evadb.EvaDBQuery.select#

EvaDBQuery.select(expr: str) → EvaDBQuery[source]#

Projects a set of expressions and returns a new EvaDBQuery.

Parameters:: exprs (Union[str, List[str]]) – The expression(s) to be selected. If ‘*’ is provided, it expands to all columns in the current EvaDBQuery.
Returns:: A EvaDBQuery with subset (or all) of columns.
Return type:: EvaDBQuery

Examples

>>> relation = conn.table("sample_table")

Select all columns in the EvaDBQuery.

>>> relation.select("*")

Select all subset of columns in the EvaDBQuery.

>>> relation.select("col1")
>>> relation.select("col1, col2")