Re: [Qgis-user] Logical or boolean column

Wed, 03 Jun 2015 16:06:42 -0700 

Hi Nicolas 
Thanks for your response. For further background, my QGIS table is already 
successfully linked to the SQL table that already has data, and the new column 
that I want to make logical does not yet exist in the sql table. I know that I 
can create a new column in QGIS and this 'pushes' the new column through to the 
SQL however I am not sure what datatype to pick to make the boolean possible. 
 What would you suggest? 
If I was creating the table directly in SQL, I would pick the bit data type, 
meaning it could only take 0 or 1 values, however looking at the Add Column 
Type drop down list, I can't see any bit provider types.  Perhaps I should 
pick the option 1 Bytes integer as this should be compatible with the sql 
table.  I just want to follow best practice and try to cater for future 
requirements on this data. 

Kind Regards 


Chrissie Hind 



"Nicolas Cadieux [via OSGeo.org]" ---03/06/2015 10:35:05 PM---Hi, 
 If I understand, your boolean values are in the MS SQL table?  
Then you will need a field 

From:   "Nicolas Cadieux [via OSGeo.org]" 
<ml-node+s1560n5208891...@n6.nabble.com> 
To:     Chrissie Hind <ch...@bayside.vic.gov.au>, 
Date:   03/06/2015 10:35 PM 
Subject:        Re: Logical or boolean column 



Hi,
If I understand, your boolean values are in the MS SQL table?  Then you 
will need a field with unique values (integers are simpler) in both the QGIS 
table and the external table in order to link both tables.  If you can't 
use integers, you could use another type but this field needs to be unique 
(therefore if you use a family name, you are likely to have two identical 
names.) 
Nicolas Cadieux M.Sc. 
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2 
Téléphone: 514.381.5112  Fax: 514.381.4995 
www.archeotec.ca
On Jun 2, 2015 9:56 PM, "CHind [via OSGeo.org]" < [hidden email] 
> wrote:

Hi 

I would like to add a new column to a linked MS SQL table within QGIS via the 
Layer Properties, Fields, Add column. 

I am not sure what option to use within the Type to select as I only want to 
retain boolean values or either 0 or 1,  Y or N, or T or F. 

What is the best practice here? 

Kind Regards 


Chrissie Hind 
Senior GIS Analyst 
Bayside City Council
T:  03 9599 4792 
F:  03 9598 4474 
M:  0409 938 697 

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