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deleted 11 characters in body
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Taras
  • 34k
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This expression worked for me, thanks for help:

if("diameter_valve" is nullNULL,
    overlay_nearest('waterpipe', diameter_pipe, max_distance:=0.01)[0],
    "diameter_valve"
    )

This expression worked for me, thanks for help

if("diameter_valve" is null,
overlay_nearest('waterpipe',diameter_pipe,max_distance:=0.01)[0],"diameter_valve")

This expression worked for me:

if("diameter_valve" is NULL,
    overlay_nearest('waterpipe', diameter_pipe, max_distance:=0.01)[0],
    "diameter_valve"
    )
added 8 characters in body
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MrXsquared
  • 35.6k
  • 22
  • 71
  • 121

This expression worked for me, thanks for help

if("diameter_valve" is null, overlay_nearest('waterpipe',diameter_pipe,max_distance:=0.01)[0],"diameter_valve")

if("diameter_valve" is null,
overlay_nearest('waterpipe',diameter_pipe,max_distance:=0.01)[0],"diameter_valve")

This expression worked for me, thanks for help

if("diameter_valve" is null, overlay_nearest('waterpipe',diameter_pipe,max_distance:=0.01)[0],"diameter_valve")

This expression worked for me, thanks for help

if("diameter_valve" is null,
overlay_nearest('waterpipe',diameter_pipe,max_distance:=0.01)[0],"diameter_valve")
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This expression worked for me, thanks for help

if("diameter_valve" is null, overlay_nearest('waterpipe',diameter_pipe,max_distance:=0.01)[0],"diameter_valve")