supplied as a parameter in a
report. How best do I achieve this?
a shortened version the CALC formula in the field definition looks like this:
Sum("MyTable".Unit WHERE (Institution=FIELD(No)))
When the report is run, there is a filter on MyTable based on a date field.
Does this field evaluate to the total sum of all the records, or just the filtered values?
No. Just filter on any field doesn't applies to flow fields.
You must use flowfilter to achieve this.
Your code should look like this:
MytableVar.reset;
MytableVar.setrange("Date Filter", 0D, TODAY);
MytableVar.calcfields(Unit);
where Date Filter is a field in the My Table with type flowfilter.
If My Table is used as Source Table it will work in tha same way. Just apply filter to Date Filter field.
For further reference see Inventory filed in the Item table.
I have this table in Power BI, But I can't do another table.
How I can do this?
Now the values are grouped by date (different fields have information under one date, next the same fields are grouped by another date)
I want the values in the columns to be grouped by field (one field has date information next to it).
Edit1:
I can't set Date on the 2nd place in the grouping
Because date is column, traffic,orders,rev,costs- are values
You need to set Date on the 2nd place in the grouping, after a field containing traffic, orders, etc.
EDIT:
You need to unpivot these columns first, for example, in PowerQuery. Use Edit Query. This results in transforming your 4 columns to 2: Attribute and Value. Attribute will be your first grouping parameter. 2nd will be Date. Value column goes to values.
If you need your source query somewhere else, you may create new query for this very report only. It is done by first right-clicking original one and selecting Reference Query, and the doing any edits. This will keep original query intact.
I'm using the following: dynamodb2, boto, python. I have the following code for creating a table:
table = Table.create('mySecondTable',
schema=[HashKey('ID')],
RangeKey('advertiser'),
throughput={'read':5,'write':2},
global_indexes=[GlobalAllIndex('otherDataIndex',parts=[
HashKey('date',data_type=NUMBER),
RangeKey('publisher', date_type=str),
],throughput={'read':5,'write':3})],
connection=conn)
I would like to be able to have the following data that I can query by:
ID, advertiser, date, publisher, size, and color
That means I need a different schema. When I add additional points it does not query unless the column name is listed in the schema.
The problem however is that right now I am only able to query by Id, advertiser, date, and publisher in this case. How can I add additional columns that I can query by?
I read this which appears to say that it is possible:
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GSI.html
However there is no example here:
http://boto.readthedocs.org/en/latest/dynamodb2_tut.html
I tried adding an additional range key however it doesn't work (cannot have duplicates)
I'd like it to be like:
table = Table.create('mySecondTable',
schema=[
RangeKey('advertiser'),
otherKey('date')
fourthKey('publisher') ... etc
throughput={'read':5,'write':2},
connection=conn)
Thanks!
If you want to add additional range keys you need to use Local secondary index.
You can query the LSI in the same way that you query the base table. You need to provide an exact value for the hashkey and a comparison-predicate for range key.