completed till Storing Arrays

Author: ptyadana

Complete SQL & Databases - ZTM/07_Database_Management.sql

@@ -39,3 +39,121 @@ CREATE DATABASE ZTM;
 CREATE SCHEMA Sales;
 
 
+/*--------------------------------------------------------------------------------------------------------------*/
+
+/*********** 9) Creating Role **************/
+CREATE ROLE readonly WITH LOGIN ENCRYPTED PASSWORD 'readonly';
+
+-- to check all avaliable roles
+>> \du
+
+/*
+By default, when you create a new database - only Superuser and creater of the db can access to it. Other users must be given access to it, if required.
+*/
+
+/************ 10) Creating users and Configuring Login *************/
+
+-- create role and user
+CREATE ROLE test_role_with_login WITH LOGIN ENCRYPTED PASSWORD 'password';
+
+CREATE USER test_user_with_login WITH ENCRYPTED PASSWORD 'password';
+
+\du
+
+/************ Another way of creating user *********/
+-- if you are not connected with postgre, there is binary command that we can use, just follow on screen questions.
+createuser --interactive 
+
+/******* Altering Role *********/
+AlTER ROLE test_interactive WITH ENCRYPTED PASSWORD 'password';
+
+/*--------------------------------------------------------------------------------------------------------------*/
+
+/******** Checking hba and config file location *****/
+-- login with root user
+SHOW hba_file;
+SHOW config_file;
+
+/*--------------------------------------------------------------------------------------------------------------*/
+
+/******** 11/12) Privileges *********/
+GRANT ALL PRIVILEGES ON <table> TO <user>;
+GRANT ALL ON ALL TABLES [IN SCHEMA <schema>] TO <user>;
+GRANT [SELECT, UPDATE, INSERT, ...] ON <table> [IN SCHEMA <schema>] TO <user>;
+
+-- grant select to our test user
+GRANT SELECT ON titles TO test_user_with_login;
+
+-- revoke privileges from test user
+REVOKE SELECT ON titles FROM test_user_with_login;
+
+-- Grant all access
+GRANT ALL ON ALL TABLES IN SCHEMA public TO test_user_with_login;
+
+-- Revoke all access
+REVOKE ALL ON ALL TABLES IN SCHEMA public TO test_user_with_login;
+
+-- Create a role with privileges and grant that role a specific user
+CREATE ROLE employee_read;
+GRANT SELECT ON ALL TABLES IN SCHEMA public TO employee_read;
+GRANT employee_read TO test_user_with_login;
+GRANT employee_read TO test_user_with_login;
+REVOKE employee_read FROM test_user_with_login;
+
+
+/*--------------------------------------------------------------------------------------------------------------*/
+
+/******** 13) Best Practices For Role Management *********/
+
+/*
+	When managing Roles and Permissions, always go with the "Principle Of Least Privilege".
+	Give no Privilege at all at first. Then stack on privileges as required.
+	
+	Don't use Super/Admin by default.
+	
+*/
+
+/*--------------------------------------------------------------------------------------------------------------*/
+
+/************ 15) Storing Texts **********/
+CREATE TABLE test(
+	fixed char(4),
+	variable varchar(20),
+	unlimited text
+);
+
+INSERT INTO test VALUES(
+	'abcd',
+	'efghijklm',
+	'This is super unlimited'
+);
+
+
+/************ 16) Storing Numbers **********/
+
+CREATE TABLE test(
+	four float4,
+	eight float8,
+	big decimal
+);
+
+INSERT INTO test VALUES(
+	1.123456789,
+	1.123456789123456789,
+	1.123456789123456789123456789123456789123456789123456789
+);
+
+/************ 17) Storing Arrays **********/
+CREATE TABLE test(
+	four char(2)[],
+	eight text[],
+	big float64[]
+);
+
+INSERT INTO test VALUES(
+	ARRAY['ab', 'cd', 'ef'],
+	ARRAY['test', 'sunny', 'goblin'],
+	ARRAY[1.23, 3.45, 6.78, 9.2345234]
+);
+
+/*--------------------------------------------------------------------------------------------------------------*/