How Can I Create a Dynamic Pivot in Oracle SQL with Runtime-Generated Values?

Oracle SQL Dynamic Pivot Table: Tips for Generating Values ​​at Runtime

A common dilemma when using dynamic pivot tables in Oracle SQL is the need to manually update the pivot expression every time a new value is added to the data source. This manual process is time-consuming and error-prone.

To solve this problem, you can adopt a dynamic approach that automatically generates pivot expressions based on the available data. The specific method is as follows:

First, create a temporary string variable to hold the dynamic perspective expression. Using the COLUMN command, you can define a new temporary column named temp_in_statement to store the resulting pivot expression.

Next, use the COLUMN NEW_VALUE function along with the LISTAGG function to build a dynamic pivot expression in the temp_in_statement column. This expression will consist of different values ​​from the data source, separated by commas, plus appropriate aliases.

Once you have the dynamic pivot expression in the temp_in_statement column, you can reference it as a parameter in your PIVOT query. For example:

SELECT * FROM (
    SELECT myNumber, myLetter, myValue
    FROM myTable
)
PIVOT (Sum(myValue) AS val FOR myLetter IN (&str_in_statement));

In this query, the &str_in_statement placeholder will be replaced by the dynamic pivot expression stored in the temp_in_statement column. This allows you to perform pivot queries without manually updating the pivot expression.

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