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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).

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