The <u>type 2</u> slowly changing dimension approach creates a new additional dimension record using a new value for the surrogate key every time a value in a dimension record changes. The correct answer is B.
<h3>Understanding the Slowly Changing Dimension</h3>
SCD, or slowly changing dimension, can be defined as a dimension in a data warehouse that stores and maintains the current data and the historical data over time. A slowly changing dimension in a star schema contains two different attributes values: do not change and change occasionally. Here is the difference:
- Attributes whose values do not change (or change very infrequently), including such store size and client gender.
- Attributes whose values vary intermittently and irregularly throughout time, such as customer zip code and staff salary.
The three most common approaches for coping with slowly changing dimensions are as follows:
Whenever a value in a dimension record changes, type 2 of a slowly changing dimension produces a new extra dimension record with a new value for the surrogate key. This type is also utilized when history needs to be kept, and it may be paired with the usage of timestamps and row indications.
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Answer:
Your doctor will use a stethoscope to listen to both heart and lung sounds and may order some or all of the following tests. The most effective and common method for diagnosing COPD is spirometry. It’s also known as a pulmonary function test or PFT. This easy, painless test measures lung function and capacity.
Explanation:
Answer:
b. Starch is a polysaccharide composed of a-glucose subunit (monomers).
Explanation:
"The basic chemical formula of the starch molecule is (C6H10O5)n. Starch is a polysaccharide comprising glucose monomers joined in α 1,4 linkages."
Reference: Britannica, The Editors of Encyclopaedia. “Starch.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 2019
Answer:
The answer to the question: These cells provide for the sense of smell:___, would be, A: Olfactory hair cells.
Explanation:
The sense of smell might be one of the most primitive, but also one of the most amazing senses of the human system. This sense initiates with the introduction of smells, in the form of chemical molecules dissolved in air, that once they come into contact with the mucus in the nostrils dissolve and reach a group of cells, on the olfactory epithelium known as the olfactory receptor neurons. These cells capture the chemicals and send neural signals towards the olfactory bulbs, where sensory neurons relay the messages towards the brain centers. In the brain, several steps take place in order to gain sense, comprehension and assimilation of the smell that has been captured.
