How are the applications of the aggregate function in a SQL server?

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V.r. Naga Pawan Yallapragada

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Used for grouping . Ex: counting no. of employees in various departments in an oragnization.
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How do I become master in SQL server? I am looking for real time case studies to write queries, stored procedures etc.
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Which is a good reference book to learn SQL and database from basics?
You can learn by MS SQL Bigners book.
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I need your help to choose my career as I have three years of gap between my education. I know SQL. Can anyone tell me should I choose MS SQL server or oracle because I am interested in the database? Which one will be better to learn to get into the IT industry? Please help me! Thank you!
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You can teach students Online as well as offline. If you want to teach online you need to have a communicating media.
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