| If IsNotNull(mylink.mycolumn) Then mylink.mycolumn Else “NULL” | If the Derivation field for an output column contained the following code, then the Transformer stage checks if the input column named mylink.mycolumn contains a null value. If the input column does not contain a null, the output column contains the value of the input column. If the input column does contain a null, then the output column contains the string NULL |
| If IsNull(mylink.mycolumn) Then “NULL” Else mylink.mycolumn | If the Derivation field for an output column contained the following code, then the Transformer stage checks if the input column named mylink.mycolumn contains a null value. If the input column contains a null, the output column contains the string NULL. If the input column does not contain a null, then the output column contains the value of the input column |
| NullToEmpty(mylink.mycolumn) | Returns an empty string if the input column is null, otherwise returns the input column value |
| NullToZero(mylink.mycolumn) | Returns zero if the input column is null, otherwise returns the input column value |
| NullToValue(mylink.mycolumn,42) | Returns the specified value if the input column is null, otherwise returns the input column value |
| setnull() | Assigns a null value to the target column |
NULL handling functions in Datastage
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