SQL语句介绍

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’) || ‘/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


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