查询本月
where a.create_time between datetime('now','start of month','+1 second') and
datetime('now','start of month','+1 month','-1 second')
查询多少天之内
where julianday(datetime('now','localtime'))-julianday(a.create_time) <300
这明白的就是和sqlserver 干啊 连个datediff都没有
