Which function returns the value of an expression from the previous input record?

The function that retrieves the value of an expression from the previous input record is the Previous function. This function is particularly useful in data loading scripts where you want to compare current records with those that were processed immediately before them.

When you use the Previous function in your script, it refers to the value of the specified field from the last row of data that has been read into the memory. This capability allows you to perform calculations or carry forward values from one record to the next dynamically, enabling a form of row-wise operations.

In contrast, the Peek function is designed to access the value of a field from a previous record based on the record's index rather than strictly the preceding one. It is also commonly used but serves a slightly different purpose because it allows for a more flexible retrieval of past record values, not limited to the immediately previous one.

The other two options, the Force function and the GeoMakePoint function, do not serve the purpose of accessing values from previous records. The Force function is not standardized in Qlik Sense terminology, while GeoMakePoint is intended for geographical point creation rather than record traversal.

Understanding how the Previous function works is crucial for processing time series data or situations requiring the sequential evaluation of records. This helps in creating cumulative