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PostgreSQL LEFT() Function: Extract Characters From the Left of a String - CommandPrompt Inc.
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PostgreSQL SUBSTRING Function detail with examples | Substring real life examples for IT &bank #VD56 - YouTube
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old postgres needs 'right' and 'left' string functions - provided here · Issue #57 · OHDSI/AchillesWeb · GitHub
PostgreSQL string functions
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PostgreSQL LEFT() function - w3resource
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Format Number in PostgreSQL - DatabaseFAQs.com
PostgreSQL String Functions | Basics and Examples
PostgreSQL SUBSTRING() Function with Regex Example
