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Applies to: 
Databricks SQL Databricks Runtime
Returns the date numDays before startDate.
Syntax
date_sub(startDate, numDays)
Arguments
startDate: A DATE expression.numDays: An INTEGER expression.
Returns
A DATE.
If numDays is negative abs(num_days) are added to startDate.
If the result date overflows the date range the function raises an error.
Examples
> SELECT date_sub('2016-07-30', 1);
2016-07-29