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drop procedure if exists sp1;
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DECLARE v1, v2, v3, v4 DECIMAL(28,12);
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DECLARE v3_2, v4_2 DECIMAL(28, 12);
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SET v3 = 1000000000000;
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SET v4 = 2000000000000;
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WHILE counter < 100000 DO
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SET v1 = v1 + 0.000000000001;
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SET v2 = v2 - 0.000000000001;
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SET counter = counter + 1;
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SET v3_2 = v3 * 0.000000000001;
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SET v4_2 = v4 * 0.000000000001;
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SELECT v1, v2, v3, v3_2, v4, v4_2;
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1.000000100000 1.999999900000 1000000100000.000000000000 1.000000100000 1999999900000.000000000000 1.999999900000