How to compare two text in SQL?
How to compare two text in SQL?
Ask by Ashutosh Patel
Updated 03 Mar 2025
SQL has multiple text comparison tools and functions to test string matches in database content. You can easily perform text matches with the standard = symbol. You can make text comparisons case-insensitive by using functions such as LOWER() or UPPER() before the evaluation.
To recognize partial matches you can use the LIKE operator with wildcards in SQL. The percentage symbol means any string length while an underscore matches one character. The pattern text% in the WHERE clause matches all values that begin with text.
When detecting text similarity or phonetic proximity the SOUNDEX() and DIFFERENCE() functions in Microsoft SQL Server help users find matching results. The LEVENSHTEIN() database function lets users measure how many edits it takes to change one text value into another through text matching.
You can compare text columns using
CASEorIFstatements to examine if their data matches and generate a specific result for each occurrence.When you optimize query performance make sure to compare directly the indexed columns without using functions like LOWER because these functions decrease execution speed. Every database offers unique string comparison methods for specific uses that require selection based on your specific needs.