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NULL - script and chart function

The Null function returns a NULL value.

Syntax:  

Null( )

Example: Data load script

In this example, an inline table with four rows is loaded, where the first three lines contain either nothing, - or 'NULL' in the Value column. We want to convert these values to true NULL value representations.

The middle preceding LOAD performs the conversion using the Null function.

The first preceding LOAD adds a field checking if the value is NULL, just for illustration purposes in this example.

NullsDetectedAndConverted: LOAD *, If(IsNull(ValueNullConv), 'T', 'F') as IsItNull; LOAD *, If(len(trim(Value))= 0 or Value='NULL' or Value='-', Null(), Value ) as ValueNullConv; LOAD * Inline [ID, Value 0, 1,NULL 2,- 3,Value];

This is the resulting table. In the ValueNullConv column, the NULL values are represented by -.

Resulting table
ID Value ValueNullConv

IsItNull
0   - T
1 NULL - T
2 - - T
3 Value Value F