An “upsert” operation refers to the ability to update an existing row if it exists, or insert a new row if it doesn’t exist, based on a specified condition. The upsert operation is also known as “merge” or “insert on conflict update.” INSERT INTO target_table (column1, column2, …) VALUES (value1, value2, …) ON CONFLICT (unique_constraint_columns)…

You can insert multiple rows into a table using the INSERT INTO statement in PostgreSQL database. There are a few different ways to accomplish this, depending on your requirements and the format of the data you want to insert. The two common methods of inserting multiple values are: using the VALUES clause and using the…

In PostgreSQL, the TRUNCATE command is used to remove all data from a table while preserving the structure of the table. TRUNCATE statement is faster than the DELETE statement to delete all the rows of a table. Below is the syntax of the TRUNCATE command: TRUNCATE TABLE table_name; In the above command table_name is the…

To add a new column to a table in PostgreSQL, you can use the ALTER TABLE statement with the ADD COLUMN clause. Syntax is as shown below: ALTER TABLE table_name ADD COLUMN column_name data_type [column_constraints]; Where: Below is an example to add a new column “email” of data type varchar(255) to a table “users”. ALTER…

The PostgreSQL UPDATE statement can be used to modify existing records in a table. The basic syntax of the UPDATE statement is as follows: UPDATE table_name SET column1 = value1, column2 = value2, … WHERE conditions; Below is an example to demonstrates the usage of the UPDATE statement: Consider a table named “employees” with the…

To insert data into a table in PostgreSQL, you can use the INSERT statement. Below is the syntax: INSERT INTO table_name (column1, column2, column3, …) VALUES (value1, value2, value3, …); Below is an example of inserting data into a table named “employees” with columns “id”, “name”, and “age”: INSERT INTO employees (name, department, salary) VALUES…