I have been using LISTAGG to group a bunch of records together to be presented in a single HTML table cell. Problem is LISTAGG doesn’t do anything with null field values. As such, the data doesn’t line up across columns. The three ID values have two string values, which basically get centered in the cell. You cannot tell which ID value goes to which name value.
By adding a concatenation to the LISTAGG value, something will be included in the result set even when the record value is null.
Voila — records line up and I can tell the first ID doesn’t have an associated string value.