說明：復制表(只復制結(jié)構(gòu),源表名：a 新表名：b)
SQL: select * into b from a where 1<>1

說明：拷貝表(拷貝數(shù)據(jù),源表名：a 目標表名：b)
SQL: insert into b(a, b, c) select d,e,f from b;

說明：顯示文章、提交人和最后回復時間
SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b

說明：外連接查詢(表名1：a 表名2：b)
SQL: select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c

說明：日程安排提前五分鐘提醒
SQL:  select * from 日程安排 where datediff('minute',f開始時間,getdate())>5

說明：兩張關(guān)聯(lián)表，刪除主表中已經(jīng)在副表中沒有的信息
SQL: 
delete from info where not exists ( select * from infobz where info.infid=infobz.infid