saintom 发表于 2004-6-1 21:37:02

精妙SQL语句

说明：复制表(只复制结构,源表名：a 新表名：b)
SQL: select * into b from a where 1<>1说明：拷贝表(拷贝数据,源表名：a 目标表名：b)
SQL: insert into b(a, b, c) select d,e,f from b;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) &brvbar;&brvbar; /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.cinner 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
FROMHandle
WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle a)

蝈蝈 发表于 2004-12-26 22:58:24

看不懂！！！！！

saintom 发表于 2004-12-27 01:42:56

呵呵！！所以说你要学习呀！！
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