Which of the following requires the values in a foreign key have a matching value in the primary key to which the foreign key corresponds? Group of answer choices referential integrity constraint identity increment synchronization key matching constraint
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- Which of the following types of constraints cant be created at the table level? a. NOT NULL b. PRIMARY KEY c. CHECK d. FOREIGN KEY e. None of the above constraints can be created at the table level.Which of the following SQL statements is invalid and returns an error message? ALTER TABLE books ADD CONSTRAINT books_pubid_uk UNIQUE (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_pk PRIMARY KEY (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_nn NOT NULL (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_fk FOREIGN KEY (pubid) REFERENCES publisher (pubid); All of the above statements are invalid.Suppose you created a PRIMARY KEY constraint at the same time you created a table and later decide to name the constraint. Which of the following commands can you use to change the constraint’s name? ALTER TABLE … MODIFY ALTER TABLE … ADD ALTER TABLE … DISABLE None of the above commands can be used.
- What is the difference between disabling a constraint and dropping a constraint?Which of the following data dictionary objects should be used to view information about the constraints in a database? USER_TABLES USER_RULES USER_COLUMNS USER_CONSTRAINTS None of the above objects should be used.Which of the following statements is correct? ( refer to the tables in the JustLee Books database). a. A PRIMARY KEY constraint allows NULL values in the primary key column(s). b. You can enable a dropped constraint if you need it in the future. c. Every table must have at least one PRIMARY KEY constraint, or Oracle 12 c doesn’t allow the table to be created. d. None of the above statements is correct
- Which key exist a primary key in another table Foreign key Artificial key Stable key Composite keyWhich of the following is true of foreign keys? A foreign key should always be linked to a primary key of another table. A foreign key could be linked to a candidate key of a table. A foreign key is not needed if the data type is different. A foreign key can be linked to any foreign key.Which of the following is a valid SQL command? ( refer to the tables in the JustLee Books database). a. ALTER TABLE books ADD CONSTRAINT UNIQUE (pubid); b. ALTER TABLE books ADD CONSTRAINT PRIMARY KEY (pubid); c. ALTER TABLE books MODIFY (pubid CONSTRAINT NOT NULL); d. ALTER TABLE books ADD FOREIGN KEY CONSTRAINT (pubid) REFERENCES publisher (pubid); e. None of the above commands is valid.
- Which one of the following is not a property of Transactions? a) Atomic b) Consistency c) Backup d) Isolation e) Durability Which one of the following should be specified in the statement if an SQL SELECT statement contains a HAVING clause? a) ORDER BY b) LIKE c) ORDER BY ASC d) GROUP BY e) WHERE The “IN” operator is used to compare a single value with a set in an SQL WHERE Clause. It is equivalent to which one of the following operators? a) = b) EXISTS c) > ANY d) = ANY e) none of the above. In order for the LIKE operator to match exactly one character, which one of the following symbols should be used? a) * b) _ c) % d) & e) |Which of the following queries creates a Cartesian join?(refer to the tables in the JustLee Books database.)a. SELECT title, authoridFROM books, bookauthor;b. SELECT title, nameFROM books CROSS JOIN publisher;c. SELECT title, giftFROM books NATURAL JOIN promotion;d. all of the aboveWhich one of the following statements is wrong? ( ) Alternate keys are candidate keys. ( ) Foreign key cannot have value NULL. ( ) If the foreign key value of a table neither matches any candidate key of its home relation nor is null, referential integrity of the table does not hold. ( ) A primary key may consist of all attributes of a table.