我正试图计算出去医生的旅行,并总结了多少费用。我正在使用ORACLE XE 11g和SQL Developer。我想这样做与在选择相关子查询,但我得到这个消息: ORA-00937: not a single-group group function
00937. 00000 - "not a single-group group function"
*Cause:
*Action:
E
我的情况与下面讨论的示例几乎相同。 select data where date is max(date) less than x 我有表作为 s_currency cdate ratio currency
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2017
问题!我试图列出所有书籍及其相应的图书主题,平均成本和常规成本。 到目前为止,我查询... SELECT BOOK_SUBJECT, AVG(BOOK_COST)
FROM BOOK
GROUP BY BOOK_SUBJECT
该查询给了我四组总成本的平均。 Final out put should look like this我需要携带BOOK_NUM,BOOK_TITLE,BOOK_S
select语句列SQL是有办法让SQLAlchemy中生成一个自定义列,它是与当前行相关子查询的查询:使用ORM API SELECT
tab1.id,
tab1.col1,
...,
(
SELECT count(1) FROM tab2
WHERE tab2.tab1_id = tab1.id
GROUP BY tab2.col1
) as cnt
F
如果我有: 2 baskets of oranges with 7 and 10 each
3 baskets of peaches with 12 and 15 each
然后我想设置: for every orange basket value of maxfruit to 10 and
for every peach basket value of maxfruit to 15
林混淆的名称为什么不能 Select x.continent, x.name
From world x
Where x.name <= ALL (select y.name from world y where x.name=y.name)
ORDER BY name
谁能请给我解释一下为什么它必须是x.continent = y.continent而不是x.name = y.name?
假设我们有以下四个表: create table table_x(x number, title varchar2(100));
create table table_y(y number, x number, title varchar2(100));
create table table_z(z number, y number, x number, title varchar2(10