Why is it not possible to alter a view with a CREATE OR REPLACE
It s an implementation limitation It s theoretically possible of course but nobody s written the code to handle it yet To cope with column removals or type changes PostgreSQL would have to scan every view that references the view being modified using pg catalog pg depend to see if any of them relied on the column It d also need to look for whole row references and disallow changes in
41 4 Rules on INSERT UPDATE and DELETE PostgreSQL, Cooperation with Views Rules that are defined on INSERT UPDATE and DELETE are significantly different from the view rules described in the previous sections First their CREATE RULE command allows more They are allowed to have no action They can have multiple actions They can be INSTEAD or ALSO the default
PostgreSQL Documentation 16 CREATE FUNCTION
Description CREATE FUNCTION defines a new function CREATE OR REPLACE FUNCTION will either create a new function or replace an existing definition To be able to define a function the user must have the USAGE privilege on the language If a schema name is included then the function is created in the specified schema
CREATE POLICY PostgreSQL 12 Documentation TypeError, The CREATE POLICY command defines a new row level security policy for a table Note that row level security must be enabled on the table using ALTER TABLE ENABLE ROW LEVEL SECURITY in order for created policies to be applied A policy grants the permission to select insert update or delete rows that match the relevant policy expression
PostgreSQL Documentation 16 CREATE TABLE
PostgreSQL Documentation 16 CREATE TABLE, CREATE TABLE will create a new initially empty table in the current database The table will be owned by the user issuing the command If a schema name is given for example CREATE TABLE myschema mytable then the table is created in the specified schema Otherwise it is created in the current schema
Create Or Replace Table Stmt From PostGres To SQL Converts Date Into
PostgreSQL Documentation 12 ALTER POLICY Postgres Professional
PostgreSQL Documentation 12 ALTER POLICY Postgres Professional Description ALTER POLICY changes the definition of an existing row level security policy Note that ALTER POLICY only allows the set of roles to which the policy applies and the USING and WITH CHECK expressions to be modified To change other properties of a policy such as the command to which it applies or whether it is permissive or restrictive the policy must be dropped and recreated
PostgreSQL CRUD Operation Knoldus Blogs
In this article I will discuss CREATE OR REPLACE TRIGGER which was committed for PostgreSQL 14 explaining why this feature was proposed and how the code was improved through discussion in the community Background CREATE OR REPLACE TRIGGER and Oracle compatibility PostgreSQL 13 only supported CREATE TRIGGER which defines a trigger that will run the specified function when the Extending CREATE TRIGGER syntax with OR REPLACE in PostgreSQL code base. The query What s more rules break very useful thing that is returning clause To wrap it if you really really positively have to use writable views and you re using pre 9 1 PostgreSQL you have a valid reason to use rules In all other cases you re most likely shooting yourself in a foot even if you don t immediately see it To reproduce the issue which exists as of this writing in PostgreSQL 10 2 let s create a policy that restricts the user from being set to certain full name based on a list Similar to populating the data set I generated a random list of 1000 names to create the policy As the postgres user try running the following code note the code is
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