Andrus. From: Andreas 'ads' Scherbaum To: pgsql-patches(at)postgresql(dot)org: Subject: create language ... if not exists: Date: Loading an extension essentially amounts to running the extension's script file. PostgreSQL 9.4 introduced to_regclass to check object presence very efficiently. Temporary views exist in a special schema, so a schema name cannot be given when creating a temporary view. Index names in PostgreSQL. PostgreSQL did not check the view-defining conditions of the base views. And you cannot execute dynamic DDL statements in plain SQL. Index names cannot be the same as any other index, (foreign) table, (materialized) view, sequence or user-defined composite type in the same schema. Introduction to PostgreSQL Views. How to Create PostgreSQL View? You can check, if an index with a given name does exist by this statement. CREATE EXTENSION loads a new extension into the current database. There is no IF NOT EXISTS clause for CREATE ROLE with CREATE TABLE and you cannot execute dynamic DDL statements in plain SQL. Your request to "avoid PL/pgSQL" is impossible except by using another PL. Request to "avoid PL/pgSQL" is impossible except by using another PL. The PostgreSQL views are created using the CREATE VIEW statement. Unlike, for instance, with CREATE TABLE there is no IF NOT EXISTS clause for CREATE ROLE (up to at least pg 12). CREATE TRIGGER mycheck_trigger BEFORE INSERT OR UPDATE ON mytbl FOR EACH ROW EXECUTE PROCEDURE mycheck_pkey(); aborts transaction if trigger already exists. The view is not physically materialized. Use the CASCADE option to remove a view … -----(end of broadcast)----- TIP 1: if posting/reading through Usenet, please send an appropriate … Index names are unique across a single database schema. Otherwise, it is created in the current schema. Use the IF EXISTS option to remove a view if it exists. In these articles, we will learn about PostgreSQL Views. Creating Views. You can check other below options as well. SELECT count(*) > 0 FROM pg_class c WHERE c.relname = 'some_table_some_field_idx' AND c.relkind = 'i'; Starting from Postgres 9.5 you can even use. CREATE VIEW defines a view of a query. CREATE INDEX IF NOT EXISTS For checking the existence of table is a ubiquitous requirement for PostgreSQL Database Developer. If your index name is some_table_some_field_idx. However, you can create a RULE to correct this problem of using DELETE, INSERT or UPDATE on a view. The script will typically create new SQL objects such as functions, data types, operators and index support methods. There in no CREATE OR REPLACE TRIGGER command in PostgreSQL How to create trigger only when it does not exist ? And you cannot execute dynamic DDL statements in plain SQL. Use the DROP VIEW statement to remove one or more views from the database. 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