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trim(GREATEST(lpad(' ' || a,20,' '),lpad(' ' || b,20,' '),lpad(' ' || c,20 ,' ')))
trim(GREATEST(lpad(a,20,' '),lpad(b,20,' '),lpad(c,20 ,' ')))
SELECT deminid,ammountid,ammountvalue,
greatest(deminid,ammountid,ammountvalue)
FROM test1