---
id: sql-insert-into-select
title: "SQL Insert Into Select"
category: "Database"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["SQL INSERT INTO SELECT Statement", "INSERT INTO SELECT"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.88
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["sql", "database", "w3schools", "insertintoselect"]
raw_sources: ["https://www.w3schools.com/sql/sql_insert_into_select.asp"]
applied_in: []
github_commit: ""
---

# [[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):
```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).