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I'm trying to create a label that will show the following: MP 23.6 The "23.6" is a double type column in my table, the "MP" is the text I want to add in front of it of the number (milepost).

I am new to QGIS.

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You are trying to perform an addition between a string and a number. Instead, use the || evaluator which will concatenate both into a string like so:

'MP' || "Milepost"

You could also transform the value of your Milepost field to a string in your expression as in this question/answer.

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  • The OP needs a space between MP and the mileage value.
    – Stu Smith
    Commented Jun 21, 2019 at 0:59

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