How do I make a table read only in PostgreSQL?

How do I make a table read only in PostgreSQL?

create function do_not_change() returns trigger as $$ begin raise exception ‘Cannot modify table procedure. Contact the system administrator if you want to make this change. ‘; end; $$ language plpgsql; create trigger no_change_trigger before insert or update or delete on “procedure” execute procedure do_not_change();

How do you do a left join in Postgres?

PostgreSQL LEFT JOIN

1. First, specify the columns in both tables from which you want to select data in the SELECT clause.
2. Second, specify the left table (table A ) in the FROM clause.
3. Third, specify the right table (table B ) in the LEFT JOIN clause and the join condition after the ON keyword.

How do I list tables in PostgreSQL?

Summary. Use the \dt or \dt+ command in psql to show tables in a specific database. Use the SELECT statement to query table information from the pg_catalog.

How do I check privileges in PostgreSQL?

Another way to do this is to use the information_schema schema and query the table_privileges table as: $ SELECT * FROM information_schema. table_privileges LIMIT 5; The above query will show detailed information about user privileges on databases as well as tables.

What is a left join in Postgres?

The PostgreSQL LEFT JOIN returns all the rows of the table on the left side of the join and matching rows for the table on the right side of the join. The rows for which there is no matching row on the right side, the result-set will contain null. LEFT JOIN is also known as LEFT OUTER JOIN.

What is the default join in Postgres?

INNER
INNER is the default; LEFT, RIGHT, and FULL imply an outer join. The join condition is specified in the ON or USING clause, or implicitly by the word NATURAL. The join condition determines which rows from the two source tables are considered to “match”, as explained in detail below.

How to make a table read only in PostgreSQL?

Next month when I deploy the next version of the application: — Make the table read-write. insert into procedure (id, name) values (4, ‘Request Visit’); — new proc delete from procedure where id = 2; — remove old unsupported proc — Now, make the table read-only again.

When do you insert data into a table in PostgreSQL?

When you create a new table, it does not have any data. The first thing you often do is to insert new rows into the table. PostgreSQL provides the INSERT statement that allows you to insert one or more rows into a table at a time.

Can a new user create a table in PostgreSQL?

By default new users will have permission to create tables. If you are planning to create a read-only user, this is probably not what you want. To create a true read-only user with PostgreSQL 9.0+, run the following steps:

How to return the inserted row in PostgreSQL?

RETURNING clause The INSERT statement also has an optional RETURNING clause that returns the information of the inserted row. If you want to return the entire inserted row, you use an asterisk (*) after the RETURNING keyword: INSERT INTO table_name (column1, column2, …)