MS Access to SQL

When designs a database using a checkbox (Yes/No) and upsizes the database to SQL, What field type does SQL use as there is no Yes/No in SQL?
Gregory AmbroseAsked:
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Mike EghtebasDatabase and Application DeveloperCommented:
bit

0 no
1 yes
Guru JiCommented:
You can use the Bit Data field which basically has 1 and 0 for Y or N. But if you want to be more flexible then use  char(1) then you can even put T/F in a column that also has Y/N, and even 1/0.
kulboyCommented:
The equivalent is a bit field.

In SQL you use 0 and 1 to set a bit field (just as a yes/no field in Access). In Management Studio it displays as a false/true value (at least in recent versions).
PatHartmanCommented:
You need to be careful about nulls.  Either SQL Server allows nulls or Jet/ACE does but the other doesn't.  I'm having a senior moment and can't remember which way it goes.   So, when I create Yes/No columns in Access, I always define them as required and populate them with a default true or false depending on what makes sense for the "question".  That makes upsizing easier.

Also, I recently had a gotcha in an app that was converted from ACE to SQL Server which apparently I had never run into before.  SQL Server does not apply defaults until a record is saved (which I knew but lost sight of) but Access applies them as soon as you type the first character and dirty a record.  In one particular form,  the code was looking at a Yes/No field and assuming it had a value (which it did when run with the Access BE but not with SQL server).  The simplest solution was to add defaults to the control on the form so that the form would populate the default.

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Mike EghtebasDatabase and Application DeveloperCommented:
a bit has three options:
null tbd meaning no entry is made
0     false
1    true

IIF(Nz(FieldYN, "")<>"","Is either YES or NO'', "Is tbd")

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