How does QlikView handle NULL value?
The QlikView logic treats the following as real NULL values:
- NULL values returned from an ODBC connection.
- NULL values created as a result of a forced concatenation of tables in the load script.
- NULL values created as a result of a join made in the load script.
IS NULL condition in QlikView?
The IsNull function tests if the value of an expression is NULL and if so, returns -1 (True), otherwise 0 (False).
IS NOT NULL function in QlikView?
Thus, as you can see in the table, the data values in the field ‘Value’ gets evaluated by the Null() function which returns ‘-‘ if a null is encountered and returns ‘Value’ if a string or numeric value is encountered….ii. NULL() function.
| ID | Value | ValueNullConv |
|---|---|---|
| 0 | – | |
| 1 | NULL | – |
| 2 | – | – |
| 3 | 29 | Value |
What is AQL in QlikView?
AQL is Associative Query Logic which is what the QlikView engine uses to query the data held in RAM. It is patented by Qlik and the patent papers describe it in depth.
What is set analysis in qlik sense?
Set analysis offers a way of defining a set (or group) of data values that is different from the normal set defined by the current selections. Your selections automatically define the data set to aggregate over. With set analysis you can define a group that is independent of the current selections.
How do I write an if statement in qlikview?
If Function in Qlik Sense. The if() function evaluates an expression based on certain condition. If the expression evaluates to be True for that condition, then the ‘then’ value is return. But if it evaluates to be False then ‘else’ value is returned.
How do you write not equal to in qlik sense?
“-=” (it executes).
What is interval match in QlikView?
The IntervalMatch prefix is used to create a table matching discrete numeric values to one or more numeric intervals, and optionally matching the values of one or several additional keys.
Why we use set analysis in QlikView?
QlikView’s Set Analysis feature is used to segregate the data in different sheet objects into many sets and keeps the values unchanged in some of them. In simpler terms, it creates an option to not associate some sheet objects with others while the default behavior is all sheet objects get associated with each other.
How do you write if conditions in Qliksense?
What is Peek function in qlik sense?
Peek() returns the value of a field in a table for a row that has already been loaded or that exists in internal memory. The row number can be specified, as can the table. Negative numbers indicate order from the end of the table. …
What does it mean to have null value In QlikView?
Handling NULL values In QlikView. NULL is not a value. It is a lack of value. It is a placeholder that marks nothingness. NULLs have certain basic properties: All QlikView fields and all data types in a SQL database are NULL-able. In SQL, NULL does not have a data type.
When to deal with missing values in Qlik?
In Qlik, missing values play a key role in representing relationships (or the lack thereof) between entities. It’s important to deal with them appropriately. When handling common cases of “nothing”, it’s worth consistently addressing zero length strings or other values that might effectively be lacking a value.
What are the characters for white space In QlikView?
Note that there are several type of characters for white space: soft blanks (Chr (32)), hard blanks (Chr (160)), the tab character (Chr (09)) and ideographic space (#3000/Chr (12288)). If you use the trim functions, you should be aware that these only remove soft blanks and no other characters.
Can a null be selected in a list?
If you have a list box where you have a visible entry that is blank; that you can click on; that can be selected, then it is not a NULL. NULLs are never visible in list boxes and can never be selected. Instead, you have an empty string or some kind of white space.