Answer / priya

"PL/SQL sends SQL statements such as DML and queries to the
SQL engine for execution, and SQL returns the results to
PL/SQL. You can minimize the performance overhead of this
communication between PL/SQL and SQL by using the PL/SQL
features that are known collectively as bulk SQL.

The FORALL statement sends INSERT, UPDATE, or DELETE
statements in batches, rather than one at a time. The BULK
COLLECT clause brings back batches of results from SQL. If
the DML statement affects four or more database rows, bulk
SQL can improve performance considerably.

Bulk SQL uses PL/SQL collections to pass large amounts of
data back and forth in single operations. This process is
called bulk binding. If the collection has n elements, bulk
binding uses a single operation to perform the equivalent of
n SELECT INTO, INSERT, UPDATE, or DELETE statements. A query
that uses bulk binding can return any number of rows,
without requiring a FETCH statement for each one."

SELECT emp_num, years, SUM(salary) FROM sales UNION ALL SELECT emp_id, SUM(takehomepay) FROM marketing What error is present in the sample code above? 1. Queries being combined with the UNION ALL statement are not allowed to have SELECT lists with a different number of expressions. 2. You are not allowed to use aggregate functions within two queries joined by a UNION ALL statement. 3. The UNION ALL statement incorrectly combines the "years" result from the first query with the "SUM (takehomepay)" result from the second query. 4. Unless the UNION ALL statement is replaced with a UNION statement, the queries will return duplicates. 5. The "emp_id" column from the second query must be renamed (or aliased) as "emp_num" so that it corresponds to the column name from the first query. Otherwise, the queries will not execute.

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