Bottom

Bottom() evaluates an expression at the last (bottom) row of a column segment in a table. The row for which it is calculated depends on the value of offset, if present, the default being the bottom row. For charts other than tables, the evaluation is made on the last row of the current column in the chart's straight table equivalent.

Syntax:  

Bottom([TOTAL] expr [ , offset [,count ]])

Return data type: dual

Arguments:  

• expr: The expression or field containing the data to be measured.
• offset: Specifying an offset n, greater than 0, moves the evaluation of the expression n rows further up from the current row. Specifying an offset of 0 will evaluate the expression on the current row. Specifying a negative offset number makes the Above function work like the Below function with the corresponding positive offset number.
• count: By specifying a third argument count greater than 1, the function will return a range of count values, one for each of count table rows counting upwards from the original cell. In this form, the function can be used as an argument to any of the special range functions. Range functions
• TOTAL: If the table is one-dimensional or if the qualifier TOTAL is used as argument, the current column segment is always equal to the entire column.

  Defining the aggregation scope

Limitations:  

• Recursive calls will return NULL.

• Sorting on y-values in charts or sorting by expression columns in tables is not allowed when this chart function is used in any of the chart's expressions. These sort alternatives are therefore automatically disabled. When you use this chart function in a visualization or table, the sorting of the visualization will revert back to the sorted input to this function.

Examples and results:  

Example 1:  

In the representation of the table chart shown in this example, the table is created from the dimension Customer and the measures: Sum(Sales) and Bottom(Sum(Sales)).

The column Bottom(Sum(Sales)) returns 757 for the all rows because this is the value of the bottom row: Divadip.

The table also shows more complex measures: one created from Sum(Sales)+Bottom(Sum(Sales)) and one labeled Bottom offset 3, which is created using the expression Sum(Sales)+Bottom(Sum(Sales), 3) and has the argument offset set to 3. It adds the Sum(Sales) value for the current row to the value from the third row from the bottom row, that is, the current row plus the value for Betacab.

Example 2:  

In the representations of table charts shown in this example, more dimensions have been added to the charts: Month and Product. For charts with more than one dimension, the results of expressions containing the Above, Below, Top, and Bottom functions depend on the order in which the column dimensions are sorted by QlikView. QlikView evaluates the functions based on the column segments that result from the dimension that is sorted last. The column sort order is controlled under Sort and is not necessarily the order in which the columns appear in a table.

In the first table, the expression is evaluated based on Month, and in the second table it is evaluated based on Product. The measure End value contains the expression Bottom(Sum(Sales)). The bottom row for Month is Dec, and the value for Dec both the values of Product shown in the table is 22. (Some rows are not shown, to save space.)

Please refer to Example 2 in the Above function for further details.

Example 3:  

The Bottom function can be used as input to the range functions. For example: RangeAvg (Bottom(Sum(Sales),1,3)).

In the arguments for the Bottom() function, offset is set to 1 and count is set to 3. The function finds the results of the expressionSum(Sales) on the three rows starting with the row above the bottom row in the column segment (because offset=1), and the two rows above that (where there is a row). These three values are used as input to the RangeAvg() function, which finds the average of the values in the supplied range of numbers.

A table with Customer as dimension gives the following results for the RangeAvg() expression.

Data used in examples:

Monthnames:

LOAD * INLINE [

Month, Monthnumber

Jan, 1

Feb, 2

Mar, 3

Apr, 4

May, 5

Jun, 6

Jul, 7

Aug, 8

Sep, 9

Oct, 10

Nov, 11

Dec, 12

];

Sales2013:

crosstable (Month, Sales) LOAD * inline [

Customer|Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec

Astrida|46|60|70|13|78|20|45|65|78|12|78|22

Betacab|65|56|22|79|12|56|45|24|32|78|55|15

Canutility|77|68|34|91|24|68|57|36|44|90|67|27

Divadip|57|36|44|90|67|27|57|68|47|90|80|94

] (delimiter is '|');

To get the months to sort in the correct order, when you create your charts, go to the Sort tab of the chart properties, and mark the checkbox Expression under Sort by. In the expression box write Monthnumber.