# timestamp_null¶

## Description¶

Returns a null value of type timestamp. This is important, because some functions, like case(), return more convenient outputs if all their arguments are of the same type.

timestamp

## Domain¶

This is a scalar function (calculates a single output value for a single input row.)

## Usage¶

timestamp_null( )


## Examples¶

make_col positive_or_null:case(x > 0, x, true, timestamp_null())


Create a column ‘positive_or_null’ which is either a positive timestamp, or the null timestamp.