CMPTR
3rd Edition
ISBN: 9781337681872
Author: PINARD
Publisher: Cengage
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- In the initial creation of a table, if a UNIQUE constraint is included for a composite column that requires the combination of entries in the specified columns to be unique, which of the following statements is correct? a. The constraint can be created only with the ALTER TABLE command. b. The constraint can be created only with the table-level approach. c. The constraint can be created only with the column-level approach. d. The constraint can be created only with the ALTER TABLE MODIFY command.arrow_forwardA table can have a maximum of how many PRIMARY KEY constraints?arrow_forwardYou’re creating a new table consisting of three columns: Col1, Col2, and Col3. Col1 should be the primary key and can’t have any NULL values, and each entry should be unique. Col3 must not contain any NULL values either. How many total constraints do you have to create? 1 2 3 4arrow_forward
- Which of the following is used to join data contained in two or more tables? a. primary key b. unique identifier c. common field d. foreign keyarrow_forwardAdd a constraint to make sure the Rep_ID value entered in the BOOK_STORES table is a valid value contained in the STORE_REPS table. The Rep_ID columns of both tables were initially created as different datatypes. Does this cause an error when adding the constraint? Make table modifications as needed so that you can add the required constraint.arrow_forwardWhat is the maximum number of PRIMARY KEY constraints allowed for a table? a. 1 b. 2 c. 30 d. 255arrow_forward
- When must a comma be used in the SELECT clause of a query? a. when a field name is followed by a column alias b. to separate the SELECT clause and the FROM clause when only one field is selected c. Its never used in the SELECT clause. d. when listing more than one field name and the fields arent concatenated e. when an arithmetic expression is included in the SELECT clausearrow_forwardThe FOREIGN KEY constraint should be added to which table? the table representing the “one” side of a one-to-many relationship the parent table in a parent-child relationship the child table in a parent-child relationship the table that doesn’t have a primary keyarrow_forwardCreate a view called HOMEWORK13 that includes the columns named Col1 and Col2 from the FIRSTATTEMPT table. Make sure the view is created even if the FIRSTATTEMPT table doesn’t exist.arrow_forward
- Update the VID_STATUS attribute of the VIDEO table using a subquery to set the VID_STATUS to OUT for all videos that have a null value in the DETAIL_ RETURNDATE attribute of the DETAILRENTAL table.arrow_forwardWhich command is used to create a table based on data already contained in an existing table?arrow_forwardAdd two columns to the EMPLOYEES table. One column, named EmpDate, contains the date of employment for each employee, and its default value should be the system date. The second column, named EndDate, contains employees date of termination.arrow_forward
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