执行时输入结束时出现 psycopg2 语法错误

Question

我在执行查询时在输入结束时收到 psycopg2 语法错误，但我无法弄清楚。我试图在执行函数中编写查询，因为它没有帮助。 我在网上搜索了我的案例的解决方案，但没有任何帮助..

错误是： "" "" 处或附近的语法错误 第 1 行：...“WHERE first_name = 'Eyal'”... ^

select_query = """ SELECT first_name, value " \
                         "FROM PATIENTS " \
                         " WHERE first_name = %s " \
                         " AND valid_start_time IN (SELECT MAX(valid_start_time) " \
                                                    " FROM PATIENTS " \
                                                    " WHERE first_name = %s AND " \
                                                    " valid_start_time::DATE = %s " \
                                                    " AND transaction_time::DATE < %s """


          cursor.execute(select_query, (first_name, first_name, wanted_date[0], prespective_date,))

Answer 1

您的查询缺少最后一个右括号（将关闭SELECT MAX(...) 子查询的那个），因此“输入末尾的语法错误”。

select_query = """
SELECT first_name, value
FROM PATIENTS
WHERE first_name = %s AND valid_start_time IN (
  SELECT MAX(valid_start_time)
  FROM PATIENTS
  WHERE first_name = %s AND valid_start_time::DATE = %s AND transaction_time::DATE < %s
)
"""

应该会更好（如果你问我，使用单个 """ 字符串更具可读性）。