Why is the column reference ambiguous in PostgreSQL?
Ambiguous column references are due to there being more than one column available of the same name. In this case I guess it’s a quirk of returning a table. Try changing the query to: This will disambiguate the column reference.
Is there an ID field for select in PostgreSQL?
Thanks. I suppose your p2vg table has also an id field , in that case , postgres cannot find if the id in the SELECT refers to vg or p2vg. In Postgresql you can use just one table and any other columns you want like this.
Can you use more than one column in PostgreSQL?
In Postgresql you can use just one table and any other columns you want like this. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.
How to create or replace a table in PostgreSQL?
CREATE OR REPLACE FUNCTION try (_group text) RETURNS TABLE (person integer) AS $$ DECLARE _init_id integer; _record integer; BEGIN SELECT id INTO _init_id FROM egroups WHERE name = _group; FOR _record in SELECT person FROM egroupdata WHERE egroup IN (SELECT recurse (_init_id)) LOOP RETURN NEXT; END LOOP; END; $$ language plpgsql stable;
What does Ambiguous Name column mean in SQL?
Run the query below: If you run the above query, you will get this error — “Ambiguous name column”. This means two columns have the same column name — that is the “Name” column. The SQL Machine is confused as to which “Name” out of the two tables you are referring to. It is ambiguous — not clear. To clarify this, add the alias
How are common table expressions used in PostgreSQL?
WITH provides a way to write auxiliary statements for use in a larger query. These statements, which are often referred to as Common Table Expressions or CTE s, can be thought of as defining temporary tables that exist just for one query. Each auxiliary statement in a WITH clause can be a SELECT, INSERT, UPDATE, or DELETE; and the WITH clause
What are the names of the columns in Table1?
TABLE1 contains these columns — EmployeeID, Name, Salary. TABLE2 has these columns — EmployeeID, Name, Age. First, let’s create the tables. Note that the two tables have a “Name” column in common apart from the EmployeeID — which is always a number.