An account starts at 1000. A serializable execution is equivalent to this order: T2 withdraws 150; T1 deposits 20% of the balance it reads; T3 deposits 10% of the balance it reads. Each percentage calculation is an exact integer. What is the final balance?

Stonebraker’s 1981 paper argues that UNIX-style file organization can leave a DBMS maintaining its own access tree on top of file-system block and directory trees, and that a more unified lower-level structure could be more efficient.

Consider Employees(EmployeeID, Name, Department, Salary). The projection operator π selects columns. For example, π_X(Employees) keeps only the columns listed in set X, removing duplicate rows under the relational model. Let X = {Name, Department} and Y = {Department, Salary}. True or False: Applying π_X followed by π_Y – or applying them in the reverse order – is valid and produces a table containing Name, Department, and Salary.

Users(UserID, Location) contains (1, Paris), (2, Mumbai), and (3, Paris). Posts has UserID values 1, 1, 2, 4, and 3. After an inner join on UserID, the plan projects only Location but has not eliminated duplicates. How many output tuples does the projection produce?

Parallel index construction can assign disjoint input-page ranges to different worker threads.

When a graph or table in a research article seems complex, what is the recommended approach?

Which section of a research article describes how the researchers investigated their research question, including who took part and how data were collected?

A research team is designing a study of a new reading program. As they plan, they weigh how often students need to be assessed to monitor their progress against the risk of assessment fatigue. Which Belmont Report principle guides this consideration?

What is the main role of an Institutional Review Board (IRB)?

Sección auditiva a Listen to the audio. Then indicate if the following sentences are ture or false. Write in the space provided “Verdadero” for true or “Falso” for false. Span 101 Unit 3and4 test.mp3 Verdadero = true Falso = false. 1. José estudia veterinaria. [BLANK-1] 2. Ana desea ser arquitecta. [BLANK-2] 3. Ana y José son hermanos. [BLANK-3] 4. José es de Ecuador. [BLANK-4]