What is the difference between LIKE and = operators in SQL?
This conceptual SQL question examines your understanding of exact matching versus pattern matching.
Why Interviewers Ask This
Knowing when to use exact matches versus patterns is crucial for accurate data filtering. Interviewers assess your logical approach to querying data.
How to Answer This Question
Explain that '=' requires an exact match of the entire string. 'LIKE' allows partial matching using wildcards. Highlight performance implications as LIKE can be slower due to scanning.
Key Points to Cover
- Exact vs partial matching
- Wildcard support in LIKE
- Performance considerations
Sample Answer
The '=' operator performs an exact match, requiring the entire column value to equal the specified string. The 'LIKE' operator allows pattern matching using wildcards like '%' or '_'. Use '=' for precise values and 'LIKE' for searching substrings or patterns.
Common Mistakes to Avoid
- Using LIKE for exact matches unnecessarily
- Confusing % with _
- Ignoring case sensitivity settings
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