I have many tables.But there are Two columns common in each table.
They are RegNo and Total.Now i want the values of all the total column for a particular RegNo.
I can get that in different queries like this.
query=from k in db.MyTable1 where K.regNo=1 select k.Total
query2=from k in db.MyTable2 where K.regNo=1 select k.Total
This way but i want to do this and get the Summation of all Total's Column using one single Query
Please guide.
You can do it this way.
var itemCounts = (from k in db.MyTable1 where k.RegNO==1 select k.Total)
.Union(from k in db.MyTable2 where k.RegNO==1 select k.Total);
TotalOfAll=itemCounts.Sum();
and using the sum method you can get the summation of all the Values in the query.
Related
I have table[Table 1] having three columns
OrganizationName, FieldName, Acres having data as follows
organizationname fieldname Acres
ABC |F1 |0.96
ABC |F1 |0.96
ABC |F1 |0.64
I want to calculate the sum of Distinct values of Acres
(eg: 0.96+0.64) in DAX.
One of the problems with doing what you want is that many measures rely on filters and not actual table expressions. So, getting a distinct list of values and then filtering the table by those values, just gives you the whole table back.
The iterator functions are handy and operate on table expressions, so try SUMX
TotalDistinctAcreage = SUMX(DISTINCT(Table1[Acres]),[Acres])
This will generate a table that is one column containing only the distinct values for Acres, and then add them up. Note that this is only looking at the Acres column, so if different fields and organizations had the same acreage -- then that acreage would still only be counted once in this sum.
If instead you want to add up the acreage simply on distinct rows, then just make a small change:
TotalAcreageOnDistinctRows = SUMX(DISTINCT(Table1),[Acres])
Hope it helps.
Ok, you added these requirements:
Thank You. :) However, I want to add Distinct values of Acres for a
Particular Fieldname. Is this possible? – Pooja 3 hours ago
The easiest way really is just to go ahead and slice or filter the original measure that I gave you. But if you have to apply the filter context in DAX, you can do it like this:
Measure =
SUMX(
FILTER(
SUMMARIZE( Table1, [FieldName], [Value] )
, [FieldName] = "<put the name of your specific field here"
)
, [Value]
)
I have two tables, one called STUDENTS and the other CLASSES. I have to select all the students that are from the same class of one student, and this student has his own number id, and through this number id that I have to select everything.
TABLE STUDENTS
nr_rgm
nm_name
nm_father
nm_mother
dt_birth
id_sex
TABLE CLASSES
cd_class
nr_schoolyear
cd_school
cd_degree
nr_series
cd_class
cd_period
So I tried something like that :
SELECT count(*) FROM students, classes WHERE id_sex = 'M' AND
cd_class = (SELECT cd_class FROM classes WHERE nr_rgm = '12150');
But then it points an error, and the error is the follow :
single-row subquery returns more than one row
So, how can I make this work ?
you should use "in" and not "=" when applying subselects.
I think what you really would want to do is to simply join the two tables together rather than issuing a sub select:
SELECT count(*)
FROM students s, classes c
WHERE s.id_sex = 'M' AND c.nr_rgm = '12150' AND s.cd_class = c.cd_class;
This way you just tell the database: Please count all the occurrences where my students.id_sex = 'M' and my classes.nr_rgm = '12150' AND all found studends.cd_class match those of my classes.cd_class.
The reason why your statement above fails is because the ordinary = operation, when not used in a join, will only expect one single value, like you do with s.id_sex='M' while your statement returns multiple values. To cope with that you have to use the IN operator which operates on lists.
However, you can and will achieve the very same with just joining the two tables together, and it will be much more efficient on bigger data sets.
One more note to the example above. If classes.nr_rgm is a field of data type NUMBER, don't use the ' around the value 12150 as it will lead to implicit type conversion. With other words, '12150' is a string and will have to be converted to NUMBER first before doing a comparison.
I have to write two LINQ query,which one returns the TOP 6 rows and the another which return data excluding the TOP 6 rows:
TOP 6:
from m in MyTable
take 6
select m.Foo
I need help how to figure out the second query.
Try MyTable.Skip(6). I don't think there is a way to do this in the query syntax. Read more about Take and Skip here and here.
Use Except (according to your C# like syntax):
var fullList = from m in MyTable select m.Foo;
var top6 = from m in MyTable take 6 select m.Foo;
var top6except = fullList.Except(top6);
This exclude the TOP 6 rows retrieved and not generally the top 6 rows. Use Skip method to achieve the generic "select starting from 7th row"
To take all but the first 6 rows, use Skip():
var allButFirst6 = (from m in MyTable
select m.Foo).Skip(6);
Please note that some LINQ providers require the list to be ordered in order to use Skip and Take. If this is the case, then use OrderBy to order the list before using Skip or Take.
I can find empirical distribution that way
select command_type, duration, round(percentage, 2)
from (select distinct command_type,duration_sec,
percent_rank() over(partition by command_type order by duration) percentage
from command_durations
order by 1, 2)
The question is how to do the same using oracle model clause. I have started with this
select command_type,duration,dur_count from command_durations
model UNIQUE SINGLE REFERENCE
partition by (command_type)
dimension by ( duration)
measures(0 dur_count)
rules(
dur_count[duration]=count(1)[cv(duration)]
)
order by command_type,duration
But now I need to make records distinct, in order to be able to proceed with finding empirical distribution.
How to do the records distinct in the model clause?
If you want to take that query and use 'distinct' on it, one method might be to wrap that in a From Subquery statement, and then do a distinct. For instance:
Select Distinct command_type, duration, dur_count
From (
[Your Code]
)
Let me know if that works.
I am working in C#.Net and Oracle. i am passing a string to a query. i had used this code for concating all the item id's
List<string> listRetID = new List<string>();
foreach (DataRow row in dtNew.Rows)
{
listRetID.Add(row[3].ToString());
}
This concatination goes above 10,000. so i am getting the error message like this..
ORA-01795: maximum number of expressions in a list is 1000
How to fix this..
The documentation states:
A comma-delimited list of expressions can contain no more than 1000
expressions. A comma-delimited list of sets of expressions can contain
any number of sets, but each set can contain no more than 1000
expressions.
Presumably you're using this string as the contents of in IN (...) restriction, in which case there isn't really anything you can do - this just won't work. A common way to work around this is to generate a dummy table as a subquery or common table expression (CTE) and joining to that, but I'm not sure how you'd translate your List - possibly similar to whatever you're doing with your IN clause. You'd want to end up with your query looking something like:
with tmp_tab as (
select <val1 from list> as val from dual
union all select <val2 from list from dual
union all select <val3 from list from dual
...
)
select <something>
from <your table> yt
join tmp_tab tt on yt.<field> = tt.val
But that requires generating the entire (huge) query including the CTE each time you run it, and there's no opportunity to use bind variables.
You might find something like this approach more palatable.
You can have 10 lists of 1000 items instead of 1 list of 10000 items.
WHERE some_column IN (1,2,...,1000)
OR some_column IN (1001,1002,...2000) -- etc.
Not a C# guy but I would just split the list listRetID in multiple lists or create a list of lists
Then loop through that list of lists and perform the query on each element of the list.
What is the intent of your query?
It looks like you are selecting rows that have some column equal to the 3rd column of one of the records of some query.
The correct way of doing this is either an SQL join or a subquery. There is absolutely no need to bring this into C# code. For example, using a subquery you can write something like this:
SELECT *
FROM atable
WHERE afield IN (
SELECT field3
FROM someothertable)