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)
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