#3 PostgreSQL - ARRAY_AGG, returns an array of values
This source code demonstrates how to use PostgreSQL's CREATE TEMPORARY TABLE command to create a temporary table called TEMP_employee_m. The table has two columns: employee and department.
Next, the INSERT INTO statement is used to insert data into the TEMP_employee_m table. The data consists of the names of 13 employees and their respective departments. This is a sample dataset that could be used to represent the employee records of a company.
Finally, the SELECT statement is used to retrieve the data from the TEMP_employee_m table. This query groups the data by department using the GROUP BY clause and aggregates the names of all employees in each department into an array using the array_agg function.
This query returns a table with two columns: department and emp. The department column contains the unique departments in the dataset, while the emp column contains an array of all employees in each department.
By using array aggregation, this query makes it easy to see which employees belong to which department, without having to list them individually. This is useful in scenarios where you have large datasets with many employees and departments, and you need to quickly get an overview of the data.
Overall, this code provides an example of how to use temporary tables and array aggregation in PostgreSQL to efficiently manipulate and retrieve data.
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