以下python语句sql = """ SELECT date_z, SUM(COUNT(*) + IFNULL(nn, 0)) FROM ( SELECT id_person, date_z, date_finish FROM luzhi_jilu_all WHERE id_person = %s AND (date_z = date_finish OR date_finish IS NULL) ) AS t1 LEFT JOIN ( SELECT id_person, date_finish, COUNT(*) AS nn FROM luzhi_jilu_all GROUP BY id_person, date_finish ) AS t2 ON t1.id_person = t2.id_person AND t1.date_z = t2.date_finish GROUP BY date_z ORDER BY date_z DESC """ params = (id_person,) cs.execute(sql, params) jg = cs.fetchall()出现以下错误提示,请检查,并给出修改pymysql.err.ProgrammingError: (1111, 'Invalid use of group function')

这个错误通常表示 SQL 查询中使用了无效的聚合函数。具体地说，它可能是由于在查询语句中使用了 `SUM()` 函数而没有正确地将其与 `GROUP BY` 子句结合使用造成的。

可以尝试检查 `GROUP BY` 子句的正确性，以及聚合函数的使用方式是否正确。在这个查询中，`SUM()` 函数与 `GROUP BY` 子句结合使用了，但是可能需要检查查询中是否有其他聚合函数的使用方式存在问题，导致出现了这个错误。

相关问题

以下python语句sql = """ SELECT date_z, COUNT(*) + IFNULL(nn, 0) FROM ( SELECT id_person, date_z, date_finish FROM luzhi_jilu_all WHERE id_person = %s AND (date_z = date_finish OR date_finish IS NULL) ) AS t1 LEFT JOIN ( SELECT id_person, date_finish, COUNT(*) AS nn FROM luzhi_jilu_all GROUP BY id_person, date_finish ) AS t2 ON t1.id_person = t2.id_person AND t1.date_z = t2.date_finish GROUP BY date_z ORDER BY date_z DESC """ params = (id_person,) cs.execute(sql, params) jg = cs.fetchall()提示出现以下错误pymysql.err.InternalError: (1055, "Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 't2.nn' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by"),请检查错误,并修改

这个错误是由于 MySQL 的 sql_mode=only_full_group_by 模式导致的。在这种模式下，如果 SELECT 语句中的列不在 GROUP BY 子句中，那么这些列必须是聚合函数的参数，或者在 SELECT 子句中使用 IFNULL、CASE 等函数来进行处理。因为在 GROUP BY 子句中聚合分组依赖于 SELECT 子句中的列，如果 SELECT 子句中的列没有在 GROUP BY 子句中出现，那么这些列的值在聚合时是不确定的。

对于这段 SQL 语句，错误出现在 SELECT 子句中的第二个列，即 COUNT(*) + IFNULL(nn, 0)。这个列没有在 GROUP BY 子句中出现，也不是聚合函数的参数，因此需要使用一个聚合函数来处理它。你可以把这个列替换为 SUM(COUNT(*) + IFNULL(nn, 0))，这样就可以避免这个错误了。

修改后的 SQL 语句如下：

sql = """
SELECT date_z, SUM(COUNT(*) + IFNULL(nn, 0))
FROM (
SELECT id_person, date_z, date_finish
FROM luzhi_jilu_all
WHERE id_person = %s AND (date_z = date_finish OR date_finish IS NULL)
) AS t1
LEFT JOIN (
SELECT id_person, date_finish, COUNT(*) AS nn
FROM luzhi_jilu_all
GROUP BY id_person, date_finish
) AS t2 ON t1.id_person = t2.id_person AND t1.date_z = t2.date_finish
GROUP BY date_z
ORDER BY date_z DESC
"""

params = (id_person,)
cs.execute(sql, params)
jg = cs.fetchall()

以下python语句sql = """ SELECT date_z, SUM(COUNT() + IFNULL(nn, 0)) FROM ( SELECT id_person, date_z, date_finish FROM luzhi_jilu_all WHERE id_person = %s AND (date_z = date_finish OR date_finish IS NULL) ) AS t1 LEFT JOIN ( SELECT id_person, date_finish, COUNT() AS nn FROM luzhi_jilu_all GROUP BY id_person, date_finish ) AS t2 ON t1.id_person = t2.id_person AND t1.date_z = t2.date_finish GROUP BY date_z ORDER BY date_z DESC """ params = (id_person,) cs.execute(sql, params) jg = cs.fetchall()出现以下错误提示,请检查,并给出修改pymysql.err.ProgrammingError: (1111, 'Invalid use of group function')

这个错误通常是由于 SQL 语句中的 GROUP BY 子句中出现了聚合函数（如 COUNT()）导致的。在这种情况下，你需要将聚合函数移除 GROUP BY 子句，或者将它们放在一个子查询中。你可以尝试以下修改：

sql = """
    SELECT date_z, SUM(cnt)
    FROM (
        SELECT id_person, date_z, 
            COUNT(*) + IFNULL(nn, 0) AS cnt
        FROM (
            SELECT id_person, date_z, date_finish
            FROM luzhi_jilu_all
            WHERE id_person = %s 
                AND (date_z = date_finish OR date_finish IS NULL)
        ) AS t1
        LEFT JOIN (
            SELECT id_person, date_finish, COUNT(*) AS nn
            FROM luzhi_jilu_all
            GROUP BY id_person, date_finish
        ) AS t2 ON t1.id_person = t2.id_person 
            AND t1.date_z = t2.date_finish
        GROUP BY id_person, date_z
    ) AS t3
    GROUP BY date_z
    ORDER BY date_z DESC
"""
params = (id_person,)
cs.execute(sql, params)
jg = cs.fetchall()

在这个修改后的语句中，我们将 COUNT() 和 IFNULL() 函数放在了子查询中，并且在最终的外部查询中使用了 SUM() 函数来计算结果。同时，我们在子查询中也加入了 GROUP BY 子句以避免出现聚合函数在 GROUP BY 子句中的错误使用。