SQL Data Type for radio question Yes/No - Please specify text type

In SQL Which Data type I should choose to create those field in SQL

YES ?   No ?? (Same field contactMe) which Data Type ?
Please specify (ContactMeSpecify") which data type ?

And you do you recommand this data type please advice...

Would your give a course?

( ) Yes  () No
please specify: [                           ]

<input type="radio" name="contactMe" id="ContactMeYes" value="Yes">&nbsp;<label for="ContactMeYes">Yes</label>

<input type="radio" name="ContactMe" id="ContactMeNo" value="No">&nbsp;<label for="ContactMeNo">No <br>

(please specify)</label>
<input type="text" name="ContactMeSpecify" id="ContactMeSpecify" value="" maxlength="255" size="30" style="width: 200px;">
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Any field that only takes a yes or no response should be set as a BIT field. This takes up the smallest amount of data and is the recommended way to go.

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Paul MacDonaldDirector, Information SystemsCommented:
Boolean for all single bit binary (yes/no, 1/0, true/false) data.
LelloLelloAuthor Commented:
Okay thank you i have a choose a bit type

Should I choose allow nulls ? [  ]

I got that msg.

'volunteers' table
- Unable to modify table.  
ALTER TABLE only allows columns to be added that can contain nulls or have a DEFAULT definition specified. Column 'contactMe' cannot be added to table 'volunteers' because it does not allow nulls and does not specify a DEFAULT definition.

what that mean?
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I normally wouldn't allow null, and I would set a default value of 0 so that you aren't getting any false positives.
Paul MacDonaldDirector, Information SystemsCommented:
Unless you need the third state (null), I would establish a default value for the column.

Leaving the default as null would let you know the data had purposely been filled in, but then you have to check for a null value when you read from the column.
LelloLelloAuthor Commented:
so should i check the 'allow nulls' checkbox.
LelloLelloAuthor Commented:
so in the database i should insert Yes/No ?
LelloLelloAuthor Commented:
<cfquery name="logAnnualDues" datasource="#application.datasource#" username="#application.username#" password="#application.password#">
                  INSERT INTO volunteers (user_id, id_number, firstname, lastname, datereg)
                VALUES (
                <cfqueryparam value = "#form.user_id#" CFSQLType = "CF_SQL_INTEGER" />,
                <cfqueryparam value = "#form.id_number#" cfsqltype="CF_SQL_INTEGER" />,
                <cfqueryparam value = "#form.firstname#" CFSQLType = "CF_SQL_VARCHAR" /> ,
                <cfqueryparam value = "#form.lastname#" CFSQLType = "CF_SQL_VARCHAR" /> ,
                <cfqueryparam value = "#form.contactMe#" cfsqltype="cf_sql_bit" />
Paul MacDonaldDirector, Information SystemsCommented:
I wouldn't, unless you need to.  Set it so it has a default value (either true or false, depending on what you're storing).  

If you need to allow nulls, then by all means check the box.
LelloLelloAuthor Commented:
i want the user to choosee yes or no.
LelloLelloAuthor Commented:
well what i should do if i don't check the 'allow nulls' the SQL doesn't let me save it.  

In column Properties, which data i should change if i don't want to check the box of 'allow nulls.
It should let you if you set a default value.The error message stated you must either allow nulls OR enter a default value.

 If the user has to pick one or the other having a default value will not make any difference, but it will let you save it.
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Microsoft SQL Server

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