oracle

select * from emp//上面表中查询的结果是2

2012-09-06

select * from emp//下面表中查询的结果是2?idnamegrade1Mirro602David75[解决办法]select count(*) from

select * from emp//下面表中查询的结果是2?
id name grade
1 Mirro 60
2 David 75

[解决办法]
select count(*) from emp?

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