查询构建以查找所有一系列记录都具有值的记录

Question

Let me explain a little bit about what I am trying to do because I dont even know the vocab to use to ask. I have an Access 2016 database that records staff QA data. When a staff member misses a QA we assign a job aid that explains the process and they can optionally send back a worksheet showing they learned about what was missed. If they do all of these ina 3 month period they get a credit on their QA score. So I have a series of records all of whom have a date we assigned the work(RA1) and MAY have a work returned date(RC1).

In the below image "lavalleer" has earned the credit because both of her sheets got returned. "maduncn" Did not earn the credit because he didn't do one. I want to create a query that returns to me only the people that are like "lavalleer". I tried hitting google and searched here and access.programmers.co.uk but I'm only coming up with instructions to use Not null statements. That wouldn't work for me because if I did a IS Not Null on "maduncn" I would get the 4 records but it would exclude the null.

What I need to do is build a query where I can see staff that have dates in ALL of their RC1 fields. If any of their RC1 fields are blank I dont want them to return.

Answer 1

Consider:

SELECT * FROM tablename WHERE NOT UserLogin IN (SELECT UserLogin FROM tablename WHERE RCI IS NULL);

Answer 2

You could use a not exists clause with a correlated subquery, eg

select t.* from YourTable t where not exists 
(select 1 from YourTable u where t.userlogin = u.userlogin and u.rc1 is null)

Here, select 1 is used purely for optimisation - we don't care what the query returns, just that it has records (or doesn't have records).

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Or, you could use a left join to exclude those users for which there is a null rc1 record, eg:

select t.* from YourTable t left join
(select u.userlogin from YourTable u where u.rc1 is null) v on t.userlogin = v.userlogin
where v.userlogin is null

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In all of the above, change all occurrences of YourTable to the name of your table.