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Learn SQL Database Programming

You're reading from  Learn SQL Database Programming

Product type Book
Published in May 2020
Publisher Packt
ISBN-13 9781838984762
Pages 564 pages
Edition 1st Edition
Languages
Author (1):
Josephine Bush Josephine Bush
Profile icon Josephine Bush
Toc

Table of Contents (24) Chapters close

Preface 1. Section 1: Database Fundamentals
2. Introduction to Relational Database Management Systems 3. Installing and Using MySQL Workbench 4. Understanding Data Types 5. Designing and Creating a Database 6. Importing and Exporting Data 7. Section 2: Basic SQL Querying
8. Querying a Single Table 9. Querying Multiple Tables 10. Modifying Data and Table Structures 11. Section 3: Advanced SQL Querying
12. Working with Expressions 13. Grouping and Summarizing Data 14. Advanced Querying Techniques 15. Programmable Objects 16. Section 4: Presenting Your Findings
17. Exploring and Processing Your Data 18. Telling a Story with Your Data 19. Section 5: SQL Best Practices
20. Best Practices for Designing and Querying 21. SQL Appendix 22. Assessments 23. Other Books You May Enjoy

Using the HAVING clause

The HAVING clause is used to filter the GROUP BY results. The following code shows the HAVING syntax, where the WHERE and ORDER BY clauses are optional:

SELECT column(s) 
FROM table
WHERE condition(s)
GROUP BY columns(s)
HAVING condition(s)
ORDER BY column(s);

Learning how to use the HAVING clause to limit query results

Let's say you needed to see the results of running the GROUP BY clause in the previous section, but where the sum of at-bats is greater than 100. This is when you would use a HAVING clause, as shown in the following query:

USE lahmansbaseballdb; 
SELECT playerid, teamid, sum(AB) AS sum_at_bats
FROM batting
GROUP BY playerid, teamid
HAVING sum_at_bats > 100;

The following screenshot...

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