sql searching problem

Question

I have a excel to maintain a customer list with 2 column, 1 is english and another is chinese name,which contains 3

I have another table in database customer table. also with c_english, c_chinese name and customer ID.

I have create a temp table and then import all the data in excel into temp table.

and then match to the physical table customer by using below script.

I want to use temp table as a based to check.how many customer can be matched and find out the customer ID.

select c.cistomerid, temp.english , temp.chimese, c.c_english, c.c_chinese from temp left join customer c on temp.chinese =c.c_chinese

however, the total no. of record is not same as the number of record in temp table, why. (more then 3 record)

I would like to check how many record can be matched by chinese name column, if it can't be match then the customer ID should be null or blank. otherwise , output the customer id

what should I do? any script to provide me for reference.

Answer 1

Hi @nononame2021
Try this code:

SELECT T.english,T.chinese,MAX(C.CustomerID)CustomerID  
FROM Temp T left join Customer C on T.chinese =C.c_chinese  
GROUP BY T.english,T.chinese  

Best regards,
LiHong

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Answer 2

Your script is correct, it just means that customer table has same c_chinese values in multiple rows and they all match. Do you want to grab just a single random customer id if there are multiple matches?