2nd/10_Wiki/Dev/Topic_SQL/SQL_Insert_Into_Select.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-insert-into-select	SQL Insert Into Select	Database	draft	conceptual		SQL INSERT INTO SELECT Statement INSERT INTO SELECT		B	0.88	2026-07-04	2026-07-04			sql database w3schools insertintoselect	https://www.w3schools.com/sql/sql_insert_into_select.asp

SQL Insert Into Select

🎯 한 줄 통찰 (One-line insight)

INSERT INTO SELECT copies rows from one existing table into another EXISTING table, leaving the target's current rows untouched — unlike SELECT INTO, which creates a brand-new table. [S1]

🧠 핵심 개념 (Core concepts)

• INSERT INTO SELECT statement — copies data from an existing table and inserts it into another existing table. [S1]
• Data type matching required — source and target table column data types must match. [S1]
• Target rows preserved — existing records in the target table are unaffected by the insert. [S1]
• Syntax (all columns) — INSERT INTO target_table SELECT * FROM source_table WHERE condition; — requires column count/order to match exactly if names are omitted. [S1]
• Syntax (specific columns) — INSERT INTO target_table (column1, column2, ...) SELECT column1, column2, ... FROM source_table WHERE condition;. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Partial-column copy leaves NULLs — copying only some target columns (e.g. CustomerName, City, Country) leaves the unmapped target columns as NULL for the inserted rows. [S1]
• Filtered source-to-target copy — a WHERE clause on the source SELECT restricts which rows get copied (e.g. only German suppliers). [S1]

📖 세부 내용 (Details)

• Copy specific columns from Suppliers into Customers: INSERT INTO Customers (CustomerName, City, Country) SELECT SupplierName, City, Country FROM Suppliers;. [S1]
• Copy all columns (requires matching schema): INSERT INTO Customers SELECT * FROM Suppliers;. [S1]
• Copy a filtered subset: INSERT INTO Customers (CustomerName, City, Country) SELECT SupplierName, City, Country FROM Suppliers WHERE Country='Germany';. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — SELECT INTO(새 테이블 생성)와 대비되는, 기존 테이블 간 데이터 이관에 쓰이는 문서다. [S1]

💻 코드 패턴 (Code patterns)

Copy filtered rows between existing tables (SQL):

INSERT INTO Customers (CustomerName, City, Country)
SELECT SupplierName, City, Country FROM Suppliers
WHERE Country='Germany';

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.88
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: SQL Tutorial
• 관련 개념: SQL Select Into, SQL Insert Into, SQL Where
• 참조 맥락: 기존 테이블 간 데이터 이관 시 사용 — 새 테이블을 만들어야 한다면 대신 SELECT INTO를 사용.

📚 출처 (Sources)

• [S1] W3Schools — SQL INSERT INTO SELECT Statement — https://www.w3schools.com/sql/sql_insert_into_select.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "SQL INSERT INTO SELECT Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).