To get the name of the current database in PostgreSQL, you can use the following SQL query:
SELECT current_database();When you execute this query, it will return the name of the database that you are currently connected to.
For example, if you are connected to a database named “my_database,” executing the query will return “my_database” as the result.
You can use the json_object_keys function to extract the keys (field names) from a JSON object in PostgreSQL database. This function takes a JSON object as its argument and returns a set of text values representing the keys in the JSON object. Here is the basic syntax for the json_object_keys function: sqlCopy code json_object_keys(json_object) where…
To find duplicate values in a PostgreSQL table, you can use the GROUP BY clause along with the HAVING clause. Here is the syntax: SELECT column_name, COUNT(column_name) AS count FROM your_table GROUP BY column_name HAVING COUNT(column_name) > 1; where your_table is the actual name of your table and column_name is the column for which you…
You can create a sequence using the CREATE SEQUENCE command in PostgreSQL database. A sequence is typically used to generate unique integer values, often for primary keys or other situations where you need a unique identifier. Here’s the basic syntax to create a sequence: CREATE SEQUENCE sequence_name [ INCREMENT increment ] [ MINVALUE min_value ]…
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…
To rename a column in PostgreSQL, you can use the ALTER TABLE statement with the RENAME COLUMN clause. Below is the basic syntax for renaming a column in PostgreSQL: ALTER TABLE table_name RENAME COLUMN old_column_name TO new_column_name; where table_name is the name of the table containing the column you want to rename, old_column_name is the…
To get the first day of the month from a date in PostgreSQL, you can use the DATE_TRUNC function. Here’s an example: SELECT DATE_TRUNC(‘month’, your_date_column) AS first_day_of_month FROM your_table; where your_date_column is the name of your date column and your_table is the name of your table. This query will return the first day of the…