Join Tables with Different Data Types in SQL | SQL Tutorial 2024

In this video, you will learn how to join tables in SQL when the data type of the common column is different. This is a common scenario that can cause errors if not handled properly. You will see how to use type conversion to solve this problem in PostgreSQL. This is a useful skill for any SQL developer or data analyst. Watch this video to learn more and subscribe to my channel for more SQL tutorials.
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[Rebellionrider]

🔍 Ever wondered if you can join tables with different data types? 🤔

In Oracle, it might work thanks to implicit conversions, like in our example where we joined Employee and Company tables on **`emp_id`** with Number and Varchar types.

🔄 While it works here, keep in mind that relying on implicit conversions can have performance implications.

It's a good practice to use consistent data types for clearer and more reliable SQL queries.

A better approach involves explicit conversion. Here's how you can do it in the Oracle Database.

SELECT *
FROM Employee e
JOIN Company c ON e.emp_id = TO_NUMBER(c.emp_id);

Give it a shot and let me know how it goes! 👩‍💻🚀 Happy coding! 💻

[hoperight]

A helpful shortcut. I knew we use :: but I generally use it in alter statement. Didn’t know this way of using it. Appreciate

[blender_wiki]

Easy Data type concersion is on of the reason why postgres is a superior sql