Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Concept explainers

SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prio…
Question

Database introduction based question 

Table: Import Primary key: ImportID Foreign key: CountryID ImportID 1 2 3 Description Electronics Electronics Macinery Year 2018 2019 2018 Value 150000 180000 80000 CountryID 1 1 2
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Transcribed Image Text:Table: Import Primary key: ImportID Foreign key: CountryID ImportID 1 2 3 Description Electronics Electronics Macinery Year 2018 2019 2018 Value 150000 180000 80000 CountryID 1 1 2
Write a SQL statement that will calculate the average value of all the imports in the year 2019.
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Transcribed Image Text:Write a SQL statement that will calculate the average value of all the imports in the year 2019.
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