"GNR" is a string column and I expect the filter expression
"GNR"='.11' to only return the feature with the value
Why are the other features with values of
Is there something wrong with my query?
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There is nothing wrong with your query.
= is a comparison operator and it returns all the records which begins with your string
Use this instead:
"GNR" LIKE '.11'
When you compare alphabetic characters, use
QGIS 2.0.1 or newer you can use regular expressions, also:
^indicates the start of the string;
$indicates the end of the string.