Postgresql return query example
PostgreSQL Documentation; Prev: Fast Backward: Chapter 34. Extending SQL: If the last query happens to return no rows at all, the null value will be returned. In this case each row returned by the function becomes a row of the table seen by the query. For example, assume that table foo has the same contents as above, andReturn a record with PLpgSQL function to speed up the query. which uses acync queries to write player stats into a PostgreSQL 9. 3 database. But when I need to read something from database (like if a player is banned or if the player has a VIP status), then I use synchronous queries. Then you should define return type of the function postgresql return query example
The PostgreSQL EXCEPT operator is used to return all rows in the first SELECT statement that are not returned by the second SELECT statement. Each SELECT statement will define a dataset. The EXCEPT operator will retrieve all records from the first dataset and then remove from the results all records from the second dataset. Except Query
By Example PostgreSQL Functions By Example Joe Conway credativ Group January 20, 2012 Return If singleton, rst row of last query result returned, NULL on no result If SETOF, all rows of last query result returned, empty set on PostgreSQL Tablequalify columns of the same name to avoid conflicts or unexpected results. I did that for all columns in my example. But note the potential naming conflict between the OUT parameter cnt and the column alias of the same name. In this particular case (RETURN QUERY SELECT ) Postgres uses the column alias over the OUT parameter either way. This can be ambiguous in other contexts, though.postgresql return query example RETURN NEXT and RETURN QUERY do not actually return from the function they simply append zero or more rows to the function's result set. Execution then continues with the next statement in the PLpgSQL function.