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