fixed comment signs in _psql/*

sheets/_psql/columns

@@ -1,22 +1,22 @@
-# Add column
+-- Add column
 ALTER TABLE <table_name> IF EXISTS
 ADD <column_name> <data_type> [<constraints>];
 
-# Update column
+-- Update column
 ALTER TABLE <table_name> IF EXISTS
 ALTER <column_name> TYPE <data_type> [<constraints>];
 
-# Delete column
+-- Delete column
 ALTER TABLE <table_name> IF EXISTS
 DROP <column_name>;
 
-# Update column to be an auto-incrementing primary key
+-- Update column to be an auto-incrementing primary key
 ALTER TABLE <table_name>
 ADD COLUMN <column_name> SERIAL PRIMARY KEY;
 
-# Insert into a table, with an auto-incrementing primary key
+-- Insert into a table, with an auto-incrementing primary key
 INSERT INTO <table_name>
 VALUES (DEFAULT, <value1>);
-#
+--
 INSERT INTO <table_name> (<column1_name>,<column2_name>)
 VALUES ( <value1>,<value2> );

sheets/_psql/databases

@@ -1,5 +1,5 @@
-# Create a new database
+-- Create a new database
 CREATE DATABASE [IF NOT EXISTS] db_name;
 
-# Delete a database permanently
+-- Delete a database permanently
 DROP DATABASE [IF EXISTS] db_name;

sheets/_psql/indexes

@@ -1,6 +1,6 @@
-# Creating an index with the specified name on a table
+-- Creating an index with the specified name on a table
 CREATE [UNIQUE] INDEX index_name
 ON table (column,...)
 
-# Removing a specified index from table
+-- Removing a specified index from table
 DROP INDEX index_name;

sheets/_psql/performance

@@ -1,8 +1,8 @@
-# Show the query plan for a query
+-- Show the query plan for a query
 EXPLAIN query;
 
-# Show and execute the query plan for a query
+-- Show and execute the query plan for a query
 EXPLAIN ANALYZE query;
 
-# Collect statistics
+-- Collect statistics
 ANALYZE table_name;

sheets/_psql/permissions

@@ -1,20 +1,20 @@
-# Grant all permissions on database
+-- Grant all permissions on database
 GRANT ALL PRIVILEGES ON DATABASE <db_name> TO <user_name>;
 
-# Grant connection permissions on database
+-- Grant connection permissions on database
 GRANT CONNECT ON DATABASE <db_name> TO <user_name>;
 
-# Grant permissions on schema
+-- Grant permissions on schema
 GRANT USAGE ON SCHEMA public TO <user_name>;
 
-# Grant permissions to functions
+-- Grant permissions to functions
 GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA public TO <user_name>;
 
-# Grant permissions to select, update, insert, delete, on a all tables
+-- Grant permissions to select, update, insert, delete, on a all tables
 GRANT SELECT, UPDATE, INSERT ON ALL TABLES IN SCHEMA public TO <user_name>;
 
-# Grant permissions, on a table
+-- Grant permissions, on a table
 GRANT SELECT, UPDATE, INSERT ON <table_name> TO <user_name>;
 
-# Grant permissions, to select, on a table
+-- Grant permissions, to select, on a table
 GRANT SELECT ON ALL TABLES IN SCHEMA public TO <user_name>;

sheets/_psql/roles

@@ -1,11 +1,11 @@
-# Create a new role
+-- Create a new role
 CREATE ROLE role_name;
 
-# Create a new role with a username and password:
+-- Create a new role with a username and password:
 CREATE ROLE username NOINHERIT LOGIN PASSWORD password;
 
-# Change role for current sesion to the new_role:
+-- Change role for current sesion to the new_role:
 SET ROLE new_role;
 
-# Allow role_1 to set its role as role_2:
+-- Allow role_1 to set its role as role_2:
 GRANT role_2 TO role_1;

sheets/_psql/schema

@@ -1,10 +1,10 @@
-# List schemas
+-- List schemas
 \dn
 SELECT schema_name FROM information_schema.schemata;
 SELECT nspname FROM pg_catalog.pg_namespace;
 
-# Create schema
+-- Create schema
 CREATE SCHEMA IF NOT EXISTS <schema_name>;
 
-# Drop schema
+-- Drop schema
 DROP SCHEMA IF EXISTS <schema_name> CASCADE;

sheets/_psql/select

@@ -1,74 +1,74 @@
-# Query all data from a table
+-- Query all data from a table
 SELECT * FROM table_name;
 
