我有这样的桌子：
ID_School name
--------------------
ACH001 jack
ACH001 gon
ACH001 fanny
ACH001 tony
ACH002 vera
ACH002 jessica
ACH003 rey
ACH003 tomy
我想输出这个表中的最大记录ID_School，输出如下：
ID_School count
-----------------
ACH001 4
在MS SQL中：
select top 1 ID_School, count(*) IdCount
from school
group by ID_School
order by IdCount desc
就是这样：
选择ID_school，按名称从学校组中按总降序限制1计算（ID_schoool）为总数
对于Oracle：
SELECT id_school, cnt
FROM (SELECT id_school, count(*) cnt
FROM school
GROUP BY id_school
ORDER BY cnt)
WHERE ROWNUM = 1;
I noticed that there were some threads with similar questions, and I did look through them but did not really get a convincing answer. Here s my question: The subquery below returns a Table with 3 ...
I m 查询Oracle 10g。 我有两张表格(样本数据见下文)。 i m 试图提取一些领域
We have a restaurant table that has lat-long data for each row. We need to write a query that performs a search to find all restaurants within the provided radius e.g. 1 mile, 5 miles etc. We have ...
What are some cool SQL shorthands that you know of? For example, something I learned today is you can specify to group by an index: SELECT col1, col2 FROM table GROUP BY 2 This will group by col2
I have an array of output from a database. I am wondering what the cleanest way to filter the values is example array Array ( [0] => Array ( [title] => title 1 ...
we have a table in an Oracle Database which contains a column with the type Char(3 Byte). Now we use a parameterized sql to select some rows with a DBNull.Value and it doesn t work: OracleCommand ...
I have a SQL-statement like this: SELECT name FROM users WHERE deleted = 0; How can i create a result set with a running number in the first row? So the result would look like this: 1 Name_1 2 ...
I’m developing an application dedicated to generate statistical reports, I would like that user after saving their stat report they save sql queries too. To do that I wrote the following module: ...