ClickHouse/docs/en/sql-reference/aggregate-functions/reference/last_value.md

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/en/sql-reference/aggregate-functions/reference/last_value	8

first_value

Selects the last encountered value, similar to anyLast, but could accept NULL.

examples

insert into test_data (a,b) values (1,null), (2,3), (4, 5), (6.null)

example1

The NULL value is ignored at default.

select last_value(b) from test_data

┌─last_value(b)─┐
│             5 │
└───────────────┘

example2

The NULL value is ignored.

select last_value(false)(b) from test_data

┌─last_value(false)(b)─┐
│                    5 │
└──────────────────────┘

example3

The NULL value is accepted.

select last_value(true)(b) from test_data

┌─last_value(true)(b)─┐
│                ᴺᵁᴸᴸ │
└─────────────────────┘