Question
Which symbol is used for logical AND in shell
scripting?Solution
&& allows execution of the next command only if the previous command succeeds.
A materialized view differs from a normal view because it:
Which SQL function is used to calculate the average of a numeric column?
ROW_NUMBER() OVER (PARTITION BY dept ORDER BY salary DESC) assigns:
Which SQL keyword prevents duplicate rows in result?
Which SQL command is used to remove a table completely?
What is an SQL `VIEW`?
Which SQL constraint ensures a column cannot have NULL values?
Materialized views differ from normal views because:
In PL/SQL, what type of parameter allows a procedure to both receive a value from the calling environment and return a modified value back to it?
Which type of trigger fires once for each row affected by the triggering DML statement?
