Expr.is_unique

methodView source ↗

def is_unique() -> Expr

Categories: logic

If an element value is unique for all values in the column.

Examples

>>> import tabsdata as td
>>>
>>> tf: td.TableFrame ...
>>>
>>> tf = tf.select(td.col("temp"), td.col("temp").is_unique()
>>>        .alias("unique"))
>>>
┌──────┬──────────┐
│ temp ┆ unique   │
│ ---  ┆ ---      │
│ f64  ┆ bool     │
╞══════╪══════════╡
│ 1.1  ┆ false    │
│ 1.1  ┆ false    │
│ None ┆ true     │
│ 2.0  ┆ true     │
└──────┴──────────┘