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107. Collation

Understand how collation controls text comparison and sorting behavior.

📘 Lesson 107 of 728 ⏱ 9 min 🎯 Intermediate

Collation defines rules for comparing and sorting character data. Depending on the database system and selected collation, rules can determine case sensitivity, accent sensitivity, and language-specific sorting behavior.

Collation can affect filtering, sorting, joins, grouping, and uniqueness of text values. Understanding it is important when working with multilingual or inconsistent datasets.

Two databases may treat 'Finance' and 'finance' differently depending on their collation settings.

SQL 
SELECT
    CustomerName
FROM Customers
ORDER BY CustomerName;

Collation is important in international applications, customer databases, multilingual reporting, and systems that require specific text comparison rules.

  • Collation defines text comparison rules.
  • It can affect sorting.
  • It can affect case sensitivity.
  • It can affect accent sensitivity.
  • Collation behavior varies between database systems.
What is collation in SQL?

Collation defines rules used to compare and sort character data.

Why is collation important?

It can affect text comparisons, sorting, filtering, grouping, and uniqueness.

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