SQL 查詢 Python 腳本中的字符串格式

Question

我一直在嘗試為我正在構建的腳本的 SQL 查詢中的“colname”參數應用 f 字符串格式，但我不斷收到解析異常錯誤。 希望你能幫助我。

def expect_primary_key_have_relevant_foreign_key(spark_df1, spark_df2, colname):
  '''
  Check that all the primary keys have a relevant foreign key
  '''
  # Create Temporary View
  spark_df1.createOrReplaceTempView("spark_df1")
  spark_df2.createOrReplaceTempView("spark_df2")
  
  # Wrap Query in spark.sql
  result = spark.sql("""
                        select df1.*
                        from spark_df1 df1
                        left join
                        spark_df2 df2
                        f"on trim(upper(df1.{colname})) = trim(upper(df2.{colname}))"
                        f"where df2.{colname} is null"
                        """)
  
  if result == 0:
    print("Validation Passed!")
  else:
    print("Validation Failed!")
  
  return result

非常感謝

Answer 1

我找到了解決方案， f 在三引號 """ 之前為：

 # Wrap Query in spark.sql
  result = spark.sql(f"""
                        select df1.*
                        from spark_df1 df1
                        left join
                        spark_df2 df2
                        on trim(upper(df1.{colname})) = trim(upper(df2.{colname}))
                        where df2.{colname} is null
                        """)