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Yes, attributes are allowed to contain a NULL value in the SQL database.
The attribute which is a primary key or a group of attribute which form a primary key is not allowed to contain a NULL value.
The foreign key can contain NULL value and duplicate value.
NULL values are the unknown value or the value which has no result in the SQL database and these values are not equal to itself.
We can't apply any relational operator with the NULL value.
|NULL == NULL||no|
|NULL <> NULL||no|
|NULL < NULL||no|
|NULL > NULL||no|
|IS NOT NULL||yes|
would either of your attributes be allowed to contain NULLS? Yes or No? Explain why or...
Complete the following table with either a yes or no regarding the attributes of a proprietorship, partnership and corporation. Attribute PresentProprietorship Partnership Corporation 1. Unlimited life 2. One owner allowed 3. Business taxed
Is it possible to create a buffer with NH3 and HCl as your starting materials? If your answer is no, explain why a buffer is not possible. If your answer is yes, which species would need to be in excess? Why? In either case, explain your reasoning with the use of a chemical equation.
1. Explain why polymers are stronger when they contain crosslinking. 2. Explain how your polymer degradation observations relate to the properties of your polymer.
If you were building a database table that contains the following attributes/fields: date, social security number, and phone number fields, how would you define each field (char, text or numeric, et.) and why? 2) Explain how and when it is appropriate to use the following SQL clauses/statements: a. GROUP BY vs. ORDER BY b. WHERE vs. HAVING
Would peanut butter contain dietary cholesterol? Why or why not?
Explain why market governance works best when the essential attributes of a financial deal are incorporated into the funding cost associate with the risk borne by investors? (typed)
What does it mean to be an effective health educator? Write a description of three attributes that you believe effective health educators should possess and explain why. Then explain how you would incorporate these attributes to become an effective provider of health education and why. Be specific and provide examples.
are strict respirers and strict anaerobes the same thing? is either yes no, would their oxygen test in thioglycolate broth look different or the same?
Explain why it would be incorrect to say that the main function of chloroplasts is to make ATP and why that means that all plant cells contain mitochondria even if they also contain chloroplasts.
• Describe in detail a problem domain in the area of GIS. • Explain in detail how you would gather data needed to address this problem. Is there a public dataset available? Would you need to purchase the data you need? • Explain how you would model and/or store the data. Would you use a relational database? A NoSQL database? A GIS-specific database? A flat file? What would your data model look like and why? How (if at all) would...