Sql常见面试题.doc

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说明：显示文章、提交人和最后回复时间 SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b 说明：外连接查询(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 说明：日程安排提前五分钟提醒 SQL: select * from 日程安排 where datediff(minute,f开始时间,getdate()5 说明：两张关联表，删除主表中已经在副表中没有的信息 SQL: delete from info where not exists ( select * from infobz where info.infid=infobz.infid ) 说明：- SQL: SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE FROM TABLE1, (SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND FROM TABLE2 WHERE TO_CHAR(UPD_DATE,YYYY/MM) = TO_CHAR(SYSDATE, YYYY/MM) X, (SELECT NUM, UPD_DATE, STOCK_ONHAND FROM TABLE2 WHERE TO_CHAR(UPD_DATE,YYYY/MM) = TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, YYYY/MM) /01,YYYY/MM/DD) - 1, YYYY/MM) ) Y, WHERE X.NUM = Y.NUM （+） AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) X.STOCK_ONHAND ) B WHERE A.NUM = B.NUM 说明：- SQL: select * from studentinfo where not exists(select * from student where studentinfo.id=student.id) and 系名称=&strdepartmentname& and 专业名称=&strprofessionname& order by 性别,生源地,高考总成绩 说明： 从数据库中去一年的各单位电话费统计(电话费定额贺电化肥清单两个表来源） SQL: SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, yyyy) AS telyear, SUM(decode(TO_CHAR(a.telfeedate, mm), 01, a.factration) AS JAN, SUM(decode(TO_CHAR(a.telfeedate, mm), 02, a.factration) AS FRI, SUM(decode(TO_CHAR(a.telfeedate, mm), 03, a.factration) AS MAR, SUM(decode(TO_CHAR(a.telfeedate, mm), 04, a.factration) AS APR, SUM(decode(TO_CHAR(a.telfeedate, mm), 05, a.factration) AS MAY, SUM(decode(TO_CHAR(a.telfeedate, mm), 06, a.factration) AS JUE, SUM(decode(TO_CHAR(a.telfeedate, mm), 07, a.factration) AS JUL, SUM(decode(TO_CHAR(a.telfeedate, mm), 08, a.factration) AS AGU, SUM(decode(TO_CHAR(a.telfeedate, mm), 09, a.factration) AS SEP, SUM(decode(TO_CHAR(a.telfeedate, mm), 10, a.factration) AS OCT, SUM(decode(TO_CHAR(a.telfeedate, mm), 11, a.factration) AS NOV, SUM(decode(TO_CHAR(a.telfeedate, mm), 12, a.factration) AS DEC FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration FROM TELFEESTAND a, TELFEE b WHERE a.tel = b.telfax) a GROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, yyyy) 说明：四表联查问题： SQL: select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where . 说明：得到表中最小的未使用的ID号 SQL: SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END) as HandleID FROM Handle WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle a)*有两个表A和B，均有key和value两个字段，如果B的key在A中也有，就把B的value换为A中对应的value这道题的SQL语句怎么写？update b set b.value=(select a.value from a where a.key=b.key) where b.id in(select b.id from b,a where b.key=a.key);*高级sql面试题原表: courseid coursename score - 1 java 70 2 oracle 90 3 xml 40 4 jsp 30 5 servlet 80 - 为了便于阅读,查询此表后的结果显式如下(及格分数为60): courseid coursename score mark - 1 java 70 pass 2 oracle 90 pass 3 xml 40 fail 4 jsp 30 fail 5 servlet 80 pass - 写出此查询语句没有装，没试过 select courseid, coursename ,score ,decode（sign(score-60),-1,fail,pass) as mark from course完全正确 SQL desc course_v Name Null? Type - - - COURSEID NUMBER COURSENAME VARCHAR2(10) SCORE