Using MS Access to create a Running Total or a Cumulative Sum (Grouped Data) – Part 2 of 2 Using MS Access to create a Running Total or a Cumulative Sum – Part 1 of 2 Archives. A query gave me the following results: Person Total. R-Robert 100. I would like the query to change R-Robert to Robert such that the result is: Person Total. Robert is not a record. I just want the query to indicate the Person Robert instead of R-Robert. How can I do this?
-->Grouping is one of the most powerful capabilities of LINQ. The following examples show how to group data in various ways:
By a single property.
By the first letter of a string property.
By a computed numeric range.
By Boolean predicate or other expression.
By a compound key.
In addition, the last two queries project their results into a new anonymous type that contains only the student's first and last name. For more information, see the group clause.
Example
All the examples in this topic use the following helper classes and data sources.
Example
The following example shows how to group source elements by using a single property of the element as the group key. In this case the key is a string, the student's last name. It is also possible to use a substring for the key. The grouping operation uses the default equality comparer for the type.
Paste the following method into the StudentClass class. Change the calling statement in the Main method to sc.GroupBySingleProperty().
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Example
The following example shows how to group source elements by using something other than a property of the object for the group key. In this example, the key is the first letter of the student's last name.
Paste the following method into the StudentClass class. Change the calling statement in the Main method to sc.GroupBySubstring().
Example
The following example shows how to group source elements by using a numeric range as a group key. The query then projects the results into an anonymous type that contains only the first and last name and the percentile range to which the student belongs. An anonymous type is used because it is not necessary to use the complete Student object to display the results. GetPercentile is a helper function that calculates a percentile based on the student's average score. Windows 7 activator free download. The method returns an integer between 0 and 10.
Paste the following method into the StudentClass class. Change the calling statement in the Main method to sc.GroupByRange().
Example
The following example shows how to group source elements by using a Boolean comparison expression. In this example, the Boolean expression tests whether a student's average exam score is greater than 75. As in previous examples, the results are projected into an anonymous type because the complete source element is not needed. Note that the properties in the anonymous type become properties on the Key member and can be accessed by name when the query is executed.
Paste the following method into the StudentClass class. https://storiesnin.netlify.app/barcode-ocx-ware-access.html. Change the calling statement in the Main method to sc.GroupByBoolean().
Example
The following example shows how to use an anonymous type to encapsulate a key that contains multiple values. In this example, the first key value is the first letter of the student's last name. The second key value is a Boolean that specifies whether the student scored over 85 on the first exam. You can order the groups by any property in the key.
Paste the following method into the StudentClass class. Change the calling statement in the Main method to sc.GroupByCompositeKey().
