How do you perform pattern matching in SQL using wildcards?
Direct Answer
This question checks proficiency in string manipulation and searching capabilities within SQL.
Why Interviewers Ask This
String search is a common requirement. Interviewers want to ensure you know the standard syntax and variations across different database systems for flexible text matching.
How to Answer This Question
Explain LIKE operator with % (any length) and _ (single char). Mention case-insensitive options like ILIKE or REGEXP for specific databases. Include ESCAPE clause for literal matching.
Key Points to Cover
- LIKE operator basics
- Wildcard symbols
- Case sensitivity variations
- Escape sequences
Sample Answer
SQL supports pattern matching mainly with the LIKE operator using wildcards: % for any-length string and _ for a single character. PostgreSQL offers case-insensitive ILIKE, while MySQL/SQLite provide REGEXP operators. Al…
Common Mistakes to Avoid
- Misusing wildcards
- Ignoring case sensitivity
- Not escaping special chars
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