Data Cleaning with SQL String Functions | Clean Messy Text Data (Beginner)

Description:
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In this beginner-friendly SQL workshop, you’ll clean a messy customer dataset using powerful string functions.

You’ll learn how to remove extra spaces with TRIM, standardize text case with UPPER and LOWER, replace broken values with REPLACE, and slice fields with SUBSTRING. Then we’ll combine strings with CONCAT, measure text using LENGTH, safely handle NULL values with COALESCE, and locate patterns using POSITION or STRPOS. Finally, you’ll get a wow moment using REGEXP_REPLACE for regex-based cleanups that fix entire columns in a single query.

This session is ideal for students, career switchers, and junior analysts who want hands-on SQL data cleaning practice for projects and portfolios.

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