I want to assign NULL values to certain columns in a SQL transform:
SELECT
NULL as 'column_x',
NULL as 'column_y',
column_z
FROM Table_1
The dataflow gives the following error: Unsupported SQL type '{columnType}' for column 'VARBINARY'
This is because from what I understood from another post in Dojo: you cannot assign NULL values in MySQL to a text column. However, we're currently doing that in another SQL transform in another dataflow!! Why does it run in that dataflow but not in this dataflow I fail to udnerstand! We assign NULL values to a text column in that dataflow
I did a workaround where I started to assign blank values instead of NULL.
SELECT
'' as 'column_x',
'' as 'column_y',
column_z
FROM Table_1
It worked! However I do a COALESCE function in the next transform, such as the following:
COALESCE(column_x, column_y, column_z)
Now because column_x is non-null, it starts to assign column_x values to above. However, It actually should've been null (I only assigned blank to column_x and column_y as a workaround). The true result of above should be column_z
Could someone help me here please?
