Question
Query optimization heuristics often include:
More IT DBMS Questions
- A PL/SQL `TRIGGER` is a stored program that automatically executes in response to:
- Which of the following database models represents data as a collection of tables, where each table consists of rows and columns?
- In a relational database, what is a foreign key?
- Which type of join returns only matching records from both tables?
- Bitmap indexes are most efficient when:
- Which database model represents data in a tree-like structure, where each child record has only one parent?
- ACID properties in DBMS ensure:
- What is referential integrity?
- Which type of SQL JOIN returns all rows from both tables involved, placing NULLs in columns where there is no matching row on the other side?
- Given a relation R(A, B, C, D, E) and functional dependencies {A -> B, BC -> D, D -> E}. Which of the following is a candidate key for R?
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