Views are very useful and are used for several purposes. A VIEW is a virtual table and donât need any physical space to save data. Only VIEW definition is stored in DATA DICTIONARY and every time VIEW is queried; the SQL statement is executed and result is returned back to the user.VIEWS in Teradata can be created by using following syntax: Allows to limit access to the columns present in the base table by SELECTing only required columns. 2  Combine the result from multiple tables and provide single place to access the records. 3  You can use the VIEW to insert or update the data present in the base table.
1. You have no idea what a retinoid is. The term describes vitamin A derivatives that unclog pores, boost collagen to reduce fine lines, and speed cell turnover to even out discoloration and smooth the skinâsometimes in as little as four weeks.
These drugs are available as topical or oral drugs. Topical retinoids clear up moderate-to-severe acne by normalizing the way the skin grows and sheds. They can be used in combination with other acne products, such as benzoyl peroxide and oral antibiotics. Topical retinoids don't have the severe side effects of oral retinoids; however, they aren't recommended for pregnant or nursing women. Side effects of topical retinoids include redness, dryness, and itchy skin. For severe cystic acne, isotretinoin is the most effective therapy. This drug is the only drug that intervenes in all of the causes of acne. It can often even clear severe acne that hasn't responded to other treatments.