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I struggle with Qgis and some drawings of water pipes for a water company. According to the program it is possible to place different signatures for different components (stopcocks, T-pieces, etc.) From the various data located in the file "attribute table" I have to define that: the symbol is used if the value in column UNDERKLASS is equal to U22

thank you in advance Uffe

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There are multiple examples online, e.g.

enter image description here

Just google for QGIS rule-based renderer.

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Thank you, that helped me a lot :-) – Uffe Mar 14 '13 at 20:10
@Uffe Please upvote helpful answers and accept answers that solve your problem. – underdark Mar 15 '13 at 6:51

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