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