sql-queries

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## Dialect-Specific Reference ### PostgreSQL (including Aurora, RDS, Supabase, Neon) **Date/time:** ```sql -- Current date/time CURRENT_DATE, CURRENT_TIMESTAMP, NOW() -- Date arithmetic date_column + INTERVAL '7 days' date_column - INTERVAL '1 month' -- Truncate to period DATE_TRUNC('month', created_at) -- Extract parts EXTRACT(YEAR FROM created_at) EXTRACT(DOW FROM created_at) -- 0=Sunday -- Format TO_CHAR(created_at, 'YYYY-MM-DD') ``` **String functions:** ```sql -- Concatenation first_name ||