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Union and union all in sql server in arabic Video Lecture | SQL Server Administration: Basic Tutorials (in Arabic) - Database Management
FAQs on Union and union all in sql server in arabic Video Lecture - SQL Server Administration: Basic Tutorials (in Arabic) - Database Management
| 1. ما هو استخدام UNION في SQL Server؟ |  |
Ans. UNION في SQL Server يستخدم لجمع نتائج عدة استعلامات SELECT في مجموعة واحدة. يقوم UNION بإزالة أي تكرارات من النتائج ويعرض النتائج الفريدة فقط.
| 2. ما هو الفرق بين UNION و UNION ALL في SQL Server؟ | |
Ans. الفرق الرئيسي بين UNION و UNION ALL في SQL Server هو أن UNION يقوم بإزالة أي تكرارات من النتائج المجتمعة، بينما يعرض UNION ALL جميع النتائج بما في ذلك التكرارات.
| 3. هل UNION و UNION ALL يعملان على نفس عدد الأعمدة؟ | |
Ans. نعم، يجب أن يحتوي كلا UNION و UNION ALL على نفس عدد الأعمدة في كل استعلام SELECT. يجب أن يتم تطابق أنواع البيانات وترتيب الأعمدة أيضًا.
| 4. هل يؤثر UNION و UNION ALL على ترتيب النتائج المجتمعة؟ | |
Ans. UNION في SQL Server يقوم بترتيب النتائج المجتمعة حسب الأعمدة المحددة في الاستعلام الأول. في حين أن UNION ALL لا يؤثر على ترتيب النتائج المجتمعة ويعرضها بالترتيب الذي تم استعلامه به.
| 5. هل يمكن استخدام UNION و UNION ALL مع استعلامات SELECT المختلفة؟ | |
Ans. نعم، يمكن استخدام UNION و UNION ALL مع استعلامات SELECT مختلفة، ولكن يجب أن يحتوي كل استعلام SELECT على نفس عدد الأعمدة ونوع البيانات المتطابقة ليتمكن من الجمع بنجاح.
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Nov 24, 2024 Last updated |
Video Description: Union and union all in sql server in arabic for Database Management 2024 is part of SQL Server Administration: Basic Tutorials (in Arabic) preparation.
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