How does Oracle order the result of WM_CONCAT?

2 years ago
Olivia Parker
1 minute

In Oracle, the WM_CONCAT function can concatenate multiple row values from a column into a single string. However, it does not guarantee that the order of the returned string will match the order of the original data. If you need to concatenate data in a specific order, you can use a subquery and the ORDER BY clause to achieve this. Here is an example:

SELECT column1, WM_CONCAT(column2) AS concatenated_values
FROM (
    SELECT column1, column2
    FROM your_table
    ORDER BY column1, column2
) subquery
GROUP BY column1;

In the example above, the original data is first sorted and then concatenated in order using the WM_CONCAT function.

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