January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Returning voids
A void type is used in a function to perform some side effects, such as logging; the built-in function, pg_sleep, is used to delay the execution of a server process, in seconds, as follows:
postgres=# \df pg_sleep List of functions Schema | Name | Result data type | Argument data types | Type ------------+----------+------------------+---------------------+-------- pg_catalog | pg_sleep | void | double precision | normal(1 row)
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