 Query data from specified columns of all rows in a table
 SELECT column, column2... FROM table;
 
-# Query data and select only unique rows
+-- Query data and select only unique rows
 SELECT DISTINCT (column) FROM table;
 
-# Query data from a table with a filter
+-- Query data from a table with a filter
 SELECT * FROM table WHERE condition;
 
-# Set an alias for a column in the result set
+-- Set an alias for a column in the result set
 SELECT column_1 AS new_column_1, ...
 FROM table;
 
-# Query data using the LIKE operator
+-- Query data using the LIKE operator
 SELECT * FROM table_name
 WHERE column LIKE '%value%'
 
-# Query data using the BETWEEN operator
+-- Query data using the BETWEEN operator
 SELECT * FROM table_name
 WHERE column BETWEEN low AND high;
 
-# Query data using the IN operator
+-- Query data using the IN operator
 SELECT * FROM table_name
 WHERE column IN (value1, value2,...);
 
-# Constrain the returned rows with LIMIT clause
+-- Constrain the returned rows with LIMIT clause
 SELECT * FROM table_name
 LIMIT limit OFFSET offset
 ORDER BY column_name;
 
-# Query data from multiple using the inner join, left join, full outer join, cross join and natural join:
+-- Query data from multiple using the inner join, left join, full outer join, cross join and natural join:
 SELECT * FROM table1 INNER JOIN table2 ON conditions
 SELECT * FROM table1 LEFT JOIN table2 ON conditions
 SELECT * FROM table1 FULL OUTER JOIN table2 ON conditions
 SELECT * FROM table1 CROSS JOIN table2;
 SELECT * FROM table1 NATURAL JOIN table2;
 
-# Return the number of rows of a table.
+-- Return the number of rows of a table.
 SELECT COUNT (*)
 FROM table_name;
 
-# Sort rows in ascending or descending order
+-- Sort rows in ascending or descending order
 SELECT column, column2, ...
 FROM table
 ORDER BY column ASC [DESC], column2 ASC [DESC],...;
 
-# Group rows using GROUP BY clause.
+-- Group rows using GROUP BY clause.
 SELECT *
 FROM table
 GROUP BY column_1, column_2, ...;
 
-# Filter groups using the HAVING clause.
+-- Filter groups using the HAVING clause.
 SELECT *
 FROM table
 GROUP BY column_1
 HAVING condition;
 
-# Combine the result set of two or more queries with UNION operator:
+-- Combine the result set of two or more queries with UNION operator:
 SELECT * FROM table1
 UNION
 SELECT * FROM table2;
 
-# Minus a result set using EXCEPT operator:
+-- Minus a result set using EXCEPT operator:
 SELECT * FROM table1
 EXCEPT
 SELECT * FROM table2;
 
-# Get intersection of the result sets of two queries:
+-- Get intersection of the result sets of two queries:
 SELECT * FROM table1
 INTERSECT
 SELECT * FROM table2;

sheets/_psql/shell

@@ -1,48 +1,48 @@
-# Connect to a specific database
+-- Connect to a specific database
 \c database_name
 
-# To quite the psql
+-- To quite the psql
 \q
 
-# List all databases in the PostgreSQL database server
+-- List all databases in the PostgreSQL database server
 \l
 
-# List all schemas
+-- List all schemas
 \dn
 
-# List all stored procedures and functions
+-- List all stored procedures and functions
 \df
 
-# List all views
+-- List all views
 \dv
 
-# Lists all tables in a current database
+-- Lists all tables in a current database
 \dt
 
-# Get more information on tables in the current database
+-- Get more information on tables in the current database
 \dt+
 
-# Get detailed information on a table
+-- Get detailed information on a table
 \d+ table_name
 
-# Show a stored procedure or function code
+-- Show a stored procedure or function code
 \df+ function_name
 
-# Show query output in the pretty-format
+-- Show query output in the pretty-format
 \x
 
-# List all users
+-- List all users
 \du
 
-# Export table into CSV file
+-- Export table into CSV file
 \copy <table_name> TO '<file_path>' CSV
 
-# Export table, only specific columns, to CSV file
+-- Export table, only specific columns, to CSV file
 \copy <table_name>(<column_1>,<column_1>,<column_1>) TO '<file_path>' CSV
 
