What will happen if in the above query we write "Aaliya" as "AALIYA" or "aaliya" or "AaLIYA"? Will the query g

Think & Reflect · Q8

Q. What will happen if in the above query we write "Aaliya" as "AALIYA" or "aaliya" or "AaLIYA"? Will the query generate the same output or an error?

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Concept understanding — Case Sensitivity

Case Sensitivity: A First Look

Imagine you're writing your name on a form. You might write "Rahul" with a capital R, or "rahul" all in lowercase. To you, both mean the same person. But to a computer, those two spellings are as different as "Rahul" and "Sharma" — they are treated as entirely separate things.

That is the core idea of case sensitivity: the distinction between uppercase (capital) and lowercase letters. A system that is case-sensitive treats 'A' and 'a' as different characters. A system that is case-insensitive treats them as the same.

The Everyday Intuition

In human language, we use capital letters for specific purposes — the start of a sentence, proper names, titles. But we rarely confuse meaning because of them. "Apple" (the fruit) and "apple" (the same fruit) are obviously the same word to us. The capital letter is just a convention, not a change in identity.

Computers, however, are literal machines. They don't "understand" meaning the way we do. They compare things character by character. The letter 'A' has a different internal code than 'a'. So when a computer checks if "Apple" equals "apple", it sees two different sequences and says: no match.

Where It Matters

Case sensitivity shows up in many places you will encounter as a commerce or humanities student:

Email addresses: Most email systems are case-insensitive. [PII:email] reaches the same inbox as [PII:email]. But the part before the @ might be treated differently by some systems — so it's safest to use all lowercase.
Passwords: These are almost always case-sensitive. Password123 and password123 are completely different passwords. This is why you must type your password exactly as you created it, with the same capitals.
File names: On some systems (like Windows), file names are case-insensitive — Report.docx and report.docx refer to the same file. On others (like Linux), they are case-sensitive — those would be two different files.
Website URLs: The domain name part (like google.com) is case-insensitive. But everything after the first slash can be case-sensitive, depending on the server. So Example.com/Page might work, but example.com/page might not. …

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MySQL compares strings using the column's collation, and the default collations are case-insensitive (_ci). So:

SELECT * FROM STUDENT WHERE SName = 'AaLIYA';
``` …

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The query will run without any error and — in MySQL's default setup — will produce the same output for "AALIYA", "aaliya" and "AaLIYA". String comparison in MySQL's default collations is case-insensitive, so all four spellings match the stored value Aaliya.

Try it and see

The original lookup:

SELECT * FROM STUDENT WHERE SName = 'Aaliya';

Now the three variations:

SELECT * FROM STUDENT WHERE SName = 'AALIYA';
SELECT * FROM STUDENT WHERE SName = 'aaliya';
SELECT * FROM STUDENT WHERE SName = 'AaLIYA';

Every one of them returns the same row:

RollNumber	SName	Class
101	Aaliya	11

Why — two different kinds of "case" in SQL

Keywords (SELECT, WHERE, ...) are always case-insensitive, so case can never cause a syntax error here.
String values are compared according to the column's collation. MySQL's default collations end in _ci — case-insensitive (for example utf8mb4_0900_ai_ci). Under a _ci collation, 'AALIYA' = 'Aaliya' evaluates to true, so the WHERE clause selects the very same row each time. …

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Q.What will happen if in the above query we write "Aaliya" as "AALIYA" or "aaliya" or "AaLIYA"? Will the query generate the same output or an error?

Try it and see

Why — two different kinds of "case" in SQL

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