OMIS 452 Questions and Answers 2025
Expert Verified | Ace the Test
A user creates a table by using a SQL statement. The data type
VARCHAR(11) is part of the statement. What does the value of (11)
represent? - 🧠 ANSWER ✔✔The number of characters allowed for the data
type.
How does a database system protect data when concurrent transactions
occur? - 🧠 ANSWER ✔✔Preventing multiple transactions with the same
data at the same time.
Redundancy is possible in a _____ normal form table when one non-key
column depends on another non-key column. - 🧠 ANSWER ✔✔second
, The EmployeeWorkspace table has a composite key of (EmployeeID,
WorkspaceID). WorkHours depends on (EmployeeID, WorkspaceID), and
EmployeeLastName depends on EmployeeID. Which column must be
removed so EmployeeWorkspace is in second normal form? - 🧠 ANSWER
✔✔WorkspaceID
A foreign key in which all columns are NULL is known as a _____ foreign
key? - 🧠 ANSWER ✔✔fully NULL
What data type stores binary values? - 🧠 ANSWER ✔✔BLOB
Which data type should a database use to store negative numbers? - 🧠
ANSWER ✔✔INT
Which concept relates to software that reads and writes data in a
database? - 🧠 ANSWER ✔✔Management system
which relational algebra operation is denoted by the greek letter p - 🧠
ANSWER ✔✔Rename
In a relational database model, an attribute refers to which concept? - 🧠
ANSWER ✔✔A uniquely named tuple position
Expert Verified | Ace the Test
A user creates a table by using a SQL statement. The data type
VARCHAR(11) is part of the statement. What does the value of (11)
represent? - 🧠 ANSWER ✔✔The number of characters allowed for the data
type.
How does a database system protect data when concurrent transactions
occur? - 🧠 ANSWER ✔✔Preventing multiple transactions with the same
data at the same time.
Redundancy is possible in a _____ normal form table when one non-key
column depends on another non-key column. - 🧠 ANSWER ✔✔second
, The EmployeeWorkspace table has a composite key of (EmployeeID,
WorkspaceID). WorkHours depends on (EmployeeID, WorkspaceID), and
EmployeeLastName depends on EmployeeID. Which column must be
removed so EmployeeWorkspace is in second normal form? - 🧠 ANSWER
✔✔WorkspaceID
A foreign key in which all columns are NULL is known as a _____ foreign
key? - 🧠 ANSWER ✔✔fully NULL
What data type stores binary values? - 🧠 ANSWER ✔✔BLOB
Which data type should a database use to store negative numbers? - 🧠
ANSWER ✔✔INT
Which concept relates to software that reads and writes data in a
database? - 🧠 ANSWER ✔✔Management system
which relational algebra operation is denoted by the greek letter p - 🧠
ANSWER ✔✔Rename
In a relational database model, an attribute refers to which concept? - 🧠
ANSWER ✔✔A uniquely named tuple position
