SELECT INNER JOIN仅返回一个结果

Question

I'm having trouble selecting some data from 2 tables in my database.

The tables are psthostess and psttodo-uit .

In my psthostess I want to select the fields Code and Name .
In my psttodo-uit I want to select:

• sum of PB=1
• sum of PG=1
• sum of PA=1
• sum of h.GoedkeuringDoorNew=GF
• sum of h.GoedkeuringDoorNew=SB
• sum of h.GoedkeuringDoorNew=VIA
• sum of h.Blanco

This is my query:

SELECT p.Code, p.Name, sum(h.PB = 1), sum(h.PG = 1), sum(h.PA = 1), 
       sum(h.GoedkeuringDoorNew = 'GF'), sum(h.GoedkeuringDoorNew = 'SB'),  
       sum(h.GoedkeuringDoorNew = 'VIA'), sum(h.Blanco)
   FROM psthostess p
   INNER JOIN `psttodo-uit` h ON h.`Hostess Code` = p.Code
   WHERE p.Indienst = 1

The problem is that I always get a result of one row. But there are multiple rows in psthostess with Indienst = 1 (WHERE). How can I fix this?

Answer 1

You need to group it by non-aggregated columns.

SELECT p.Code, p.Name, sum(h.PB = 1), 
sum(h.PG = 1), sum(h.PA = 1), sum(h.GoedkeuringDoorNew = 'GF'), 
sum(h.GoedkeuringDoorNew = 'SB'), sum(h.GoedkeuringDoorNew = 'VIA'), sum(h.Blanco)
FROM psthostess p
INNER JOIN `psttodo-uit` h ON h.`Hostess Code` = p.Code
WHERE p.Indienst = 1
group by p.Code, p.Name