更多“select count（*） from student和select count（id） from student之间的区别是什么？”相关的问题
A、A.select job from emp; B、B.select job,count(*) from emp; C、C.select distinct job,count(*) from emp; D、D.select job,count(*) from emp group by job; E、E.select job,sum(empno) from emp group by job;
A、SELECT TOTAL(*) FROM customers; B、SELECT COUNT(*) FROM customers; C、SELECT TOTAL(customer_id) FROM customers; D、SELECT COUNT(customer_id) FROM customers; E、SELECT COUNT(customers) FROM customers; F、SELECT TOTAL(customer_name) FROM customers;
A、Select Count（1）From Student B、Select Sum（*）From Student C、Selec tAvg（*）From Student D、Select Count（*）From Student
A、SELECT COUNT(*) FROM employees WHERE last_name='Smith'; B、SELECT COUNT(dept_id) FROM employees WHERE last_name='Smith'; C、SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith'; D、SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith'; E、SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith';
A、SELECT Sno， COUNT（*） FROM SC GROUP BY Sno B、SELECT Sno FROM SC GROUP BY Sno WHERE COUNT（*）> 3 C、SELECT Sno FROM SC GROUP BY Sno HAVING COUNT（*）> 3 D、SELECT Sno FROM SC GROUP BY Sno
A、CREATE VIEW v1AS SELECT类别，SUM（数量）FROM商品GROUP BY类别 B、CREATE VIEW v1AS SELECT类别，COUNT（数量）FROM商品GROUP BY类别 C、CREATE VIEW v1（类别，总数量）AS SELECT类别，SUM（数量）FROM商品GROUP BY类别 D、CREATE VIEW v1（类别，总数量）AS SELECT类别，COUNT（数量）FROM商品GROU PBY类别
A、A.SELECT MIN （年龄） AS 平均 FROM 学生表 B、B.SELECT MAX （年龄） AS 平均 FROM 学生表 C、C.SELECT AVG （年龄） AS 平均 FROM 学生表 D、D.SELECT COUNT （年龄） AS 平均 FROM 学生表
A、SELECT TOTAL(*) FROM customer; B、SELECT COUNT(*) FROM customer; C、SELECT TOTAL(customer_id) FROM customer; D、SELECT COUNT(customer_id) FROM customer; E、SELECT COUNT(customers) FROM customer; F、SELECT TOTAL(customer_name) FROM customer;
A、SELECT TOTAL(*) FROM customer; B、SELECT COUNT(*) FROM customer; C、SELECT TOTAL(customer_id) FROM customer; D、SELECT COUNT(customer_id) FROM customer; E、SELECT COUNT(customers) FROM customer; F、SELECT TOTAL(customer_name) FROM customer;
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