Insertar en valores de GBP Plus (cambio de índice) (y ((seleccione NumIndex de GBP Where ID> ID -1) - (Seleccione NumIndex de GBP Where ID = ID)))

INSERT INTO GBPPlus(IndexChange)
VALUES( ABS((SELECT NUMINDEX FROM GBP WHERE ID>ID-1) - (SELECT NUMINDEX FROM GBP WHERE ID=ID ))
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