Which key exist a primary key in another table Foreign key Artificial key Stable key Composite key
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Which key exist a primary key in another table
- Foreign key
- Artificial key
- Stable key
- Composite key
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- 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 is a valid table name? a. 9NEWTABLE b. DATE9 c. NEWTABLE d. None of the above are valid table names.
- Which of the following statements is correct? A table can contain a maximum of only one column marked as unused. You can delete a table by removing all columns in the table. Using the SET UNUSED clause allows you to free up storage space used by a column. None of the above statements are correct.Which of the following types of restrictions can be viewed with the DESCRIBE command? NOT NULL FOREIGN KEY UNIQUE CHECKWhich of the following statements deletes all rows in the HOMEWORK10 table? a. DELETE FROM homework10; b. DELETE . FROM homework10; c. DELETE FROM homework10; d. DELETE FROM homework10 WHERE amid = ; e. Both c and d delete all rows in the HOMEWORK10 table.
- 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.Which of the following is a valid SQL statement? SELECT * WHERE amid = ‘J100’ FOR UPDATE; INSERT INTO homeworkl0 VALUES (SELECT * FROM acctmanager); DELETE amid FROM acctmanager; rollback; all of the aboveWhich of the following is not a valid SQL statement? CREATE TABLE anothernewtable (newtableid VARCHAR2 (2)); CREATE TABLE anothernewtable (date, anotherdate) AS (SELECT orderdate, shipdate FROM orders); CREATE TABLE anothernewtable (firstdate, seconddate) AS (SELECT orderdate, shipdate FROM orders); All of the above are valid statements.
- 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 statements retrieves data from the Sales table and stores it in the CompanyDataSet? Me.CompanyDataSet.Fill(Me.Sales) Me.SalesBindingSource.Fill(Me.CompanyDataSet) Me.SalesBindingNavigator.Fill(Me.CompanyDataSet.Sales) Me.SalesTableAdapter.Fill(Me.CompanyDataSet.Sales)Which of the following commands can be used to enable a disabled constraint? a. ALTER TABLE MODIFY b. ALTER TABLE ADD c. ALTER TABLE DISABLE d. ALTER TABLE ENABLE
