Which of the following types of restrictions can be viewed with the DESCRIBE command? ( refer to the tables in the JustLee Books database). a. NOT NULL b. FOREIGN KEY c. UNIQUE d. CHECK
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Which of the following types of restrictions can be viewed with the DESCRIBE command? ( refer to the tables in the JustLee Books
a. NOT NULL
b. FOREIGN KEY
c. UNIQUE
d. CHECK
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- Which of the following types of restrictions can be viewed with the DESCRIBE command? NOT NULL FOREIGN KEY UNIQUE CHECKWhich of the following types of constraints can’t be created at the table level? ( refer to the tables in the JustLee Books database). a. NOT NULL b. PRIMARY KEY c. CHECK d. FOREIGN KEY e. None of the above constraints can be created at the table levelWhich of the following functions can be used to substitute a value for a NULL value? (refer to the tables in the JustLee Books database.)a. NVLb. TRUNCc. NVL2d. SUBSTRe. both a and df. both a and c
- 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 correctWhich of the following fields also serves as a primary key in another table when two tables are joined together on that value? a. foreign key b. primary key c. turn key d. repeating group keyWhich of the following functions can be used to include NULL values in calculations? (refer to the tables in the JustLee Books database.)a. SUMb. NVLc. MAXd. MIN
- Which of the following data dictionary objects should be used to view information about the constraints in a database? ( refer to the tables in the JustLee Books database). a. USER_TABLES b. USER_RULES c. USER_COLUMNS d. USER_CONSTRAINTS e. None of the above objects should be usedWhich of the following is the correct definition of alias in SQL statement? a. It specifies the table containing the columns listed in the SELECT clause b. It retrieves information from the database c. It is a way of renaming a column heading in the output d. It is a value that is unavailable, unassigned, unknown, or inapplicableI am trying to create this index in oracle, the table and the column exists and is not found anywhere else in the database, but it's still telling me 'Province' is an invalid identifier. I've tried changing the column name (and create statement with it), but its all just not working. CREATE INDEX StudentProvince ON ADDRESS_KR (Province);
- Which of the following statements is correct? (refer to the tables in the JustLee Books database) a. A table can contain a maximum of only one column marked as unused. b. You can delete a table by removing all columns in the table. c. Using the SET UNUSED clause allows you to free up storage space used by a column. d. None of the above statements are correct.Which of the following is not a valid constraint type? ( refer to the tables in the JustLee Books database). a. PRIMARY KEYS b. UNIQUE c. CHECK d. FOREIGN KEY4. Write a SELECT statement that selects all of the columns for the catalog view that returns information about foreign keys. How many foreign keys are defined in the AP database?