Question

使用此查询我的目标是从子查询中的另一个表中检索数据，其中参数比较unixtime戳。但是我的第三个圆柱（'有效'）的结果仍然是空的？

SELECT COUNT( valid.call_id )FROM calls AS valid WHERE SECOND((
SELECT conf.cca_setvalidtime FROM user_conf AS conf        
WHERE MONTH(FROM_UNIXTIME(conf.activ_date)) = MONTH(FROM_UNIXTIME(valid.last_call ))        
    )) < SECOND( valid.call_duration )

) AS 'valid'
FROM calls
GROUP BY EXTRACT(
YEAR_MONTH FROM last_call )

Answer 1

对于任何需要类似东西的人来说，这是解决方案; - ）

SELECT DATE_FORMAT( last_call, '%M' ) AS 'month', COUNT( call_id ) AS 'total', (

SELECT COUNT( valid.call_id )
FROM calls AS valid
WHERE TIME((


SELECT conf.cca_setvalidtime FROM user_conf AS conf        
WHERE EXTRACT(YEAR_MONTH FROM conf.activ_date ) = EXTRACT(YEAR_MONTH FROM valid.last_call ) AND conf.for_role=1



)) < TIME( valid.call_duration )
AND EXTRACT(
YEAR_MONTH FROM valid.last_call ) = EXTRACT(
YEAR_MONTH FROM calls.last_call )
) AS 'valid'
FROM calls
GROUP BY EXTRACT(
YEAR_MONTH FROM last_call )

通过每行的时间戳匹配字段在子选择中检索结果

1 个答案: