MySql查询获取两次行

Question

我有以下查询。

select a.nume_echipament,
       a.producator,
       a.seria,
       b.uc,
       b.port,

       (select starea from echipamente order by data desc, ora desc limit 1) as starea,

       a.durata_aprovizionare,
       a.durata_viata,
      ( select data_aprov from aprovizionari where nume_echipament='automat_imbuteliere' order by date(data_aprov) desc, time(ora_aprov) desc limit 1) as data_aprov,


      ( select ora_aprov from aprovizionari where nume_echipament='automat_imbuteliere' order by date(data_aprov) desc, time(ora_aprov) desc limit 1) as ora_aprov,
       sec_to_time(count(starea)*5)  as durata_totala 

       from date_tehnice a
       inner join echipamente b on a.nume_echipament=b.nume_echipament
       inner join aprovizionari c on c.nume_echipament=a.nume_echipament
       where a.nume_echipament='automat_imbuteliere'
       and
       b.starea='1'
       and
       b.data > c.data_aprov
       and
       b.ora >c.ora_aprov   
       ;

问题是它取两次行。它会影响我的'durata_totala'（总生命期）变量，因为我没有得到例如00:00:05，而是00:00:10。 我有一个表，其中'1'表示设备打开，否则为0。 这就是为什么我有数（starea * 5）。因为我的arduino每5秒向数据库发送一次数据。

有人可以帮我解决问题吗？