What is the difference between LIKE and equals operators in SQL?
This conceptual question tests understanding of exact matching versus pattern matching in database queries.
Why Interviewers Ask This
Choosing the right operator affects query accuracy and performance. Interviewers want to ensure you don't use pattern matching when exact matches are needed.
How to Answer This Question
Explain that '=' requires an exact match of the entire string value. 'LIKE' allows partial matching using wildcards. Mention that '=' is generally faster due to index usage, while 'LIKE' can be slower if wildcards are at the start.
Key Points to Cover
- Exact vs partial match
- Wildcard support
- Performance implications
- Use case scenarios
Sample Answer
The equals operator (=) performs an exact match, requiring the entire string to be identical. The LIKE operator allows for pattern matching using wildcards like % or _. Use '=' for precise values and 'LIKE' when searching for substrings or flexible patterns.
Common Mistakes to Avoid
- Confusing syntax
- Ignoring performance cost
- Misusing wildcards
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