https://github.com/dougsland/postgres-by-example

postgres sqls
https://github.com/dougsland/postgres-by-example

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postgres sqls

• Host: GitHub
• URL: https://github.com/dougsland/postgres-by-example
• Owner: dougsland
• Created: 2017-05-18T19:18:13.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2017-06-19T13:46:36.000Z (over 7 years ago)
• Last Synced: 2024-11-18T07:14:09.773Z (about 1 month ago)
• Language: PLpgSQL
• Size: 11.7 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Concepts

database is a collection of tables and functions. A table consists of 

a list of records (rows) with fixed number of fields or columns.

# Keys

Primary keys is a unique key in the table, it is the identifier of record (row).  

Foreign keys 

# postgres-by-example

postgres sqls

$ psql --command  SQLCOMMAND  

Specifies that psql is to execute one command string, command, and then exit.

$ psql --file example.sql  

Use the file filename as the source of commands instead of reading commands interactively.

$ psql -h hostname -p 5432 -d dbname -U username  

  Connect to hostname, port 5432

$ psql -l  

  List all databases

# Meta commands

\password  

  Change password

  postgres=# \password  

\timing  

  Execution timing

  postgres=# \timing  

\h  

  Provides help on specific SQL commands  

  postgres=# \h CREATE

\?  

  Provides help on psql meta-commands

\q  

  Quit

\dv  

  List views

\d view-name  

  Show view definition

# WHERE operators

| Operator | Description                  |

|----------|------------------------------|

| =        | Equality                     |

| <>       | Non Equality                 |

| !=       | Non Equality                 |

| <        | Less than                    |

| <=       | Less than or equal to        |

| >        | Greater than                 |

| >=       | Greator than or equal to     |

| BETWEEN  | Between two specified values |

| IS NULL  | Is a NULL value              |

| ( )      | To group operators, priority |

# Types

**timestamptz**  

Accepted as an abbreviation for timestamp with time zone  

https://www.postgresql.org/docs/9.1/static/datatype-datetime.html

**VARCHAR(N)**

**uuid**

**integer**

# Shell Commands

createdb  

  Create database, wrapper for CREATE DATABASE  

dropdb  

  Drop database, wrapper for DROP DATABASE  

# Graphical administration tools

- pgAdmin3

- phpPgAdmin