Performing Data Aggregation using SQL Aggregate Functions

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在此指導項目中,您將:

Retrieve data as summaries from tables of a database using SQL aggregate functions

Understand how to set conditions on the result set of an aggregate functions using the HAVING clause

Clock2 hours
Intermediate中級
Cloud無需下載
Video分屏視頻
Comment Dots英語(English)
Laptop僅限桌面

In this 2-hour long project-based course, you will learn how to retrieve data from tables in a database using SQL SELECT statement with SQL Aggregate functions. The aggregate functions we will consider in this project are COUNT, SUM, MIN, MAX and AVG. Aggregate functions are used to summarize data from rows of a table into a single value. In addition, you will learn how to set conditions on the output of an aggregate function using the HAVING clause. Finally, you will learn how to tidy up the result set of aggregate functions using the ROUND function. Note: You do not need to be a data administrator or data analyst to be successful in this guided project, just a familiarity with querying databases using SQL SELECT statement suffice for this project. If you are not familiar with SQL and want to learn the basics, start with my previous guided projects titled “Performing Data definition and Manipulation in SQL." and “Querying Databases using SQL SELECT statement”

您要培養的技能

  • Data Management
  • Data Manipulation
  • Relational Database
  • Postgresql
  • Data Aggregation

分步進行學習

在與您的工作區一起在分屏中播放的視頻中,您的授課教師將指導您完成每個步驟:

  1. Retrieve data from the employees database

  2. Retrieve data from the employees database using the COUNT function

  3. Select distinct data from fields of a table and use the GROUP BY statement

  4. Use the HAVING clause to set conditions on aggregate functions

  5. Retrieve data from the employees database using the SUM function

  6. Retrieve data from the employees database using the MIN & MAX functions

  7. Retrieve data from the employees database using the AVG function

  8. Use ROUND to tidy up the result set of aggregate functions

指導項目工作原理

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