Files

T

Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
  (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거.
- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
  Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/
  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
- Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/
  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

2026-07-05 00:39:13 +09:00

3.5 KiB

Raw Blame History

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

title

SQL Like

🎯 한 줄 통찰 (One-line insight)

LIKE searches for a text pattern in a column using the % (any characters) and _ (single character) wildcards, and can express starts-with/ends-with/contains matching. [S1]

🧠 핵심 개념 (Core concepts)

LIKE operator — used in a WHERE clause to search for a specified pattern within a column's text data. [S1]
Syntax — SELECT ... FROM table_name WHERE columnN LIKE pattern;. [S1]
% wildcard — represents zero, one, or multiple characters. [S1]
_ wildcard — represents exactly one character. [S1]
No wildcard — without a wildcard, LIKE requires an exact match. [S1]

🧩 추출된 패턴 (Extracted patterns)

Positional-% recipe — pattern% = starts with, %pattern = ends with, %pattern% = contains, pattern (no %) = exact match. [S1]
Combine with AND/OR — multiple LIKE conditions can be combined, e.g. CustomerName LIKE 'a%' OR CustomerName LIKE 'b%'. [S1]
Wildcard stacking — % and _ can be combined in one pattern, e.g. 'a__%' (starts with "a", at least 3 chars) or '_r%' ("r" in second position). [S1]

📖 세부 내용 (Details)

Starts with: WHERE CustomerName LIKE 'a%';. [S1]
Contains: WHERE city LIKE '%on%';. [S1]
Single-character wildcard: WHERE city LIKE 'l_nd__'; (l + 1 wildcard char + "nd" + 2 wildcard chars). [S1]
Ends with: WHERE CustomerName LIKE '%a';. [S1]
Starts-and-ends: WHERE CustomerName LIKE 'b%s';. [S1]
Exact match (no wildcard): WHERE Country LIKE 'Spain';. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 다음 챕터인 SQL Wildcards에서 [], -, ^ 같은 추가 와일드카드 문법이 확장된다. [S1]

💻 코드 패턴 (Code patterns)

Starts-with / contains / ends-with (SQL):

SELECT * FROM Customers WHERE CustomerName LIKE 'a%';   -- starts with
SELECT * FROM Customers WHERE city LIKE '%on%';          -- contains
SELECT * FROM Customers WHERE CustomerName LIKE '%a';    -- ends with

✅ 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 Where, SQL Wildcards, SQL Not
참조 맥락: 텍스트 패턴 매칭이 필요한 모든 검색 쿼리의 기반 문법 — 다음 챕터 Wildcards에서 문법이 확장된다.

📚 출처 (Sources)

[S1] W3Schools — SQL LIKE Operator — https://www.w3schools.com/sql/sql_like.asp

📝 변경 이력 (Change history)

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

3.5 KiB Raw Blame History