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SQL Contains String Query Guide
freecodecamp.org/news/sql-contains-string-sql-regex-example-query/Yapay zekadan makale özeti
- SQL Patterns
- SQL patterns use LIKE and NOT LIKE operators with % and _ metacharacters
- SIMILAR TO operator can replace LIKE in some SQL flavors
- LIKE operator finds strings ending with specified pattern
- NOT LIKE operator excludes strings that don't match pattern
- Regular Expressions (RegEx)
- RegEx enables flexible pattern recognition across multiple programming languages
- Basic patterns match exact character sequences
- Wildcard period matches any character
- Character classes allow matching specific character groups
- POSIX classes provide predefined character sets for common patterns
- Advanced Features
- Quantity specifiers ({2,4}) allow matching ranges of patterns
- Parentheses enable character grouping
- POSIX classes include [:alphanum:], [:digit:], [:blank:], [:space:]
- Case sensitivity can be controlled with POSIX operators
- Important Notes
- Contains String queries can be resource-intensive
- Case sensitivity can be changed in SQL
- POSIX classes include both uppercase and lowercase letters