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 is a correct statement? a. A commit is issued implicitly when a user exits SQL Developer or SQLPlus. b. A commit is issued implicitly when a DDL command is executed. c. A commit is issued automatically when a DML command is executed. d. All of the above are correct. e. Both a and b are correct. f. Both a and c are correct.Which of the following is true? All data in a table can be recovered if the table is dropped with the PURGE option. All data in a table can be recovered from the recycle bin if the table is dropped. All data in a table is lost if the table is dropped. All of the above statements are true.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 is a correct statement? You can restore the data deleted with the DROP COLUMN clause, but not the data deleted with the SET UNUSED clause. You can’t create empty tables—all tables must contain at least three rows of data. A table can contain a maximum of 1000 columns. The maximum length of a table name is 265 characters.Which of the following keywords allows the user to delete a record from a table, even if rows in another table reference the record through a FOREIGN KEY constraint? a. CASCADE b. CASCADE ON DELETE c. DELETE ON CASCADE d. DROP e. ON DELETE CASCADEWhich of the following commands can be used to eliminate the RECEPTIONIST role? (refer to the JustLee Books database).a. DELETE ROLE receptionist;b. DROP receptionist;c. DROP ANY ROLE;d. none of the above
- Which 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 cWhich of the following is a correct statement? ( refer to the tables in the JustLee Books database) a. You can restore the data deleted with the DROP COLUMN clause, but not the data deleted with the SET UNUSED clause. b. You can’t create empty tables—all tables must contain at least three rows of data. c. A table can contain a maximum of 1000 columns. d. The maximum length of a table name is 265 characters.Which of the following privileges allows a user to truncate tables in a database? (refer to the JustLee Books database).a. DROP ANY TABLEb. TRUNCATE ANY TABLEc. CREATE TABLEd. TRUNC TABLE
- Which 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 level. Which of the following is not a valid statement? (refer to the tables in the JustLee Books database) a. You can change the name of a table only if it doesn’t contain any data.b. You can change the length of a column that doesn’t contain any data.c. You can delete a column that doesn’t contain any data.d. You can add a column to a table.Which SQL statement key word can be used to delete a record within a table?a. DELETEb. DROPc. REMOVEd. CLEAR
