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SET TotalAmountBase = ISNULL(A.SumBase,0) + ISNULL(B.SumBase, 0)
FROM Table_D D
LEFT JOIN (SELECT LogId, Sum(amountBase) as SumBase FROM Table_A Group By LogId) A ON A.LogId = D.LogId
LEFT JOIN (SELECT LogId, Sum(amountBase) as SumBase FROM Table_B Group By LogId) B ON B.LogId = D.LogId
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