Find the angle between the lines whose direction ratios

Which of the following statements about SQL `INDEXES` is generally TRUE?

Which of the following can be used to avoid duplicate entries in a column?

Which SQL clause is used to filter records based on aggregate functions?

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?

In SQL, the ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW clause applies to:

Which SQL constraint ensures that a column’s values are unique across the table?

Which SQL operator is used to search for a pattern in a column?

Which operator is used to combine results of two SELECT queries and remove duplicates?

Which SQL statement combines the results of two queries and removes duplicates?

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?