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Wednesday, May 13, 2015

SQL (Structured Query Language) is a database computer language

Introduction of SQL (Structured Query Language):



SQL (Structured  Query   Language) is a database  computer language des ginned for managing .
     
Data in relational database management systems (RDBMS).

SQL is a standardized computer language that    was originally developed by IBM for querying, altering and defining relational databases, using declarative statements.  
      

What can SQL do?     

      
• SQL can execute queries against a database   
• SQL can retrieve data from a database              
• SQL can insert records in a database   
• SQL can update records in a database
• SQL can delete records from a database           
• SQL can create new databases              
• SQL can create new tables in a  database            
• SQL can create stored  procedures in a database            
• SQL can create views  in a database    
• SQL can set permissions on tables, procedures, and views


Even if  SQL is    a standard, many of the  database systems that  exist today implement  their own version  of the SQL language. In   this document   we will  use the Microsoft SQL Server as an example. 

Here are some  examples of SQL queries:






Sql Server Interview Qus:



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