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From: Tim Landscheidt <tim@tim-landscheidt.de>
To: pgsql-sql@postgresql.org
Subject: Re: find all views depend on a schema/table
Date: Mon, 27 Jan 2014 04:42:06 +0000
Message-ID: <87k3dmrq75.fsf@passepartout.tim-landscheidt.de> (raw)
References: <52E28D0D.3080908@encs.concordia.ca>
	<13660.1390580600@sss.pgh.pa.us>
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Tom Lane <tgl@sss.pgh.pa.us> wrote:

>> Is there a simple way to query all views depend on a schema or table?

> Well, you could build something that examines pg_depend, or you could
> try this:

> begin;
> drop table some_table restrict;
> ... note what it complains about ...
> rollback;

Note that neither show dependencies that are "hidden" in
functions, i. e.:

| tim=# CREATE TABLE T (ID INT PRIMARY KEY);
| NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "t_pkey" for table "t"
| CREATE TABLE
| tim=# CREATE FUNCTION F() RETURNS INT AS 'SELECT MIN(ID) FROM T;' LANGUAGE SQL;
| CREATE FUNCTION
| tim=# CREATE VIEW V AS SELECT F();
| CREATE VIEW
| tim=# DROP TABLE T;
| DROP TABLE
| tim=# SELECT * FROM V;
| ERROR:  relation "t" does not exist
| LINE 1: SELECT MIN(ID) FROM T;
|                             ^
| QUERY:  SELECT MIN(ID) FROM T;
| CONTEXT:  SQL function "f" during inlining
| tim=#

Tim



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