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For future reference: the next version of qgisQGIS (3.6) includes a built in "remove duplicates by field value"-in 'Delete duplicates by attribute' tool which does exactly this.
For future reference: the next version of qgis (3.6) includes a built in "remove duplicates by field value" tool which does exactly this.
For future reference: the next version of QGIS (3.6) includes a built-in 'Delete duplicates by attribute' tool which does exactly this.