NUMBER SQL select * from course_v; COURSEID COURSENAME SCORE - - - 1 java 70 2 oracle 90 3 xml 40 4 jsp 30 5 servlet 80 SQL select courseid, coursename ,score ,decode(sign(score-60),-1,fail,pass) as mark from course_v; COURSEID COURSENAME SCORE MARK - - - - 1 java 70 pass 2 oracle 90 pass 3 xml 40 fail 4 jsp 30 fail 5 servlet 80 pass*原表: id proid proname 1 1 M 1 2 F 2 1 N 2 2 G 3 1 B 3 2 A 查询后的表: id pro1 pro2 1 M F 2 N G 3 B A 写出查询语句解决方案 sql求解 表a 列 a1 a2 记录 1 a 1 b 2 x 2 y 2 z 用select能选成以下结果吗？ 1 ab 2 xyz 使用pl/sql代码实现，但要求你组合后的长度不能超出oracle varchar2长度的限制。 下面是一个例子 create or replace type strings_table is table of varchar2(20); / create or replace function merge (pv in strings_table) return varchar2 is ls varchar2(4000); begin for i in 1.pv.count loop ls := ls | pv(i); end loop; return ls; end; / create table t (id number,name varchar2(10); insert into t values(1,Joan); insert into t values(1,Jack); insert into t values(1,Tom); insert into t values(2,Rose); insert into t values(2,Jenny); column names format a80; select t0.id,merge(cast(multiset(select name from t where t.id = t0.id) as strings_table) names from (select distinct id from t) t0; drop type strings_table; drop function merge; drop table t; 用sql： Well if you have a thoretical maximum, which I would assume you would given the legibility of listing hundreds of employees in the way you describe then yes. But the SQL needs to use the LAG function for each employee, hence a hundred emps a hundred LAGs, so kind of bulky. This example uses a max of 6, and would need more cut n pasting to do more than that. SQL select deptno, dname, emps 2 from ( 3 select d.deptno, d.dname, rtrim(e.ename |, | 4 lead(e.ename,1) over (partition by d.deptno 5 order by e.ename) |, | 6 lead(e.ename,2) over (partition by d.deptno 7 order by e.ename) |, | 8 lead(e.ename,3) over (partition by d.deptno 9 order by e.ename) |, | 10 lead(e.ename,4) over (partition by d.deptno 11 order by e.ename) |, | 12 lead(e.ename,5) over (partition by d.deptno 13 order by e.ename), ) emps, 14 row_number () over (partition by d.deptno 15 order by e.ename) x 16 from emp e, dept d 17 where d.deptno = e.deptno 18 ) 19 where x = 1 20 / DEPTNO DNAME EMPS - - - 10 ACCOUNTING CLARK, KING, MILLER 20 RESEARCH ADAMS, FORD, JONES, ROONEY, SCOTT, SMITH 30 SALES ALLEN, BLAKE, JAMES, MARTIN, TURNER, WARD also 先create function get_a2; create or replace function get_a2( tmp_a1 number) return varchar2 is Col_a2 varchar2(4000); begin Col_a2:=; for cur in (select a2 from unite_a where a1=tmp_a1) loop Col_a2=Col_a2|cur.a2; end loop; return Col_a2; end get_a2; select distinct a1 ,get_a2(a1) from unite_a 1 ABC 2 EFG 3 KMN*一个SQL 面试题 去年应聘一个职位未果,其间被考了一个看似简单的题,但我没有找到好的大案.不知各位大虾有无好的解法?题为:有两个表, t1, t2,Table t1:SELLER | NON_SELLER- -A BA CA DB AB CB DC AC BC DD AD BD CTable t2:SELLER | COUPON | BAL- - -A 9 100B 9 200C 9 300D 9 400A 9.5 100B 9.5 20A 10 80要求用SELECT 语句列出如下结果:-如A的SUM(BAL)为B,C,D的和,B的SUM(BAL)为A,C,D的和.