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.
While both retinol and Retin-A contain retinoids, they differ in their concentration. Retinol and other forms, such as retinal and retinyl palmitate are found in many over-the-counter anti-aging creams. While these all contain a form of vitamin A, the concentration of retinoids is weak. Retin-A is a prescription retinoid and is a brand name for tretinoin, which is the carboxylic acid form of vitamin A and was one of the early topical acne treatments. Retin-A is sold by prescription because its acid composition is much greater than in over-the-counter products.