How do I use CTE instead of temp table?

How do I use CTE instead of temp table?

As far as when to use each, they have very different use cases. If you will have a very large result set, or need to refer to it more than once, put it in a #temp table. If it needs to be recursive, is disposable, or is just to simplify something logically, a CTE is preferred.

Can Postgres create temp table?

PostgreSQL automatically drops the temporary tables at the end of a session or a transaction. To create a temporary table, you use the CREATE TEMPORARY TABLE statement. Second, specify the column list, which is the same as the one in the CREATE TABLE statement.

How to create a table in PL / pgSQL?

SELECT INTO works in SQL but not PL/pgSQL. This statement creates a table called mytable (If orig_table exists as a relation): But put this function into PostgreSQL, and you get the error: ERROR: “temp” is not a known variable

When to create a temporary table in PostgreSQL?

A temporary table, as its named implied, is a short-lived table that exists for the duration of a database session. PostgreSQL automatically drops the temporary tables at the end of a session or a transaction. To create a temporary table, you use the CREATE TEMPORARY TABLE statement.

How to create a table in PostgreSQL select into?

SELECT INTO is really simple – automatically creating a table of the same structure of the SELECT query. Does anyone have any explanation for why this doesn’t work inside a function? It seems like SELECT INTO works differently in PL/pgSQL, because you can select into the variables you’ve declared.

Can a temporary table be used with a permanent table?

A temporary table can share the same name with a permanent table, even though it is not recommended. When you create a temporary table that shares the same name with a permanent table, you cannot access the permanent table until the temporary table is removed.