2nd/10_Wiki/Dev/Topic_SQL/SQL_Order_By.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
sql-order-by	SQL Order By	Database	draft	conceptual		SQL ORDER BY Keyword ORDER BY clause SQL 정렬		B	0.9	2026-07-04	2026-07-04			sql database w3schools orderby sorting	https://www.w3schools.com/sql/sql_orderby.asp

SQL Order By

🎯 한 줄 통찰 (One-line insight)

ORDER BY sorts a result-set by one or more columns, ascending by default, and can mix ascending/descending direction per column. [S1]

🧠 핵심 개념 (Core concepts)

• ORDER BY keyword — sorts the result-set in ascending (ASC, default) or descending (DESC) order. [S1]
• Syntax — SELECT column1, column2, ... FROM table_name ORDER BY column1, column2, ... ASC|DESC;. [S1]
• Alphabetical sorting — for text columns, ORDER BY sorts alphabetically (and reverse-alphabetically with DESC). [S1]
• Multi-column sort — sorting by several columns applies the first column as primary sort key and subsequent columns as tie-breakers. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Per-column direction — each column in a multi-column ORDER BY can independently specify ASC or DESC, e.g. ORDER BY Country ASC, CustomerName DESC. [S1]

📖 세부 내용 (Details)

• Sort ascending by default: SELECT * FROM Products ORDER BY Price;. [S1]
• Sort descending: SELECT * FROM Products ORDER BY Price DESC;. [S1]
• Sort multiple columns, Country first then CustomerName as tie-break: SELECT * FROM Customers ORDER BY Country, CustomerName;. [S1]
• Combine directions per column: SELECT * FROM Customers ORDER BY Country ASC, CustomerName DESC;. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 정렬은 이후 JOIN/GROUP BY 결과를 사람이 읽기 좋게 만드는 데 반복적으로 함께 쓰인다. [S1]

💻 코드 패턴 (Code patterns)

Sort ascending (default) then descending (SQL):

SELECT * FROM Products ORDER BY Price;
SELECT * FROM Products ORDER BY Price DESC;

Multi-column sort with mixed direction (SQL):

SELECT * FROM Customers
ORDER BY Country ASC, CustomerName DESC;

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.90
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: SQL Tutorial
• 관련 개념: SQL Select, SQL Where, SQL Group By
• 참조 맥락: 조회 결과를 정렬해서 보여줘야 하는 모든 쿼리에서 재사용되는 기본 문법.

📚 출처 (Sources)

• [S1] W3Schools — SQL ORDER BY Keyword — https://www.w3schools.com/sql/sql_orderby.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "SQL ORDER BY Keyword" page (Astra wiki-curation, P-Reinforce v3.1 format).