PostgreSQL query — column does not exist

问题

I am trying to update a table using a temporary table.

  Schema   |         Name         |   Type   |  Owner   
------------+----------------------+----------+----------
 pg_temp_11 | tmp_x                | table    | postgres
 public     | entities             | table    | postgres

---

However I am getting this error:

UPDATE entities SET "Name" = "tmp_x.Name" FROM tmp_x WHERE "entities.Ent_ID" = "tmp_x.Ent_ID";
ERROR:  column "tmp_x.Name" does not exist -- the column Name exists
LINE 1: UPDATE entities SET "Name" = "tmp_x.Name" FROM tmp_x WHERE "...

What is the problem? The quotes around table columns?

回答1:

You are surrounding multiple individual objects with double quotes. If you are using object delimiters (double quotes), they need to be on each item, not on the entire combination:

UPDATE entities SET "Name" = "tmp_x"."Name" FROM tmp_x WHERE "entities"."Ent_ID" = "tmp_x"."Ent_ID";

来源：https://stackoverflow.com/questions/33614625/postgresql-query-column-does-not-exist