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Questions and Answers
What is the correct SQL command to add data to a table?
What is the correct SQL command to add data to a table?
- CREATE
- UPDATE
- INSERT (correct)
- ALTER
What is the normal form achieved when a primary key is defined?
What is the normal form achieved when a primary key is defined?
- 1NF (correct)
- 2NF
- Boyce-Codd Normal Form
- 3NF
What type of index uses a single root node to point to multiple data pages?
What type of index uses a single root node to point to multiple data pages?
- unique index
- nonclustered index
- clustered index (correct)
- hashed index
What clause is used with the SELECT command to pull records based on a specific range of values?
What clause is used with the SELECT command to pull records based on a specific range of values?
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What is the primary purpose of an index in a database?
What is the primary purpose of an index in a database?
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Study Notes
Database Operations
- To add data to a table, use the
INSERTstatement. ADDis not a valid statement for adding data to a table.
Normalization Levels
- Defining a primary key reaches the level of 1NF (First Normal Form).
- Primary key definition does not necessarily imply reaching 2NF, 3NF, or 4NF.
Index Types
- A clustered index uses pointers that point to row location.
- A nonclustered index is a type of index that does not store data in a particular order.
- There is no such type of index as quick index or primary index in relational databases.
SELECT Clause
- The
BETWEENclause is used with theSELECTcommand to pull records based on a range. - There is no
COMBOorCOMBINEclause in SQL.
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