APEX 4.2.5: How reference a column element in the previous line?

Good afternoon

I have the following problem:

I have an IR on a table that contains the values of daily clock of energy (gas and electricity).

Now, I want to set up a calculated column that contains the daily consumption.
Power_actual_row - power_previous line.

Is this possible and if yes how can I achieve this?

Kind regards.

Wilfried

Baerenmarke wrote:

I have the following problem:

I have an IR on a table that contains the values of daily consumption of energy (gas & electricity) clock.

Now, I want to set up a calculated column that contains the daily consumption.
Power_actual_row - power_previous line.

Is this possible and if yes how can I achieve this?

Add a POWER_PREVIOUS column to your report query using the analytical function LAG to access the value of the POWER of the previous row. Use the ORDER byclause in the function to determine the order of the lines. The calculation of the IR then simply uses the POWER and POWER_PREVIOUS values for the same line.

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