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…

To list all the tables in a PostgreSQL database, you can query the information_schema database which contains metadata about all the tables and other objects in the database. Below is the SQL query you can use to show all the tables: SELECT table_name FROM information_schema.tables WHERE table_schema = ‘public’; This query will retrieve the names…

You can convert a string to a date using the TO_DATE function in PostgreSQL. This function allows you to specify the input string, the format of the string, and it will return a date accordingly. The general syntax of the TO_DATE function is as follows: TO_DATE(input_string, format_string) Here’s an example of using SELECT TO_DATE(‘2023-08-31’, ‘YYYY-MM-DD’);…

You can convert a timestamp to a date in PostgreSQL using the DATE function. If you have a timestamp column named “order_ts” in a table called “orders,” you can use the following query to convert the timestamp to a date: SELECT DATE(order_ts) FROM orders; This will return a result set where each row contains the…

Below is the syntax to create a table in PostgreSQL. CREATE TABLE table_name ( column1 datatype1, column2 datatype2, … ); where table_name is the name you want to give to the new table. and column1, column2, etc.: specifies the names of the columns you want to create in the table. and datatype1, datatype2, etc.: specifies…

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);…