【SQL超入門講座】17.DISTINCT｜重複した値を排除して抽出する方法
【SQL超入門講座】17.DISTINCT｜重複した値を排除して抽出する方法
Jul 18, 2021
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SQL SELECT DISTINCT - Count and workaround | w3schools.com
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Databytes on Instagram: "2026 me toh duniya khatam hai but khatam hone se pehle ye difference samajh lo because this confusion breaks real queries. COUNT(*) vs COUNT(1) vs COUNT(col) vs COUNT(DISTINCT col) This reel explains what each one actually counts how null values behave when rows are ignored and why old performance myths around COUNT(1) no longer apply in modern databases. If you are learning SQL data analytics or data science or preparing for interviews this clarity matters because small
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