To get the size of a specific table in PostgreSQL, you can use the pg_total_relation_size function. This function returns the total size of a table in bytes, including the main data file, indexes, and associated objects. Below is the syntax: SELECT pg_size_pretty(pg_total_relation_size(‘your_table_name’)); where ‘your_table_name’ with the name of the table you want to get the…

To retrieve a list of all schemas in a PostgreSQL database, you can use the following SQL query: SELECT schema_name FROM information_schema.schemata; This query queries the information_schema.schemata view, which contains information about all the schemas in the current database. When you execute this query, it will return a list of schema names present in the…

To describe a table in PostgreSQL and retrieve information about its columns and data types, you can use the \d command in the psql command-line tool or execute a SQL query. Here are two common methods to describe a table: Method 1: Using \d in psql (Command-Line Tool): Open a terminal and start the psql…

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…

The gen_random_uuid() function is used to generate a random UUID (Universally Unique Identifier) in PostgreSQL database. UUIDs are 128-bit identifiers that are often used as unique keys in database tables or for generating random values. Here’s how you can use gen_random_uuid() to generate a random UUID in PostgreSQL: SELECT gen_random_uuid(); When you execute above SQL…

You can change the owner of a schema in PostgreSQL database using the ALTER SCHEMA statement with the OWNER TO clause. Below is the syntax: ALTER SCHEMA schema_name OWNER TO new_owner; where schema_name is the name of the schema for which you want to change the owner, and new_owner is the name of the new…

You can rename a schema in PostgreSQL using the ALTER SCHEMA statement. Below is the syntax for renaming a schema: ALTER SCHEMA old_schema_name RENAME TO new_schema_name; where old_schema_name is the name of the schema you want to rename and new_schema_name is the new name you want to assign to the schema. Ensure you have the…

To delete the data from a table in PostgreSQL, you can use the DELETE statement without a WHERE clause. This will remove all rows from the table, effectively emptying it. Below is the basic syntax: DELETE FROM table_name; where table_name is the name of the table you want to delete the data from. After running…