Mysql查询：计数列

大家好，我有一个技术问题，我有一张表，上面有这样的记录：

DATE        SIP DURATION  TYPE
2017-02-22  670    9      NO ANSWER
2017-02-22  670    9      ANSWER
2017-02-22  670    9      ANSWER
2017-02-22  671    9      NO ANSWER

SIP   DURATION  NOANSWER  ANSWER
670     18         1        2
671     9          1        0

select 
DISTINCT(SIP),
(select count(*) FROM table where TYPE="ANSWERED")
(select count(*) FROM table where TYPE="NO ANSWERED")
from table

我希望得到这样的结果：

DATE        SIP DURATION  TYPE
2017-02-22  670    9      NO ANSWER
2017-02-22  670    9      ANSWER
2017-02-22  670    9      ANSWER
2017-02-22  671    9      NO ANSWER

SIP   DURATION  NOANSWER  ANSWER
670     18         1        2
671     9          1        0

select 
DISTINCT(SIP),
(select count(*) FROM table where TYPE="ANSWERED")
(select count(*) FROM table where TYPE="NO ANSWERED")
from table

我将这样进行查询：

DATE        SIP DURATION  TYPE
2017-02-22  670    9      NO ANSWER
2017-02-22  670    9      ANSWER
2017-02-22  670    9      ANSWER
2017-02-22  671    9      NO ANSWER

SIP   DURATION  NOANSWER  ANSWER
670     18         1        2
671     9          1        0

select 
DISTINCT(SIP),
(select count(*) FROM table where TYPE="ANSWERED")
(select count(*) FROM table where TYPE="NO ANSWERED")
from table

但结果统计表上的所有记录，最好是分组使用

对不起，我是诺布：( 谢谢你的时间

---

马可

在这种情况下，将

分组依据

与有条件的

总和

和

计数

一起使用会更容易，如下例所示：

SELECT 
    SIP,
    SUM(CASE TYPE WHEN 'ANSWER' THEN DURATION ELSE 0 END) AS DURATION,
    COUNT(CASE WHEN TYPE = 'NO ANSWER' THEN 1 ELSE NULL END) AS NOANSWER,
    COUNT(CASE WHEN TYPE = 'ANSWER' THEN 1 ELSE NULL END) AS ANSWER
FROM table_name
GROUP BY SIP

演示：