Essential PostgreSQL - DZone Refcardz
Funciones PostgreSQL archivos » Página 4 de 7 » MiguelTroyano.com
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PostgreSQL] 문자열 함수 (자르기, 붙히기, 치환 등)
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sql: propose alternatives to LTRIM, RTRIM, BTRIM, TRIM that help the user customize what gets trimmed · Issue #16043 · cockroachdb/cockroach · GitHub
PostgreSQL TRIM() function - w3resource
