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 add Column to a Table

ByAdmin August 30, 2023August 30, 2023

To add a new column to an existing table in PostgreSQL, you can use the ALTER TABLE statement. Below is the basic syntax of adding a new column: ALTER TABLE table_name ADD COLUMN new_column_name data_type; where table_name is the name of the table to which you want to add the new column. new_column_name is the…

How-To Guides

PostgreSQL – How to Get Current and Next Values of Sequence

ByAdmin September 5, 2023September 5, 2023

You can use Sequences to generate unique integer values, often used as auto-incrementing primary keys in tables. You can obtain the current value and the next value of a sequence using the currval and nextval functions, respectively. These functions are typically used within SQL statements or in PL/pgSQL code. Current Value (currval): To get the…

How-To Guides

PostgreSQL – How to Drop All Tables of a Schema

ByAdmin October 5, 2023October 5, 2023

To drop all tables in a PostgreSQL schema, you can use SQL queries or a combination of SQL queries and shell scripting. SELECT ‘DROP TABLE IF EXISTS “‘ || schemaname || ‘”.”‘ || tablename || ‘” CASCADE;’ FROM pg_tables WHERE schemaname = ‘your_schema_name’;

How-To Guides

PostgreSQL – How to Refresh a Materialized View

ByAdmin September 14, 2023September 14, 2023

You can refresh the data in a materialized view using the REFRESH MATERIALIZED VIEW statement in PostgreSQL database. A materialized view stores a snapshot of the data from the underlying tables, and this data can become stale over time. The REFRESH MATERIALIZED VIEW command allows you to update the materialized view with the latest data…

How-To Guides

PostgreSQL – How to Drop A Column

ByAdmin September 5, 2023September 5, 2023

To drop a column in PostgreSQL, you can use the ALTER TABLE statement with the DROP COLUMN clause. Here’s the basic syntax for dropping a column: ALTER TABLE table_name DROP COLUMN column_name; where table_name is the name of the table from which you want to drop the column, and column_name is the name of the…

How-To Guides

PostgreSQL – How to Add a Unique Constraint

ByAdmin August 30, 2023August 30, 2023

You can add a unique constraint to a table column using the ALTER TABLE statement. A unique constraint ensures that all values in a column are unique, meaning no two rows can have the same value in that column. Below is the syntax add a unique constraint: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE (column_name);…

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