PostgreSQL – Get Database Version

ByAdmin September 2, 2023September 2, 2023

To get the version of your PostgreSQL database, you can use the SQL query below when connected to the database:

SELECT version();

When you run this query, it will return a result similar to the following:

PostgreSQL x.x.x on x86_64-pc-linux-gnu, compiled by ...

In the result, “x.x.x” represents the PostgreSQL version number. It also provides information about the platform and compilation details.

Alternatively, you can use the pg_version system view to retrieve version information programmatically:

SELECT version_num, version() AS full_version FROM pg_catalog.pg_version;

This query will return the version number in a structured format as well as the full version string.

How-To Guides

PostgreSQL – How to Create a User

ByAdmin August 30, 2023August 30, 2023

To create a new user in PostgreSQL, you can use the CREATE USER SQL command. Below is the basic syntax: CREATE USER username [WITH PASSWORD ‘password’]; where username is the desired username for the new user, and [WITH PASSWORD ‘password’] is optional. If you include the password, the user will be created with that password….

How-To Guides

PostgreSQL – How to Extract Date from Timestamp

ByAdmin September 8, 2023September 8, 2023

You can extract date from a timestamp using various functions depending on the specific part of the date you want to extract. Here are some commonly used functions for extracting different parts of a date from a timestamp: Extracting Date Only (Year, Month, and Day):To extract only the date (year, month, and day) from a…

How-To Guides

PostgreSQL – How to Add a NOT NULL Constraint

ByAdmin September 8, 2023September 8, 2023

To add a NOT NULL constraint to an existing column in a PostgreSQL table, you can use the ALTER TABLE statement with the ALTER COLUMN clause. Here’s the basic syntax: ALTER TABLE table_name ALTER COLUMN column_name SET NOT NULL; where table_name is the name of the table you want to modify, and column_name is the…

How-To Guides

PostgreSQL – How to Concatenate Strings

ByAdmin September 5, 2023September 5, 2023

You can concatenate strings using the || operator or the CONCAT() function in PostgreSQL database. Here are examples of both methods: Using the || Operator: The || operator is used to concatenate two or more strings together. SELECT ‘Hello ‘ || ‘World’; You can also concatenate columns from a table: SELECT first_name || ‘ ‘…

How-To Guides

PostgreSQL -How to Drop a NOT NULL Constraint

ByAdmin September 8, 2023September 8, 2023

To drop a NOT NULL constraint from an existing column in a PostgreSQL table, you can use the ALTER TABLE statement with the ALTER COLUMN clause. Here’s the basic syntax: ALTER TABLE table_name ALTER COLUMN column_name DROP NOT NULL; where table_name is the name of the table containing the column and column_name is the name…

How-To Guides

PostgreSQL – How to Alter Default Privileges of A Schema

ByAdmin October 5, 2023October 5, 2023

You can use the ALTER DEFAULT PRIVILEGES statement in PostgreSQL database to set default privileges that will be applied to newly created objects in a schema. This is a powerful way to control access and permissions for objects created by a specific user or role in a particular schema. Here’s the basic syntax for using…

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