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- Logical Operators 12371
- The following logical operators are available: AND , OR and NOT . SQL uses a three-valued logic system with true , false and NULL . Note that logical operators involving NULL do not always evaluate to NULL . For example, NULL AND false will
... - https://man.mtool.work/duckdb/2.0/sql/expressions/logical_operators.html
- FROM and JOIN Clauses 8636
- The FROM clause specifies the source of the data on which the remainder of the query should operate. Logically, the FROM clause is where the query starts execution. The FROM clause can contain a single table, a combination of multiple table
...no match. mark Returns all rows of the left side along with a BOOLEAN column __mark_join_marker , which has the same three-valued result as an IN expression . single Returns all rows of the left side paired with their matching row from the right side (... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/from.html
- JSON Processing Functions 8303
- JSON Extraction Functions There are two extraction functions, which have their respective operators. The operators can only be used if the string is stored as the JSON logical type. These functions support the same two location notations as
...} SELECT md5(json_normalize('{"z": 1, "a": 2}')) = md5(json_normalize('{"a": 2, "z": 1}')) AS same_hash; true Remove null -valued keys recursively: SELECT json_strip_nulls('{"a": [{"x": 1, "y": null}, {"z": null}], "b": null}'); {"a":[{"x":1},{}]} JSON... - https://man.mtool.work/duckdb/2.0/data/json/json_functions.html
- Python Client API 7618
- Connection class duckdb. Appender Bases: object append_row ( self , * args ) → None Buffer one row, one value per column, each converted as an executemany parameter would be append_rows ( self , rows : object ) → None Buffer each row of an
...ion. Arguments: path, value. SQL: json_set . strip_nulls ( * args : ValueOrExpr ) → JsonExpr The document without its null-valued object fields. SQL: json_strip_nulls . structure ( * args : ValueOrExpr ) → JsonExpr The shape of the document, with types...ny ) Bases: Value class duckdb. BooleanValue ( object : Any ) Bases: Value class duckdb. DateValue ( object : Any ) Bases: Value duckdb. decimal_type ( width : int , scale : int , * , connection : _duckdb.DuckDBPyConnection | None = None ) → _duckdb._s.... DecimalValue ( object : Any , width : int , scale : int ) Bases: Value class duckdb. DoubleValue ( object : Any ) Bases: Value duckdb. dtype ( type_str : str , * , connection : _duckdb.DuckDBPyConnection | None = None ) → _duckdb._sqltypes.DuckDBPyTy... - https://man.mtool.work/duckdb/2.0/clients/python/reference/
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