Clear many fields in a query

I have a table from which I want to clear all data in many fields, but not all fields.
The field types differ. Some are dates and some are strings. I will like to use an update query.
The table has 8400 records.
Or would you rather suggest I use code.
How should I do it? How do you update a date to "nothing"? And a string?
My select query looks as below.

SELECT TblBlocks.SampleDate, TblBlocks.TestDate, TblBlocks.Virus, TblBlocks.TestResult, TblBlocks.TestComment, TblBlocks.AM, TblBlocks.AMDate, TblBlocks.CommentAM, TblBlocks.AGC, TblBlocks.AGCDate, TblBlocks.CommentAGC, TblBlocks.AP, TblBlocks.APDate, TblBlocks.CommentAP, TblBlocks.AR, TblBlocks.ARDate, TblBlocks.CommentAR, TblBlocks.BC, TblBlocks.BCDate, TblBlocks.CF, TblBlocks.CFDate, TblBlocks.CommentCF, TblBlocks.CL, TblBlocks.CLDate, TblBlocks.CommentCL, TblBlocks.CR, TblBlocks.CRDate, TblBlocks.CommentCR, TblBlocks.FL, TblBlocks.FLDate, TblBlocks.CommentFL, TblBlocks.GCB, TblBlocks.GCBDate, TblBlocks.CommentGCB, TblBlocks.GD, TblBlocks.GDDAte, TblBlocks.CommentGD, TblBlocks.GF, TblBlocks.GFDate, TblBlocks.CommentGF, TblBlocks.GFL, TblBlocks.GFLDate, TblBlocks.CommentGFL, TblBlocks.GS, TblBlocks.GSDate, TblBlocks.CommentGS, TblBlocks.LP, TblBlocks.LPDate, TblBlocks.CommentLP, TblBlocks.LR, TblBlocks.LRDate, TblBlocks.CommentLR, TblBlocks.LRC, TblBlocks.LRCDate, TblBlocks.CommentLRC, TblBlocks.NS, TblBlocks.NSDate, TblBlocks.CommentNS, TblBlocks.PD, TblBlocks.PDDate, TblBlocks.CommentPD, TblBlocks.PL, TblBlocks.PLDate, TblBlocks.CommentPL, TblBlocks.PKRR, TblBlocks.PKRRDate, TblBlocks.CommentPKRR, TblBlocks.PKRV, TblBlocks.PKRVDate, TblBlocks.CommentPKRV, TblBlocks.PR, TblBlocks.PRDate, TblBlocks.CommentPR, TblBlocks.PRPM, TblBlocks.PRPMDate, TblBlocks.CommentPRPM, TblBlocks.PDW, TblBlocks.PDWDate, TblBlocks.CommentPDW, TblBlocks.QS, TblBlocks.QSDate, TblBlocks.CommentQS, TblBlocks.RL, TblBlocks.RLDate, TblBlocks.CommentRL, TblBlocks.RR, TblBlocks.RRDate, TblBlocks.CommentRR, TblBlocks.RW, TblBlocks.RWDate, TblBlocks.CommentRW, TblBlocks.SB, TblBlocks.SBDate, TblBlocks.CommentSB, TblBlocks.SD, TblBlocks.SDDate, TblBlocks.CommentSD, TblBlocks.SG, TblBlocks.SGDate, TblBlocks.CommentSG, TblBlocks.SP, TblBlocks.SPDate, TblBlocks.CommentSP, TblBlocks.SR, TblBlocks.SRDate, TblBlocks.CommentSR, TblBlocks.SS, TblBlocks.SSDate, TblBlocks.CommentSS, TblBlocks.TL, TblBlocks.TLDate, TblBlocks.CommentTL, TblBlocks.TP, TblBlocks.TPDate, TblBlocks.CommentTP, TblBlocks.VS, TblBlocks.VSDate, TblBlocks.CommentVS, TblBlocks.VY, TblBlocks.VYDate, TblBlocks.CommentVY, TblBlocks.YB, TblBlocks.YBDate, TblBlocks.CommentYB, TblBlocks.GVA, TblBlocks.GVADate, TblBlocks.CommentGVA, TblBlocks.GVB, TblBlocks.GVBDate, TblBlocks.CommentGVB, TblBlocks.NoVirus, TblBlocks.NoVirusDate, TblBlocks.CommentNoVirus
FROM TblBlocks;
Fritz PaulAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Rey Obrero (Capricorn1)Commented:
you can clear a date field by setting the field value to NULL
Text fields can be cleared with a zero-length string "", or with NULL

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Éric MoreauSenior .Net ConsultantCommented:
Your Update query will look like this:

UPDATE TblBlocks
SET Virus = NULL
, TestResult = NULL
, TestComment = NULL
WHERE YourConditionOnTheRowsToBeUpdated

Open in new window

Rey Obrero (Capricorn1)Commented:
just use an update query, no need for codes.
Fritz PaulAuthor Commented:
Thanks it worked well.
I had to create two update queries on account of "too many fields".
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Access

From novice to tech pro — start learning today.