Multiple choice technology platforms and products

Union query in oracle is same as Merge stage in Datastage

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oracle UNION and DataStage Merge serve different purposes. UNION combines result sets vertically by stacking rows, removing duplicates by default. DataStage Merge combines data horizontally based on key columns, acting more like a SQL JOIN. They are fundamentally different operations.

AI explanation

To answer this question, you need to understand the concepts of a union query in Oracle and the Merge stage in Datastage.

A union query in Oracle is used to combine the result sets of two or more SELECT statements into a single result set. It concatenates the rows from each SELECT statement and removes duplicate rows. The syntax for a union query in Oracle is as follows:

SELECT column1, column2, ...
FROM table1
UNION
SELECT column1, column2, ...
FROM table2;

On the other hand, the Merge stage in Datastage is used to merge data from two or more input sources based on a common key. It is commonly used for data integration and transformation purposes. The Merge stage allows you to combine data from multiple sources into a single output stream based on specified rules and conditions.

While both a union query in Oracle and the Merge stage in Datastage involve combining data from multiple sources, they have different purposes and functionalities.

Therefore, the correct answer is B) False. Union query in Oracle is not the same as the Merge stage in Datastage.

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