PostgreSQL functions have an in-built function to perform manipulation on data. All SQL database systems have data definition Language and data manipulation language tools to assist in creating and maintaining the database.
PostgreSQL Statement COUNT() Syntax example
The PostgreSQL COUNT() function is used to count the number of rows based on specific criteria.
The PostgreSQL AVG() function is used to calculate the average value of numbers
The PostgreSQL SUM() function is used to find the sum of numerical data in a column
PostgreSQL Count() function is used to find the number of items in a column, NULL Values are not included during manipulation
PostgreSQL AVG() function is used to find the average price of all products. when using the AVG() function usually the NULL values are not included
PostgreSQL SUM() function SQL Statement is used to find the Sum of the Quantity fields in the table.NULL values are not included in the sum
These functions in PostgreSQL Usually Assist Us when doing analytics so as to get clean and accurate Data. The manipulated data can then be consumed on visualization tools such as PowerBI and Qlik senses BI