pyspark.sql.SparkSession.sql

SparkSession.sql(sqlQuery: str, args: Dict[str, str] = {}, **kwargs: Any) → pyspark.sql.dataframe.DataFrame

Returns a DataFrame representing the result of the given parameterized query. When kwargs is specified, this method formats the given string by using the Python standard formatter.

Parameters

sqlQuerystr

SQL query string.

argsDict[str,str]

A dictionary of named parameters that begin from the : marker and the corresponding SQL literals for substitution. Read the list of supported literals for options.

kwargsdict

Other variables that the user wants to set that can be referenced in the query.

Added optional argument kwargs to specify the mapping of variables in the query. This feature is experimental and unstable.

Returns

DataFrame

Examples

Executing a SQL query.

>>> spark.sql("SELECT * FROM range(10) where id > 7").show()
+---+
| id|
+---+
|  8|
|  9|
+---+

Executing a SQL query with variables as Python formatter standard.

>>> spark.sql(
...     "SELECT * FROM range(10) WHERE id > {bound1} AND id < {bound2}", bound1=7, bound2=9
... ).show()
+---+
| id|
+---+
|  8|
+---+

>>> mydf = spark.range(10)
>>> spark.sql(
...     "SELECT {col} FROM {mydf} WHERE id IN {x}",
...     col=mydf.id, mydf=mydf, x=tuple(range(4))).show()
+---+
| id|
+---+
|  0|
|  1|
|  2|
|  3|
+---+

>>> spark.sql('''
...   SELECT m1.a, m2.b
...   FROM {table1} m1 INNER JOIN {table2} m2
...   ON m1.key = m2.key
...   ORDER BY m1.a, m2.b''',
...   table1=spark.createDataFrame([(1, "a"), (2, "b")], ["a", "key"]),
...   table2=spark.createDataFrame([(3, "a"), (4, "b"), (5, "b")], ["b", "key"])).show()
+---+---+
|  a|  b|
+---+---+
|  1|  3|
|  2|  4|
|  2|  5|
+---+---+

Also, it is possible to query using class:Column from DataFrame.

>>> mydf = spark.createDataFrame([(1, 4), (2, 4), (3, 6)], ["A", "B"])
>>> spark.sql("SELECT {df.A}, {df[B]} FROM {df}", df=mydf).show()
+---+---+
|  A|  B|
+---+---+
|  1|  4|
|  2|  4|
|  3|  6|
+---+---+

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