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Joining Data in SQL
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Understand Data Joining Fundamentals
You will learn how to work with multiple tables in SQL by navigating and extracting data from various tables within a SQL database using various join types, including inner joins, outer joins, and cross joins. With practice, you'll gain the knowledge of how to select the appropriate join method.Explore Advanced Data Manipulation Techniques
Next up, you'll explore set theory principles such as unions, intersects, and except clauses, as well as discover the power of nested queries in SQL. Every step is accompanied by exercises and opportunities to apply the theory and grow your confidence in SQL.Prerequisites
Intermediate SQLCombining Data Vertically
Stacking Rows with UNION
Stack rows from multiple tables into a single unified result, and know when stacking (rather than joining) is the right approach for combining data.
Combining Data Horizontally
Keeping All Rows with LEFT JOIN
Enrich a base table with additional data without losing any rows, and understand when a left join is the right choice — specifically, when not every row in your primary table has a match in the other table.
Keeping Matching Rows with INNER JOIN
Combine only the rows that match across tables, understand how inner joins differ from left joins, and choose between them based on whether unmatched rows matter to your analysis.
Joining on Multiple Columns
Join tables accurately when no single column uniquely identifies matching rows, and recognize the consequences of choosing incorrect join columns.
Complete
Earn Statement of Accomplishment
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FAQs
Is this course suitable for beginners?
Yes, this course is suitable for beginners. The concepts are introduced simply and there are many opportunities to practice throughout.
Who will benefit from this course?
This course is beneficial for anyone who works with databases and wants to become more proficient in SQL. It would be especially beneficial to data scientists, software engineers, business analysts and application programmers.
Will I receive a certificate at the end of the course?
Yes, you will receive a certificate at the end of the course.
Will I learn about semi-joins and anti-joins in this course?
Yes, you will learn about semi-joins and anti-joins in the closing chapter of the course after learning about inner and outer joins.
What is an inner join in SQL?
An inner join is a type of join operation that combines the data from two tables into a single table. The result table will contain only those rows that have a match based on the joined columns.
How will this course help me use set theory in SQL?
This course will help you become familiar with set theory operations in SQL, such as UNION, UNION ALL, INTERSECT and EXCEPT clauses. You will also explore the ways in which set theory operations differ from join operations.
What types of joins will I learn in this course?
In this course, you will learn about inner joins, outer joins, cross joins, and self-joins.
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