How do you perform pattern matching in SQL using wildcards?
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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