postgres=# select * from pg_stat_replication ; pid  | usesysid | usename | application_name |  client_addr  | client_hostname | client_port |         backend_start         | backend_xmin |   stat, e   | sent_location | write_location | flush_location | replay_location | sync_priority | sync_state, ------+----------+---------+------------------+---------------+-----------------+-------------+-------------------------------+--------------+-------, ----+---------------+----------------+----------------+-----------------+---------------+------------, 2297 |    24522 | replica | walreceiver      | 192.168.16.53 |                 |       49782 | 2017-08-15 00:45:43.256404-04 |    149384444 | stream, ing | 111/BD9D5328  | 111/BD9D5328   | 111/BD9D5328   | 111/BD9D52F0    |             0 | async. A name must start with a letter or an underscore; the rest of … Every table has a name, every column has a name, and so on. ... Fixed-width (mono-spaced) font is used for terms that must be given literally such as SQL commands, specific table and column names used in the examples, programming language keywords, etc. Let’s address consistency between variables in our code and field (column) names in our database. Naming conventions for column names: Date: 2017-11-06 10:33:25: ... Is there any reason to keep column names as usesysid and senate instead of usersysid and username ? I believe these naming conventions will be at two levels: 1. Notes about Postgres Naming Conventions. So that we can use those newly added naming conventions in system views as well. In this post I'll be going into the latter. PostgreSQL Column Alias. When a UNIQUE constraint is adding, an index on a column or group of columns creates automatically. But then I think we can do below things: 1. (I am not ordering to anyone here, just putting my thoughts). This chapter covers the basic operation of PostgreSQL, including naming conventions, creating a database, and indexing. On Mon, Nov 6, 2017 at 6:21 PM, Peter Eisentraut. Every table has a name, every column has a name, and so on. In SQL Server, case sensitivity doesn't matter for column names, so if a column is named FirstName, then firstName, firstname, or even FIRSTNAME are all valid. While several facets of naming an object deserve consideration, in this article we’ll focus on the most important one: defining a convention and sticking to it. For example, in SQL Server we may have a table like so: PostgreSQL stores all table and columns (that are not in double quotes) in lowercase, so the above would be stored as product rather than Product, if you run a select with uppercase against Postgres, the query will fail saying the column doesn’t exist. When building a simple or complex application, whether you are designing a PostgreSQL database and/or writing the code that accesses that database, clarity is important and promotes efficiency. The type names are usually also identifiers, but there are some exceptions. It is better to use full names to those columns, so that Users can easily understand those columns by their names. The above would become: While it is possible to use the convention from SQL Server, if you're looking at the table and column information from the database you will find it is stored in lowercase, this often makes it harder to read later. If truncating a column name would result in identical names, SAS generates a unique name by replacing the last character with a number. For example, naming “i age” with an “i ” at the beginning of the variable name to mean “integer”, “t variable” with a “t ” prefix to designate it as “text”, and “tbl_” before table names in order to easily distinguish them as tables. 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