且用的方法不要增加数据库负担,如用临时表等.NON-SELLER| COUPON | SUM(BAL) - -A 9 900B 9 800C 9 700D 9 600 A 9.5 20B 9.5 100C 9.5 120D 9.5 120A 10 0B 10 80C 10 80D 10 80关于论坛上那个SQL微软面试题问题：一百个账户各有100$，某个账户某天如有支出则添加一条新记录，记录其余额。一百天后，请输出每天所有账户的余额信息这个问题的难点在于每个用户在某天可能有多条纪录，也可能一条纪录也没有（不包括第一天）返回的记录集是一个100天*100个用户的纪录集下面是我的思路：1.创建表并插入测试数据：我们要求username从1-100CREATE TABLE dbo.TABLE2 (username varchar (50) NOT NULL , -用户名outdate datetime NOT NULL , -日期cash float NOT NULL -余额) ON PRIMARYdeclare i intset i=1while i=100 begin insert table2 values(convert(varchar(50),i),2001-10-1,100) insert table2 values(convert(varchar(50),i),2001-11-1,50) set i=i+1 endinsert table2 values(convert(varchar(50),i),2001-10-1,90)select * from table2 order by outdate,convert(int,username)2.组合查询语句：a.我们必须返回一个从第一天开始到100天的纪录集：如：2001-10-1（这个日期是任意的） 到 2002-1-8由于第一天是任意一天，所以我们需要下面的SQL语句：select top 100 dateadd(d,convert(int,username)-1,min(outdate) as outdatefrom table2group by usernameorder by convert(int,username)这里的奥妙在于：convert(int,username)-1（记得我们指定用户名从1-100 :-)group by username,min(outdate):第一天就可能每个用户有多个纪录。返回的结果：outdate - 2001-10-01 00:00:00.000.2002-01-08 00:00:00.000b.返回一个所有用户名的纪录集：select distinct username from table2 返回结果：username - 110100.99c.返回一个100天记录集和100个用户记录集的笛卡尔集合：select * from(select top 100 dateadd(d,convert(int,username)-1,min(outdate) as outdatefrom table2group by usernameorder by convert(int,username) as ACROSS join (select distinct username from table2 ) as Border by outdate,convert(int,username)返回结果100*100条纪录：outdate username2001-10-01 00:00:00.000 1.2002-01-08 00:00:00.000 100d.返回当前所有用户在数据库的有的纪录：select outdate,username,min(cash) as cash from table2group by outdate,usernameorder by outdate,convert(int,username)返回纪录：outdate username cash2001-10-01 00:00:00.000 1 90.2002-01-08 00:00:00.000 100 50e.将c中返回的笛卡尔集和d中返回的纪录做left join:select C.outdate,C.username,D.cashfrom(select * from(select top 100 dateadd(d,convert(int,username)-1,min(outdate) as outdatefrom table2group by usernameorder by convert(int,username) as ACROSS join (select distinct username from table2 ) as B) as Cleft join(select outdate,username,min(cash) as cash from table2group by outdate,username) as Don(C.username=D.username and datediff(d,C.outdate,D.outdate)=0)order by C.outdate,convert(int,C.username)注意：用户在当天如果没有纪录，cash字段返回NULL，否则cash返回每个用户当天的余额outdate username cash2001-10-01 00:00:00.000 1 902001-10-01 00:00:00.000 2 100.2001-10-02 00:00:00.000 1 902001-10-02 00:00:00.000 2 NULL -注意这里.2002-01-08 00:00:00.000 100 50f.好了，现在我们最后要做的就是，如果cash为NULL，我们要返回小于当前纪录日期的第一个用户余额(由于我们使用order by cash,所以返回top 1纪录即可，使用min应该也可以)，这个余额即为当前的余额：case isnull(D.cash,0)when 0 then (select top 1 cash from table2 where table2.username=C.usernameand datediff(d,C.outdate,table2.outdate)0 order by table2.cash)else D.cashend as cashg.最后组合的完整语句就是select C.outdate,C.username,case isnull(D.cash,0)when 0 then (select top 1 cash from table2 where table2.username=C.usernameand datediff(d,C.outdate,table2.outdate)0 order by table2.cash)else D.cashend as cashfrom(select * from(select top 100 dateadd(d,convert(int,username)-1,min(outdate) as outdatefrom table2group by usernameorder by convert(int,username) as