Question

I have one table,contains a field called Component.The datas are –

date             component
----------------------------
2012/12/11       PRP,PU1,P
2012/12/12       PRP 

I want to get result like this-

date          P_QTY
-----------------------
2012/12/11    1

I try a query-

select date,count(date) as P_Qty    
from MyTable 
where component like '%P%'
group by date 

but I get result-

date          P_QTY
-----------------------
2012/12/11    1
2012/12/12    1

There is ambiguous between PRP and P.
So, How can I remove ambiguous between P ,PRP and PU1?
Thanks in advance.

Answer 1

Firstly, it is not the recommended way to store a one-to-many relationship between date and P_QTY.

To get the desired result, your query should be

SELECT date,count(date) as P_Qty    
FROM MyTable
where 
    (
        component = 'P' OR 
        component LIKE 'P,%' OR 
        component LIKE '%,P,%' OR 
        component LIKE '%,P'
    )
GROUP BY date