8

I'm trying to make a style based on rules, and I want to use a boolean field I have created for that.

But I do the following:

"field" like 'TRUE'
"field" like TRUE
"field" like 1
"field" like '1'

and nothing is selected.

How can I select true values in a boolean field then? I'm using QGIS reading from PostGIS database.

4
  • 1
    Would you be able to edit your question to include the GIS software that you are using, please ?
    – PolyGeo
    May 25 '15 at 20:11
  • 4
    I don't think the boolean field supports the like operator, try "field" = 1 instead. May 25 '15 at 21:18
  • What data source are you using? QGIS doesn't even support creating bool fields in new Shapefiles or Spatialite afaik.
    – underdark
    May 25 '15 at 21:54
  • Sorry: I'm using a postGIS database May 25 '15 at 22:06
4

When using a boolean, you need to use the IS operator instead of LIKE. So your expression should be:

"field" is true

However, since you want to select the fields which are TRUE, you can also shorthen this and use this expression:

"field"

This works because in QGIS the fields will be selected, where the used expression returns TRUE. So on a booleanfield it is enough when the content is TRUE and therefore returning TRUE when evaluating it.

Proof:

enter image description here

3

Finnally I have found the solution:

"field" like 't'

Thank you

3

I would recommend, in order to see how QGIS views the values, to use the "all unique" button.

You should get a list of values.

enter image description here

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