Question

write short notes of Query​

Answer 1

Answer:

A query is a question, often expressed in a formal way. A database query can be either a select query or an action query. A select query is a data retrieval query, while an action query asks for additional operations on the data, such as insertion, updating or deletion.

Answer 2

The classification of economic activities into primary, secondary and tertiary is useful, as it helps to classify the different occupations that are taken up by the people in the country and how much each sector contributes to the growth of the country. It is also important because it helps in asserting that which sector contributes the most in the GDP and which sector has the scope to employ more people and increase the National Income.