asc_nulls_first (Column)

Sort the column in ascending order with null values appearing first.

Syntax

asc_nulls_first()

Returns

Column

Examples

from pyspark.sql import Row
df = spark.createDataFrame(
    [('Tom', 80), (None, 60), ('Alice', None)], ["name", "height"])
df.select(df.name).orderBy(df.name.asc_nulls_first()).collect()

# [Row(name=None), Row(name='Alice'), Row(name='Tom')]