Seeing that an earlier, related passage in the text reads:
> Note that the effects of all per-row BEFORE INSERT triggers are reflected
in excluded values, ...
I update my suggestion to use the same expression:
Insert a distributor, or do nothing if the proposed row conflicts with an
existing row
Added a missing word:
Insert a distributor, or do nothing if the proposed row conflicts with an
existing row. Per-row triggers BEFORE INSERT are fired, and possible
effects on the proposed row applied, before checking for conflicts. Example
assumes a unique index on the did column exists:
Regards
https://www.postgresql.org/docs/devel/sql-insert.html#id-1.9.3.152.9
Insert a distributor, or do nothing for rows proposed for insertion when an
> existing, excluded row (a row with a matching constrained column or columns
> after before row insert triggers fire) exists. Example assumes a unique
>
