employee的表结构及数据结构如图所示，以下语句结果分别为： ID Name Score 1 jack 1 2 tom 1 3 rose null select count(*) from employee; select conut(1) from employee; select count(Score) from employee; 3,1,3 3,3,2 3,1,2 3,3,1
ID
Name
Score
1
jack
2
tom
3
rose
null
select count(*) from employee; select conut(1) from employee; select count(Score) from employee;
3,1,3
3,3,2
3,1,2
3,3,1
