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In SQL, like condition allows you to use wild card characters to perform matching. Which of the following is a valid wild card character?
- a)_
- b)$
- c)%
- d)More than one of the above
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
In SQL, like condition allows you to use wild card characters to perfo...
Key Points
The commonly used wildcard characters in SQL LIKE:
The commonly used wildcard characters in SQL LIKE:
- %: Matches zero, one, or more characters.
- _: Matches a single character (any letter, number, or symbol).
Examples:
- SELECT * FROM customers WHERE name LIKE '%en%'; - This query will find all customer names that contain the letters "en" anywhere in the name (e.g., "John", "Steven", "Weekend").
- SELECT * FROM products WHERE code LIKE 'PR%'; - This query will find all product codes that start with "PR" followed by any characters (e.g., "PR123", "PR-ABC").
- SELECT * FROM users WHERE username LIKE 'user_'; - This query will find all usernames that start with "user_" followed by a single character (e.g., "user_a", "user_1").
Most Upvoted Answer
In SQL, like condition allows you to use wild card characters to perfo...
Understanding SQL Wildcard Characters
In SQL, wildcard characters are essential for performing pattern matching in queries, especially when using the LIKE condition. Let's explore the valid wildcard characters.
Valid Wildcard Characters in SQL
- Underscore (_) : Represents a single character. For example, "A_" would match "AL", "AM", or "AN".
- Percent (%): Represents zero or more characters. For instance, "A%" would match any string starting with "A", like "Apple", "Avocado", or "A".
Invalid Wildcard Characters
- Dollar Sign ($): This character is not a valid wildcard in SQL for pattern matching. Its use is generally seen in other programming contexts or languages.
Correct Answer Breakdown
Since both the underscore (_) and percent (%) are valid wildcard characters in SQL, the correct answer to the question is option 'D' - "More than one of the above".
Conclusion
Understanding these wildcard characters enhances your ability to construct dynamic queries in SQL. Utilizing them effectively allows for more flexible data retrieval, accommodating various data patterns and structures.
In SQL, wildcard characters are essential for performing pattern matching in queries, especially when using the LIKE condition. Let's explore the valid wildcard characters.
Valid Wildcard Characters in SQL
- Underscore (_) : Represents a single character. For example, "A_" would match "AL", "AM", or "AN".
- Percent (%): Represents zero or more characters. For instance, "A%" would match any string starting with "A", like "Apple", "Avocado", or "A".
Invalid Wildcard Characters
- Dollar Sign ($): This character is not a valid wildcard in SQL for pattern matching. Its use is generally seen in other programming contexts or languages.
Correct Answer Breakdown
Since both the underscore (_) and percent (%) are valid wildcard characters in SQL, the correct answer to the question is option 'D' - "More than one of the above".
Conclusion
Understanding these wildcard characters enhances your ability to construct dynamic queries in SQL. Utilizing them effectively allows for more flexible data retrieval, accommodating various data patterns and structures.
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