Creating a column (data type = check box) in Access using SQL

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Hey guys

Do you have any ideas for creating a column (data type = bool -> show as check box) in Access by using SQl? I'm wrinting a tool in MFC, C++ and I need to safe some values in a database.

I allready tried this, which I found somewhere in the internet:

ALTER TABLE table_name ADD COLUMN column_name BIT

That doesn't work...

..I hope someone can help me.

Greetings
Epanjohura

Posted 11-Feb-13 4:08am

epanjohura

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Maciej Los 11-Feb-13 10:20am

What you mean: "That doesn't work"?

epanjohura 11-Feb-13 10:32am

that means: I only get a created field (type = text) with the content 0 or 1, but I want to have "real" check boxes, where I can *check* values.
you know what I mean?

Maciej Los 12-Feb-13 8:30am

Now i understand.

epanjohura 12-Feb-13 8:26am

is there anybody who can help to solve this problem?

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Maciej Los · Answer 1 · 2013-02-12T03:17:00

Storing data is not the same as presenting data. So, your field is still "bit" type and can store values: true/false, enabled/disabled, Yes/No.

I know, there are some differences between programming windows forms and MFC programming[^], but it changes nothing in our discuss. Remember, only application's user interface (UI) is responsible for data presentation layer and control. Embeded mechanisms route user input commands (checked selections, button clicks) to internal functions that may update the application's data. UI controls (windows, edit boxes, checkboxes, etc.) are responsible for displaying the application's data after each update.

José Amílcar Casimiro · Answer 2 · 2013-02-11T04:11:00

Solution 1

ALTER TABLE mytable ADD mynewcolumn YESNO

Posted 11-Feb-13 4:11am

José Amílcar Casimiro

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epanjohura 11-Feb-13 10:15am

thank you for your answer, but that doesn't work. it creates the same as the code I tried.

José Amílcar Casimiro 11-Feb-13 10:22am

According to http://www.w3schools.com/sql/sql_datatypes.asp, YESNO is the default datatype for your question.
Maybe your problem have to do with your sql command, because True is equal to -1 and False is equal to 0.
Can you send more details about the problem or try to explain in a different way ?

epanjohura 11-Feb-13 10:30am

well, actually I want to have real check boxes in my access database, you know what I mean? with this YESNO commant I get only 0/1 as text in the created field

José Amílcar Casimiro 11-Feb-13 10:35am

When you open your mdb file using the access, you want to see a check box instead of a 0/1 values?

epanjohura 11-Feb-13 10:36am

yes, exactly :)

José Amílcar Casimiro 11-Feb-13 11:11am

Please check if this is applied to your question: http://office.microsoft.com/en-ca/access-help/create-a-check-box-toggle-button-or-option-button-HP005188421.aspx

epanjohura 11-Feb-13 11:14am

That's not what I'm looking for. This link shows an instruction how to do it manually after opening the database in Access in another view.
I want to do it automatically by just executing a command.

José Amílcar Casimiro 11-Feb-13 11:26am

I can't help you. Additionally i don't event think that is possible.

epanjohura 11-Feb-13 11:28am

well, thank you anyway