Databricks 將 Python 參數多次傳遞到循環的 SQL 腳本中

Question

我正在嘗試創建一個包含多個變量的 python 列表，然后這些變量將用作 for 循環中的值，該循環通過創建多個表的 sql 查詢進行循環，但我似乎找不到一個顯示多個使用的參數的示例次。

list = ["a","b","c"]
for x in list:
sql = ''' 
create volatile table test_{} as (
select * from database.tablename_{}
) with data on commit preserve rows;

create volatile table test2_{} as (
select * from database.tablename2_{}
) with data on commit preserve rows;
'''
display(sql)

Answer 1

您可以使用所謂的f 字符串（自 Python 3.6 起）將相同的變量插入多個位置：

list = ["a","b","c"]
for x in list:
    sql = f'''
create volatile table test_{x} as (
select * from database.tablename_{x}
) with data on commit preserve rows;

create volatile table test2_{x} as (
select * from database.tablename2_{x}
) with data on commit preserve rows;
'''
    print(sql)

或者您可以使用帶編號占位符的format

list = ["a","b","c"]
for x in list:
    sql = '''
create volatile table test_{0} as (
select * from database.tablename_{0}
) with data on commit preserve rows;

create volatile table test2_{0} as (
select * from database.tablename2_{0}
) with data on commit preserve rows;
'''.format(x)
    print(sql)