Filtering, Ordering, LIMIT, LIKE, and Everyday Query Patterns
Write more useful MySQL queries by filtering rows, ordering results, and applying common search patterns.
Inside this chapter
- WHERE Clauses
- ORDER BY and LIMIT
- LIKE and Pattern Matching
- Combining Conditions
- Business Example
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WHERE Clauses
SELECT *
FROM students
WHERE enrolled_on >= '2026-01-01';The WHERE clause is how MySQL narrows results based on conditions. It is essential for targeted lookups, reports, and business rules.
ORDER BY and LIMIT
SELECT *
FROM students
ORDER BY enrolled_on DESC
LIMIT 10;Ordering and limits are crucial for lists, dashboards, recent-activity pages, and top-N reports.
LIKE and Pattern Matching
SELECT *
FROM students
WHERE name LIKE 'A%';LIKE supports simple pattern-based searches. It is common in admin filters, search interfaces, and exploratory reporting.
Combining Conditions
Developers often combine AND, OR, and parentheses to express business rules more precisely. Clear condition design is important because filtering errors can quietly return wrong business results.
Business Example
A support dashboard may show the latest 20 high-priority tickets updated this week and assigned to a certain team. Queries like that depend on good filtering, ordering, and limits.