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Oracle Database 23ai SQL Associate Sample Questions:

1. Which command grants a user the ability to query data from a specific table?

A) GRANT ALL ON table_name TO user_name;
B) GRANT SELECT ON table_name TO user_name;
C) ENABLE SELECT ON table_name TO user_name;
D) ALLOW SELECT ON table_name TO user_name;

2. What is the primary purpose of an index in SQL?

A) To ensure uniqueness of values in a column
B) To enforce data integrity constraints
C) To store metadata about a table
D) To improve the performance of data retrieval queries

3. What does the NEXTVAL pseudocolumn do in SQL?

A) Retrieves the current value of a sequence without incrementing it
B) Deletes the sequence from the database
C) Resets the sequence to its starting value
D) Retrieves the next value in a sequence and increments the sequence

4. What happens when a unique index is created on a table column?

A) The column can only contain NULL values.
B) The column cannot contain duplicate values.
C) The column values are automatically encrypted.
D) The column data type is converted to a primary key.

5. How are NULL values treated in relational databases?

A) NULL values represent missing or unknown data.
B) NULL values are not allowed in relational databases.
C) NULL values are treated as zero.
D) NULL values are treated as empty strings.

Solutions: