假设 departments 表中有如下四个字段: dep artme nt_id, dep artme nt_n ame, dep artme nt_age, dep artme nt」ob 那么我们可以认为 SELECT * FROM departments;这个语句也就等同于 SELECT dep artme nt_id, dep artme......
[法一:同前例] [法二:用 Select Case 语句] 四、Select Case 语句(多分支) 1.格式 [格式一] Select case 表达式 Case 表达式 1:语句块 1 Case 表达式 2:语句块 2 Case 表达式 3:语句块 3 ?? Case Else:语句块 n End......
select c.customer_num,c.lname,c.company,c.phone,u.call_dtime,u.call_descr from customer c left outer join cust_calls u on c.customer_num = u.customer_num; select c.customer_num,c.lname,c.company,c.phone,u......
select * form aa where 后面是什么样的条件?一.SELECT 语句的完整语法为: SELECT[ALL|DISTINCT|DISTINCTROW|TOP] {*|talbe.*|[table.]field1[AS alias1][,[table.]field2[AS alia select......