If false, search both true and false in Access sql

SELECT id
FROM Activity
WHERE important = see below

IF [Forms]![Search]![important] = false, search for both true and false

IF [Forms]![Search]![important] = true, search for only tru开发者_如何学运维e

I hope you understand what I want to do. Is this possible?

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Try this:

SELECT id
FROM Activity
WHERE important = @important OR @important = false

Or, maybe (just like ammoQ said)

SELECT id
FROM Activity
WHERE important OR NOT [Forms]![Search]![important]

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Probably the shortest form, though not very readable:

SELECT id
FROM Activity
WHERE important OR NOT @important