SQL Help: How to collect summary number in group by?

Hello

I have the following table:

create table tb_class_info (classNbr number (5), number (2) of ClassType, classTeacherNbr number (4));

insert into tb_class_info values (101, 1, 12);

insert into tb_class_info values (001, 2, 12);

insert into tb_class_info_values (001, 2, 13);

insert into tb_class_info_values (002, 2, 12);

I would like to get statistics on the cnt, cnt for classType = 2 classTeacherNbr classNbr. I expect to have the following results:

classNbr classType2Cnt classTeacherCnt

101 0 0

001 2 2

002 2 1

The following SQL code I use:

SELECT classNbr,

SUM (CASE when classType = 2 THEN 1 ELSE END 0) as classTypeCnt,

SUM (CASE when classType = 2 SO unique classTeacherNbr ELSE 0 END) as classTeacherCnt

OF tb_class_info

GROUP BY classNbr;

However, I have the ' ORA-00905: lack of keyword ' error. Any suggestion on this subject?

Thanks for your help!

Select classnbr

sum (case when classtype = 2 then 1 end)

, count (distinct case when classtype = 2 then teachernbr end)

of tb_class_into

Classnbr group;

Tags: Database

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----------------------------------------

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------------------------------

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Instead of
```
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```
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```
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SQL Help: How to collect summary number in group by?

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