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insert into t1 (big) values (-1),(9223372036854775808),(9223372036854775807),(9223372036854775808);
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select min(big),max(big),max(big)-1 from t1;
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select min(big),max(big),max(big)-1 from t1 group by a;
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alter table t1 modify big bigint not null;
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select min(big),max(big),max(big)-1 from t1;
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select min(big),max(big),max(big)-1 from t1 group by a;
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49
insert into t1 (big) values (9223372036854775808);
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51
select min(big),max(big),max(big)-1 from t1;