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<b><code>arg</code></b>: the field from which to fetch the previous value.

1. <b><code>arg</code></b>: the field from which to fetch the previous value.

LAG(<code>Value</code>) with Row Offset 1

Get the value of a specified field from a previous row in the dataset

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Description	The `LAG()` function returns the value of a specified field from a previous row in the dataset. It is useful for comparing current values to previous ones.
Syntax	LAG(`ag`)
Output	Varies based on input field type