I had run following query in Oracle Database and produces following output:
Query: select id,name from member where name like 'A%';
ID Name
261 A....
706 Aaa.......
327 Ab.....
and more...
This Query returns 50 records and
I want to display 10 records at a time to user.
Since, ID does not contain data in autoincrement fashion, i cannot use between operator.
and rownum operator also doesn't help much.
Kindly Help.
Regards,
Ankit Agarwal
SELECT ID, Name
from (
select id,name, ROW_NUMBER() over( order by name) r
from member
where name like 'A%'
)
WHERE R between FromRowNum AND ToRowNum;
See http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:76812348057
Related
I am working on a query in hive. In that I am using aggregations like sum and case statements and group by clause. I have changed the column names and table names but my logic is same which I was using in my project
select
empname,
empsal,
emphike,
sum(empsal) as tot_sal,
sum(emphike) as tot_hike,
case when tot_sal > 1000 then exp(tot_hike)
else 0
end as manager
from employee
group by
empname,
empsal,
emphike
For the above query I was getting error as "Expression not in group by key '1000'".
So I have slightly modified the query and tried again My other query is
select
empname,
empsal,
emphike,
sum(empsal) as tot_sal,
sum(emphike) as tot_hike,
case when sum(empsal) > 1000 then exp(sum(emphike))
else 0
end as manager
from employee
group by
empname,
empsal,
emphike
For above query its putting me error as "Expression not in group by key 'Manager'".
When I add manager in the group by its showing invalid alias.
Please help me out here
I see three issues in your query:
1.) Hive cannot group by a variable you defined in the select block by the name you gave it right away. You will probably need a subquery for that.
2.) Hive tends to show errors when sum or count operations are not at the end of the query.
3.) Although I do not know what your goal is, I think that your query will not deliver the desired result. If you group by empsal there would be no difference between empsal and sum(empsal) by design. Same goes for emphike and sum(emphike).
I think the following query might solve these issues:
select
a.empname,
a.tot_sal,
a.tot_hike,
if(a.tot_sal > 1000, exp(a.tot_hike), 0) as manager
from
(select
empname,
sum(empsal) as tot_sal,
sum(emphike) as tot_hike,
from employee
group by
empname
)a
The if statement is equivalent to your case statement, however I find it a bit easier to read.
In this example you wouldn't need to group by after the subquery because the grouping is done in the subquery a.
I have a table with following data
Code Dest
atp ananthapur
blr bangalore
chn chennai
del delhi
hmp himachal
hyd hyderbad
goa goa
I need a query to fetch data such that the rows for codes 'hyd' and 'blr' would remain on top always, and then rest of the rows will follow.
I have done this as below -
select code,dest from (
select 1 rown,a.* from LOCATION a
where a.code in ('hyd','blr')
union
select 2 rown,b.* from LOCATION b
where b.code not in ('hyd','blr')
)
order by rown
I can think of doing it in some other ways also. But my question is -
Is there any oracle defined feature to accomplish this?
Yes, Oracle has such a feature, it's the ORDER BY expressions-list clause.
Try:
SELECT * FROM LOCATION a
ORDER BY
CASE WHEN a.code in ('hyd','blr') THEN 1 ELSE 2 END
i have a table in which i store the information (product id and description ) of all my products, description column is of type VarChar2(200). i want to format the output of this column in select statement to only result me specific part of output string. E.G Here is my simple select statement:
Select PRODUCTId, PRODUCT_DESC From ProductTable Order By PRODUCTId Desc;
this statement result me the output as:
ProductId Product_Desc
1 Oxford English-Oxford-Oxford Press-Textbook
now i want only the specific part of the output result from product_description column. i have already checked Trim() function but that did not helped me. can someone help me?
A substring function may help.
SELECT SUBSTR('ABCDEFG',3,4) "Substring"
FROM DUAL;
You can use SUBSTR() function. You can provide start and end position for the product_desc column.
The query should be like:
Select product_id,substr(product_desc,2,4) from producttable;
Here you'll get 4 chars from the second one.
I'm comfortable with SQL Server, but not so much with Oracle.
I've got a query that looks something like the following:
SELECT umr.region, payee_name, COUNT, corporate_office_name
FROM payers, offices,
(
SELECT region, h.payee_name, COUNT, company_name FROM someTable h, someTable2
GROUP BY region, h.payee_name, company_name
) umr
WHERE ...
I know that the example isn't complete, but the key to the question is what is the COUNT in the SELECT statement telling Oracle to do?
I'd say it means there's a column called count in one of the tables.
A weird request maybe but. My boss wants me to create an admin version of a page we have that displays data from an oracle query in a table.
The admin page, instead of displaying the data (query returns 1 row), needs to return the table name and column name
Ex: Instead of:
Name Initial
==================
Bob A
I want:
Name Initial
============================
Users.FirstName Users.MiddleInitial
I realize I can do this in code but would rather just modify the query to return the data I want so I can leave the report generation code mostly alone.
I don't want to do it in a stored procedure.
So when I spit out the data in the report using something like:
blah blah = MyDataRow("FirstName")
I can leave that as is but instead of it displaying "BOB" it would display "Users.FirstName"
And I want to do the query using select * if possible instead of listing all the columns
So for each of the columns I am querying in the * , I want to get (instead of the column value) the tablename.ColumnName or tablename|columnName
hope you are following- I am confusing myself...
pseudo:
select tablename + '.' + Columnname as WhateverTheColumnNameIs
from Table1
left join Table2 on whatever...
Join Table_Names on blah blah
Whew- after writing all this I think I will just do it on the code side.
But if you are up for it maybe a fun challenge
Oracle does not provide an authentic way(there is no pseudocolumn) to get the column name of a table as a result of a query against that table. But you might consider these two approaches:
Extract column name from an xmltype, formed by passing cursor expression(your query) in the xmltable() function:
-- your table
with t1(first_name, middle_name) as(
select 1,2 from dual
), -- your query
t2 as(
select * -- col1 as "t1.col1"
--, col2 as "t1.col2"
--, col3 as "t1.col3"
from hr.t1
)
select *
from ( select q.object_value.getrootelement() as col_name
, rownum as rn
from xmltable('//*'
passing xmltype(cursor(select * from t2 where rownum = 1))
) q
where q.object_value.getrootelement() not in ('ROWSET', 'ROW')
)
pivot(
max(col_name) for rn in (1 as "name", 2 as "initial")
)
Result:
name initial
--------------- ---------------
FIRST_NAME MIDDLE_NAME
Note: In order for column names to be prefixed with table name, you need to list them
explicitly in the select list of a query and supply an alias, manually.
PL/SQL approach. Starting from Oracle 11g you could use dbms_sql() package and describe_columns() procedure specifically to get the name of columns in the cursor(your select).
This might be what you are looking for, try selecting from system views USER_TAB_COLS or ALL_TAB_COLS.