-# Import CSV file into table
+-- Import CSV file into table
 \copy <table_name> FROM '<file_path>' CSV
 
-# Import CSV file into table, only specific columns
+-- Import CSV file into table, only specific columns
 \copy <table_name>(<column_1>,<column_1>,<column_1>) FROM '<file_path>' CSV
 

sheets/_psql/tables

@@ -1,4 +1,4 @@
-# Create a new table or a temporary table
+-- Create a new table or a temporary table
 CREATE [TEMP] TABLE [IF NOT EXISTS] table_name(
    pk SERIAL PRIMARY KEY,
    c1 type(size) NOT NULL,
@@ -6,27 +6,27 @@ CREATE [TEMP] TABLE [IF NOT EXISTS] table_name(
    ...
 );
 
-# Add a new column into a table
+-- Add a new column into a table
 ALTER TABLE table_name ADD COLUMN new_column_name TYPE;
 
-# Drop a column in a table
+-- Drop a column in a table
 ALTER TABLE table_name DROP COLUMN column_name;
 
-# Rename a column
+-- Rename a column
 ALTER TABLE table_name RENAME column_name TO new_column_name;
 
-# Set or remove a default value for a column
+-- Set or remove a default value for a column
 ALTER TABLE table_name ALTER COLUMN [SET DEFAULT value | DROP DEFAULT]
 
-# Add a primary key to a table
+-- Add a primary key to a table
 ALTER TABLE table_name ADD PRIMARY KEY (column,...);
 
-# Remove the primary key from a table
+-- Remove the primary key from a table
 ALTER TABLE table_name 
 DROP CONSTRAINT primary_key_constraint_name;
 
-# Rename a table
+-- Rename a table
 ALTER TABLE table_name RENAME TO new_table_name;
 
-# Drop a table and its dependent objects:
+-- Drop a table and its dependent objects:
 DROP TABLE [IF EXISTS] table_name CASCADE;

sheets/_psql/update

@@ -1,27 +1,27 @@
-# Insert a new row into a table
+-- Insert a new row into a table
 INSERT INTO table(column1,column2,...)
 VALUES(value_1,value_2,...);
 
-# Insert multiple rows into a table
+-- Insert multiple rows into a table
 INSERT INTO table_name(column1,column2,...)
 VALUES(value_1,value_2,...),
       (value_1,value_2,...),
       (value_1,value_2,...)...
 
-# Update data for all rows
+-- Update data for all rows
 UPDATE table_name
 SET column_1 = value_1,
     ...;
 
-# Update data for a set of rows specified by a condition in WHERE clause
+-- Update data for a set of rows specified by a condition in WHERE clause
 UPDATE table
 SET column_1 = value_1,
     ...
 WHERE condition;
 
-# Delete all rows of a table
+-- Delete all rows of a table
 DELETE FROM table_name;
 
-# Delete specific rows based on a condition
+-- Delete specific rows based on a condition
 DELETE FROM table_name
 WHERE condition;

sheets/_psql/users

@@ -1,11 +1,11 @@
-# List roles
+-- List roles
 SELECT rolname FROM pg_roles;
 
-# Create user
+-- Create user
 CREATE USER <user_name> WITH PASSWORD '<password>';
 
-# Drop user
+-- Drop user
 DROP USER IF EXISTS <user_name>;
 
-# Alter user password
+-- Alter user password
 ALTER ROLE <user_name> WITH PASSWORD '<password>';

sheets/_psql/views

@@ -1,25 +1,25 @@
-# Create a view
+-- Create a view
 CREATE OR REPLACE view_name AS
 query;
 
-# Create a recurisve view:
+-- Create a recurisve view:
 CREATE RECURSIVE VIEW view_name(columns) AS
 SELECT columns;
 
-# Create a materialized view:
+-- Create a materialized view:
 CREATE MATERIALIZED VIEW view_name
 AS
 query
 WITH [NO] DATA;
 
-# Refresh a materialized view
+-- Refresh a materialized view
 REFRESH MATERIALIZED VIEW CONCURRENTLY view_name;
 
-# Drop a view
+-- Drop a view
 DROP VIEW [ IF EXISTS ] view_name;
 
-# Drop a materialized view
+-- Drop a materialized view
 DROP MATERIALIZED VIEW view_name;
 
-# Rename a view
+-- Rename a view
 ALTER VIEW view_name RENAME TO new_name;