How can i Convert this code from SQL server to MYSQL

MERGE INTO Table_ResidVaSell as ResidVaSell
       USING (
             Select Top 1 IDMavad,BeginDayTank From Table_Total where Tarikh>=@DateOf and IDMavad=1
             union
             Select Top 1 IDMavad,BeginDayTank From Table_TotalSell where Tarikh>=@DateOf and IDMavad=2
             union
             Select Top 1 IDMavad,BeginDayTank From Table_Sale where Tarikh>=@DateOf and IDMavad=3
              ) AS source
              ON ResidVaSell.IDMavad=source.IDMavad
    WHEN Not MATCHED THEN
    Insert (IDMavad,BeginDayTank) Values(source.IDMavad,Source.BeginDayTank);