How can i use a min() funct in this sql query?

开发者_JS百科UPDATE
            MRT

SET 
             Date = MR.Date

FROM
             MRT
             JOIN MR on MR.SKU = MRT.SKU

HERE Is where i would like to do an order by min(mr.Date)

All I get is an incorrect Syntax error.

I have to set the date = the smallest mr.date

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UPDATE MRT SET Date = (SELECT min(Date) FROM MR WHERE MR.SKU = MRT.SKU);