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oracle number类型null值的大小验证:
with temp as ( select null a From dual union select 1 a From dual union select 3 a From dual union select 5 a From dual union select 10 a From dual ) select * from temp where 1=1 — and a = null –无结果 — and a is not null –查询到null记录
and a<11 –查不到null记录
总结:null比任何数值大
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