Database Administration Questions

The law of conservation of mass states that in any closed system the mass of the system is neither created nor destroyed over time i.e, the mass cannot be changed overtime.

Hence, the given statement is true.

A search engine is a set of programs which enables users to search documents and files ihe world wide web.

Common search engines are Google, Yahoo, Bing,...

Biotin is a water-soluble B vitamin, also called vitamin B7 and formerly known as vitamin H or coenzyme R.

The difference between Union and Union all is that Union all will not eliminate duplicate rows, instead it just pulls all rows from all tables fitting your query specifics and combines them into a table. A UNION statement effectively does a SELECT DISTINCT on the results set.

I am History.

Yes, history refers to all the past, but we can create history in the presentand it cannot be polluted in the future.

Here all the options given are important functions of Earth's atmosphere.

ZIP file is an archive file format that supports lossless data compression. Lossless is a fairly popular data compression method that is used in a number of different applications. Files can become corrupted when they are transferred over the internet in an uncompressed format. It enables devices to transmit or store the same amount of data in fewer bits.

Ctrl + F is a shorcut keyword and it is used for searching the word you want in the large document in the M.S. Word.