last_value
Selects the last encountered value, similar to anyLast
, but could accept NULL.
Mostly it should be used with Window Functions.
Without Window Functions the result will be random if the source stream is not ordered.
examples
Example 1
The NULL value is ignored at default.
Example 2
The NULL value is ignored.
Example 3
The NULL value is accepted.
Example 4
Stabilized result using the sub-query with ORDER BY
.