26 December 2020

The newest releases of PostgreSQL are … The RETURNING keyword in PostgreSQL gives you an opportunity to return, from the insert or update statement, the values of any columns after the insert or update was run. Also, the case in which a column name list is omitted, but not all the columns are filled from the VALUES clause or query , is disallowed by the standard. On successful completion, an INSERT command returns a command tag of the form. Furthermore, note that this option requires writing two separate queries, whereas PostgreSQL’s RETURNING clause allows you to return data after an insert with just one query. The count is the number of rows inserted or updated.oid is always 0 (it used to be the OID assigned to the inserted row if count was exactly one and the target table was declared WITH OIDS and 0 otherwise, but creating a table WITH OIDS is not supported anymore). INSERT INTO .. Becuse the queries are executed in the same snapshot, the SELECT will not see the effects of the UPDATE statement. Again, this only works if your IDs form a discrete sequence, which is the case with the SERIAL auto-incrementing integer type. Also how can I return the id if the email was not inserted and it already exist in the DB? RETURNING * -- DB2 SELECT * FROM FINAL TABLE (INSERT INTO ..) Oracle also knows of a similar clause. How can I do this? return newindex; end; Well, the problem is that I want the id of the new post to be saved into the newindex variable for further actions. Outputs. For PostgreSQL 10, I have worked on a feature called “identity columns”. INSERT conforms to the SQL standard, except that the RETURNING clause is a PostgreSQL extension, as is the ability to use WITH with INSERT. Now with DO UPDATE, it is possible to perform operations on the tuple there is a conflict with. I mentioned this in passing in a few of my talks that touch on PostgreSQL recently, and it often gets twitter comment so here's a quick example of the RETURNING keyword in PostgreSQL. Should I do: select id from insert into foo (a,b) values (default,bvalue) returning id;? You can get confusing results that way. INSERT INTO upsert_table VALUES (2, 6, 'upserted') ON CONFLICT DO NOTHING RETURNING *; id | sub_id | status ----+-----+----- (0 rows) Note as well that RETURNING returns nothing, because no tuples have been inserted. Both stored procedures and user-defined functions are created with CREATE FUNCTION statement in PostgreSQL. But how do I catch the value into the variable? The RETURNING syntax is more convenient if you need to use the returned IDs or values … I want to build a function which will insert an email if the email value doesn't exist in the table and return the email_id of the row. Do I need to perform another SELECT? INSERT oid count. The RETURNING keyword in PostgreSQL gives an opportunity to return from the insert or update statement the values of any columns after the insert or update was run. WITH updated AS (UPDATE test SET description = 'test' RETURNING id) SELECT * FROM test WHERE id IN (SELECT id FROM updated); Be careful with selecting from the just modified table. Depesz already wrote a blog post about it and showed that it works pretty much like serial columns: CREATE TABLE test_old ( id serial PRIMARY KEY, payload text ); INSERT INTO test_old (payload) VALUES ('a'), ('b'), ('c') RETURNING *; and CREATE TABLE […] On Postgres and DB2, you can also execute this for INSERT statements: ResultSet rs = statement.executeQuery(); The SQL syntax to fetch a java.sql.ResultSet from an INSERT statement works like this:-- Postgres INSERT INTO .. * PostgreSQL Stored Procedures and Functions - Getting Started To return one or more result sets (cursors in terms of PostgreSQL), you have to use refcursor return type. 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