What is a private key? O a. A primary key of another entity b. An entity's unique identifier Oc. A type of database component O d. None of the above
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Answer:
The correct option is “(b) an entity’s unique identifier”
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- Which of the following are true about primary keys? SELECT ALL THAT APPLY. A) They must reference one or more columns in a single table. B) They are usually implemented using an index. C) They guarantee that no two rows in a table have duplicate primary key values. D) They must be defined for every database table.Defineanomaly? What's the big deal about finding three outliers in a database? When will you take notice of the issues and provide a solution?What are the four basic types of operations for a database application? a. Insert, Select, Update, and Delete b. Insert, Update, Delete, and Create c. Insert, Update, Delete, and Render d. Insert, Select, Update, and Render If stringa="Good Morning", what is the value of stringa[1:5]? a. "Good " b. "ood " c. "Good" d. "ood M" The instance that “a survey respondent in service occupation (x) is less likely to report income ” is an example of __________ . a. Missing completely at random. b. Missing at random. c. Missing not at random. d. None of the above.
- Hello can you help me make a normalized ERD using the table details from below The database name is Vaccination and there is a table login and table record which is below Thank You very muchHow do locks work? Describe the main distinction between a shared lock and an exclusive lock during a database transaction.Can you answer question 4 and 5: question 4: The unique identity assigned to each independent object in an ODB database is known as the:A) primary keyB) hidden valueC) candidate key D) foreign keyE) object identtiferquestion 5: One type of transaction schedulcing which is always considered to be correct is a(n) blank schedulce:A) serializable B) SQLC) train-basedD) deadlock E) object -oriented
- 1. Which of the following statements about ScroogeCoin is INCORRECT? A. A designated entity called Scrooge publishes an append‐only ledger containing the history of all the transactions that have happened. B. Scrooge can build a block chain, which is a series of data blocks, each with one transaction in it. C. ScroogeCoin can address the double spending issue. D. ScroogeCoin can implement coin minting, transaction, and IDs' assignment in a fully decentralized way.Which of the following is the representation of an entity in a database? Group of answer choices foreign key relation primary key attributeHelloI hope to answer my question and don't use your handwriting, pleaseThank you Try the answer to be unique with references please Describe two techniques that could be used to tune database schema. Support your answer with at least one example for each technique
- Which of the following has no repeating groups but can contain partial or transitive dependencies? unnormalized data 1NF 2NF 3NFHow is a database lockout different from a databasedeadlock? Give an accounting example to illustrate why a databaselockout is necessary and how a deadlock can occur. Use actual tablenames in your example.Which of the following three types of database critical events may initiate the database recovery procedure? Provide illustrations for each.Make a list of and explain the five transaction attributes.
