eva.interfaces.relational.relation.EVARelation.select#
- EVARelation.select(expr: str) EVARelation [source]#
Projects a set of expressions and returns a new EVARelation.
- Parameters:
exprs (Union[str, List[str]]) – The expression(s) to be selected. If ‘*’ is provided, it expands to all columns in the current EVARelation.
- Returns:
A EVARelation with subset (or all) of columns.
- Return type:
EVARelation
Examples
>>> relation = conn.table("sample_table")
Select all columns in the EVARelation.
>>> relation.select("*")
Select all subset of columns in the EVARelation.
>>> relation.select("col1") >>> relation.select("col1, col2")