What am I doing wrong?

What am I doing wrong?
The preview screen says: Number of Columns for series and Number of series should be equal

Hi Moisés

In query you have selected only one column to create the line chart. To draw line chart through sql query, we consider first column for horizontal value,remaining columns will be consider for series.The query you have written, have only one column , you have not given any column for series values because of this, it is showing this "Number of Columns for series and Number of series should be equal" message.

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thanks
zaheer

Thank you very much