Single column dynamic pivot - syntax error

Grateful for any guidance. I'm seeing the syntax error below and I can't figure out why. New to MySQL Transforms as my previously relied upon python scripts are to be deprecated.
Objective
To take a single column of dates and turn them into column headers. Once pivoted, row value(s) are irrelevant (they'll be overwritten later).
Desired Result
Input Dataset
The MySQL Dataflow
/
Dynamic Reverse Pivot
/
CREATE PROCEDURE Pivot()
BEGIN
SET @sql = NULL;
SELECT GROUP_CONCAT(DISTINCT CONCAT('MAX(CASE WHEN dt = ''',dt,''' THEN ''',y,''' ELSE 0) AS ''', dt,''' ')) INTO @sql FROM preformat;
SET @sql = CONCAT('SELECT p.y,', @sql, 'FROM preformat p GROUP BY p.y');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END
The Error
Best Answer
-
@har_d_har1 Before you do that, I recommend reading this Knowledge Base article on Gantt chart cards, which provides guidance on how to structure data for these types of visualizations:
0
Answers
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@har_d_har1 I generally advise against pivoting by date in a dataflow because it is very cumbersome to manipulate a constantly growing number of columns. May I ask how you intend to use this data so we can suggest another transformation method?
0 -
@MichelleH The data will be used to generate a card like this. What I have going in are start and end dates of various activities, and a total amount of effort to complete the activity. I'll want to display each activity in its own row in the chart.
I'm aware of the issues with removing/adding table columns via ETL, so I create the dataset with two years of columns, and change the date columns once a year
0 -
@har_d_har1 Before you do that, I recommend reading this Knowledge Base article on Gantt chart cards, which provides guidance on how to structure data for these types of visualizations:
0
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