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📚 LENGTH

The LENGTH function is used in SQL to return the number of characters (or bytes) in a string.
It helps analyze string sizes or validate input lengths.

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🛠️ Basic Syntax

SELECT LENGTH(column_name)
FROM table_name;

• LENGTH(column_name) returns the length of the text in characters (or bytes, depending on the database).

Example

SELECT LENGTH(first_name) AS name_length
FROM employees;

• This query returns the number of characters in each employee's first name.

Key Points

• In some databases (like MySQL), LENGTH returns bytes, while CHAR_LENGTH returns characters.
• For Unicode strings (e.g., UTF-8), the number of bytes may differ from the number of characters.
• Always check your database documentation if exact character count vs byte count matters.

Additional Example

SELECT LENGTH(description) AS description_length
FROM products;

• This query measures the length of each product description.

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🎥 Video Notes

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📝 Problem Description

Describe the problem, challenge, or topic discussed in a video related to SELECT FROM.
What concept was explained or what exercise was solved?

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DataBase Given

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💻 My SQL Code

-- Write your SQL code attempt or solution related to SQL COMMAND
SQL COMMAND

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🧠 Solution Code / Explanation

SQL COMMAND

Explanation - Explain what you learned, any key takeaways, or how you solved the problem related to COMMAND._

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