mysql - 如何将 mysql 查询更改为 postgresql 查询

Question

当我在 postgresql 中执行 mysql 查询时，它显示错误。我在 google 中搜索了该错误，但它们对我不起作用。请建议我解决。

下面是mysql查询:

SELECT caller_id_number,
       caller_id_name,
       dialed_number,
       count(*) NumberOfCalls,
       round(sum(duration_seconds)/60,2) CallDurationMin
FROM kazoo_cdr_rpt
WHERE cdr_date_time > '20-08-2017'
    AND cdr_date_time < 24-08-2017
    AND length(caller_id_number) < 5
    AND direction = "outbound"
GROUP BY dialed_number;

当我在 postgres 中执行上述查询时，它收到的错误为

 round(sum(durati...
                                                             ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.

Answer 1

如果您的持续时间秒为 varchar，则必须将其转换为数字:

SELECT caller_id_number,
       caller_id_name,
       dialed_number,
       count(*) NumberOfCalls,
       round(sum(CAST(duration_seconds as numeric))/60,2) CallDurationMin
FROM kazoo_cdr_rpt
WHERE cdr_date_time > '20-08-2017'
    AND cdr_date_time < '24-08-2017'
    AND length(caller_id_number) < 5
    AND direction = "outbound"
GROUP BY caller_id_number, caller_id_name, dialed_number;