delete from tablea & truncate table tablea的区别

delete from tablea & truncate table tablea的区别

DELETE FROM S WHERE 年龄>60语句的功能是______。A、从S表中彻底删除年龄大于60岁的记录 B

DELETE FROM S WHERE 年龄>60语句的功能是______。A、从S表中彻底删除年龄大于60岁的记录 B

From the study by the Pew Research Centers Internet & American Life Project, we know t

有SQL语句：SELECT * FROM 教师 WHERE NOT（工资>3000 OR 工资<2000)与如下语句等价的SQ

有SQL语句： SELECT DISTINCT 系号 FROM 教师 WHERE 工资>=； ALL（SELECT 工资 FROM 教师