没有与给定名称和参数类型匹配的函数。在postgres中使用python
python代码:没有与给定名称和参数类型匹配的函数。在postgres中使用python,python,sql,postgresql,count,aggregate-functions,Python,Sql,Postgresql,Count,Aggregate Functions,python代码: if aggregate_name and aggregate_value and aggregate_type: query = "SELECT SUM(country) FROM soubhagyasalesdata GROUP BY ordernumber" print(query) else: query = "SELECT * FROM {}".format(ta
if aggregate_name and aggregate_value and aggregate_type:
query = "SELECT SUM(country) FROM soubhagyasalesdata GROUP BY ordernumber"
print(query)
else:
query = "SELECT * FROM {}".format(table_name)
错误:
UndefinedFunction at /api/datasets/reports/
function sum(text) does not exist
LINE 1: SELECT SUM(country) FROM soubhagyasalesdata GROUP BY ordernu...
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
在这里,我尝试使用python从我的postgres数据库进行查询
但是,我开始犯错误了
请看一看您不能像预期的那样对字符串值求和。如果要计算表中每个订单号的不同国家/地区的数量,请使用
count(distinct)
:
你想干什么
country
是一个字符串,不能求和。
SELECT ordernumber, COUNT(DISTINCT country) cnt_country
FROM soubhagyasalesdata
GROUP BY ordernumber