oracle怎么并列查询 oracle 查询列
oracle 多列合并查询
select a.id,a.name,nvl(sum(b.quantity),0) quantity from a,b where a.id=b.id(+) group by a.id,a.name
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我回答的比楼上早,忘记加group by了,呵呵
oracle中查询表2到5行并列查出6到8行的信息
oracle中使用排名函数来完成类似的需求。
--使用ROW_NUMBER()
select * from
(
select stuID,stuName,age ,ROW_NUMBER() OVER (ORDER BY stuID desc) RN
from Student
) NewData
where RN BETWEEN 2 AND 5 or RN BETWEEN 6 AND 8
oracle怎么把2张表字段并排查询出来?
你这个问题解决了.
结果如图的形式.
SELECT MAX(DECODE(B.NO, 1, A.NUM1, NULL)) NUM1,
MAX(DECODE(B.NO, 1, A.NUM2, NULL)) NUM2,
MAX(DECODE(B.NO, 2, A.NUM1, NULL)) NUM1,
MAX(DECODE(B.NO, 2, A.NUM2, NULL)) NUM2,
MAX(DECODE(B.NO, 3, A.NUM1, NULL)) NUM1,
MAX(DECODE(B.NO, 3, A.NUM2, NULL)) NUM2,
MAX(DECODE(B.NO, 4, A.NUM1, NULL)) NUM1,
MAX(DECODE(B.NO, 4, A.NUM2, NULL)) NUM2,
MAX(DECODE(B.NO, 5, A.NUM1, NULL)) NUM1,
MAX(DECODE(B.NO, 5, A.NUM2, NULL)) NUM2
FROM TABLE1 A, TABLE2 B
WHERE A.NUM = B.NUM;
在oracle中查询公司中工资最高的两个人的员工号、lastname和工资,要求并列的
select 员工号、lastname、工资 from (
select 员工号、lastname、工资 from 表 order by 工资 desc )
where rownum=2
oracle 子查询中有两个字段,怎么同时查出来
-- 先取并集,然后查询student2是否两条(根据id排序)
SELECT student FROM (SELECT student FROM A union SELECT student FROM B) a1,A a2 WHERE a2.student=a1.student and (SELECT count(*) FROM B GROUP BY student) = 2;
-- 或者
SELECT * FROM A a, B b WHERE a.student=b.student ORDER BY b.student HAVING COUNT(*)=2;
文章标题:oracle怎么并列查询 oracle 查询列
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