UPDATE table11, table12, table13 SET table11.aval1 = table12.bval1 WHERE table11.id = table13.id AND table12.bval2 = table13.cval1
UPDATE table11, table12, table13 SET table11.aval1 = table12.bval1 WHERE table11.id = table13.id AND table12.bval2 = table13.cval1
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