What’s the difference between CHAR and VARCHAR in MySQL?

CHAR fixed-pads to length (fast but wasteful). VARCHAR stores variable (space-saver, near-identical speed now).

When should I use DECIMAL over FLOAT in MySQL?

Always for money or precision—FLOAT rounds, DECIMAL doesn't.

Can MySQL LONGTEXT really hold 4GB?

Yes, but your server might choke—use external storage.

MySQL Data Types: The Basics That Trip Up Every New Dev

Slap the wrong data type on your MySQL column, and watch your app crawl. Here's the no-BS guide to strings, numbers, dates, and blobs that actually keeps your data sane.

theAIcatchup Apr 10, 2026 3 min read

Infographic comparing MySQL CHAR, VARCHAR, INT, TEXT, and BLOB data types with storage sizes

⚡ Key Takeaways

Pick CHAR for fixed strings, VARCHAR for variable to save space and speed queries. 𝕏
Always use DECIMAL for money—floats will round and ruin you. 𝕏
TEXT and BLOB go outside tables; index prefixes only, never the whole thing. 𝕏

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#CHAR vs VARCHAR #MySQL data types #SQL basics #SQL data types #SQL storage optimization #database best practices #database design #database optimization #database schema

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