Applies to:  CELONIS 4.0 CELONIS 4.2 CELONIS 4.3 CELONIS 4.4 CELONIS 4.5 CELONIS 4.6 

Description

The ISNULL function returns an INT which indicates whether the input value is NULL. If the input value is NULL, 1 is returned, and 0 otherwise.

ISNULL should not be confused with the predicate operator IS NULL, which returns a boolean.

ISNULL can be applied to any data type.

Typically, ISNULL is used inside a condition, for example in a CASE WHEN or FILTER statement. However, as the function returns an INT, it is not restricted to be used with those statements.

In order to map NULL values to a different value, COALESCE or REMAP_VALUES can also be used instead of a CASE WHEN combined with ISNULL.

Syntax

ISNULL ( table.column )

Examples


[1] Return the result of the ISNULL operator for a STRING column and use it inside a CASE WHEN condition:

Query
Column1
ISNULL ( "Table1"."Country" )
Column2
CASE WHEN ( ISNULL ( "Table1"."Country" ) = 1 ) THEN '-' ELSE "Table1"."Country" END
Input
Table1
Country : STRING
'US'
'DE'
null
'IT'
'DE'
null
'FR'
Output
Result
Column1 : INTColumn2 : STRING
0
'US'
0
'DE'
1
'-'
0
'IT'
0
'DE'
1
'-'
0
'FR'



[2] Return the result of the ISNULL operator for a INT column and use it inside a CASE WHEN condition:

Query
Column1
ISNULL ( "Table1"."IntColumn" )
Column2
CASE WHEN ( ISNULL ( "Table1"."IntColumn" ) = 1 ) THEN 0 ELSE "Table1"."IntColumn" END
Input
Table1
IntColumn : INT
1
0
10
13
null
null
-5
Output
Result
Column1 : INTColumn2 : INT
0
1
0
0
0
10
0
13
1
0
1
0
0
-5


See also:

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