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Linq query without using Joins for two tables distinct value

Table 1
Contract ID , Vendor Name, Description , user
Table 2
Contract ID , product , department
Match condition : for all the Contract ID matching with table 1 , get their Vendor Name and Contract ID
Query result output :
Contract ID(Distinct),Vendor Name
Below code using inner join , need same output without using join as linq query
\\
select table1.Contract ID,table1.Vendor Name ,table2.Contract ID
from table1 as s1
inner join table2 as s2
on s1.Contract ID=s2.Contract ID
\\\
Thanks in Advance

Considering you need only Join alternative to select distinct ,you can use inner query logic like below to write LINQ
SELECT contractorid ,vendor name
Where
Contracterid in
(Select distinct contractor id from table2)
Here assumption is contractorId is primary key in table 1

If I understand correctly, you want to retrieve a collection of objects containing Contract Id and Vendor Names, without duplicates, whose Contract Id is found in Table 2.
It is unclear if you are using Linq to objects, Linq to Entities, or any other Linq flavor, which would have a meaningful impact on how to best construct a query for a specific purpose.
But as a first hint, here is a way to perform this without join with Linq:
// Get a list of all distinct Contract Ids in Table 2
var AllTable2ContractIds = Table2
.Select(e => e.ContractId)
.Distinct()
.ToList();
// With Table 1
// Keep only entries whose contract Id is found in the list just contructed above.
// transform it to keep Contract Id and Vendor Name.
// The use of ToList() at the end is not mandatory.
// It depends if you want to materialize the result or not.
var Result = Table1
.Where(e => AllTable2ContractIds.Contains(e.ContractId))
.Select(e => new
{
e.ContractId,
e.VendorName
})
.ToList();

SQL statement having in which where clause have multiple values

I want to fill a ComboBox from database but I want two conditions of same column
table column Group contain four different values (rawmaterial, formula, packing , Chemical).
I want to select item names of group formula and packing
I am using the following query, but it's not working:
Select itemName from rawMaterial where Group = 'rawmaterial' , 'Packing'

Two alternatives:
Using OR:
Select itemName from rawMaterial where Group = 'rawmaterial' OR Group= 'Packing'
Using IN:
Select itemName from rawMaterial where Group IN ('rawmaterial' , 'Packing')

While Selecting based on ROWID - Distinct or Group By doesn't work in oracle

I have query like below , I tried to filter out duplicate columns by using Group BY
SELECT contacts.rowid AS ROW_PASS,
duty_rota.rowid AS ROW_PASS_ROTA,
duty_rota.duty_type AS DUTY_TYPE
FROM duty_rota,
duty_types,
contacts
WHERE duty_rota.duty_type = duty_types.duty_type
AND duty_rota.duty_officer = contacts.duty_id
AND sname IS NOT NULL
GROUP BY contacts.rowid,
duty_rota.rowid,
duty_rota.duty_type
ORDER BY duty_date
After playing with the query little bit I came to know we can't filter out distinct using group by while using ROWID. So can somebody please help me to write code (in SQL) with a logic that
if (any row is completely identical with another row of the query o/p)
{
then display only one column
}
I will be using the output as gridview's data source in C#, so if not in SQL - can you help me whether somehow in C# I can achieve to display only identical columns?

If you want to filter duplicate rows, you can use this query:
SELECT Max(duty_rota.rowid) AS ROW_PASS_ROTA,
duty_rota.duty_type AS DUTY_TYPE
FROM duty_rota,
duty_types,
contacts
WHERE duty_rota.duty_type = duty_types.duty_type
AND duty_rota.duty_officer = contacts.duty_id
AND sname IS NOT NULL
GROUP BY duty_rota.duty_type
ORDER BY DUTY_TYPE

Here you go: http://sqlfiddle.com/#!2/2a038/2
Take out the ROWID's. Example: If your table has 3 columns (colA, colB, colC) you could find exact row dups this way...
select a.* from
(
select count(*) dupCnt, colA, colB, colC from myTable
group by colA, colB, colC
) a
where dupCnt > 1

First, the ROWID is a unique field for each row, so using this field you will never have duplicates. The only solution here is to not use it. It's data does not hold anything you would want to display anyway.
Simply put, if you want no duplicates, you need the DISTINCT keyword:
SELECT DISTINCT field1,
field2
FROM table1,
table2
WHERE table1.key1 = table2.key1;
This will select all Field1, Field2 combinations from the two tables. Due to the DISTINCT keyword, each line will only be in the result list once. Duplicates will not be in the result list.
SELECT DISTINCT duty_rota.duty_type AS DUTY_TYPE
FROM duty_rota,
duty_types,
contacts
WHERE duty_rota.duty_type = duty_types.duty_type
AND duty_rota.duty_officer = contacts.duty_id
AND sname IS NOT NULL
ORDER BY duty_date
You will only need to GROUP BY if you need further operations on the result set, like counting the duplicates. If all you need is "no duplicates", the DISTINCT keyword is exactly what you are looking for.
Edit:
In case I misread your question and you want to see only those, that are duplicates, you need to group and you need to filter based on the groups criteria. You can do that using the HAVING clause. It's kind of an additional WHERE of the groups criteria:
SELECT FIELD1, FIELD2, COUNT(*)
FROM TABLE1, TABLE2
WHERE TABLE1.KEY1 = TABLE2.KEY1
GROUPB BY FIELD1, FIELD2
HAVING COUNT(*) > 1

Linq Query to Get Distinct Records from Two Tables

I have two Tables - tblExpenses and tblCategories as follows
tblExpenses
ID (PK),
Place,
DateSpent,
CategoryID (FK)
tblCategory
ID (PK),
Name
I tried various LINQ approaches to get all distinct records from the above two tables but not with much success. I tried using UNION and DISTINCT but it didnt work.
The above two tables are defined in my Model section of my project which in turn will create tables in SQLite. I need to retrieve all the distinct records from both the tables to display values in gridview.
Kindly provide me some inputs to accomplish this task. I did some research to find answer to this question but nothing seemed close to what I wanted. Excuse me if I duplicated this question.
Here is the UNION, DISTINCT approaches I tried:
DISTINCT # ==> Gives me Repetitive values
(from exp in db.Table<tblExpenses >()
from cat in db.Table<tblCategory>()
select new { exp.Id, exp.CategoryId, exp.DateSpent, exp.Expense, exp.Place, cat.Name }).Distinct();
UNION # ==> Got an error while using UNION

I think union already does the distict when you join the two tables you can try somethin like
var query=(from c in db.tblExpenses select c).Concat(from c in
db.tblCategory select c).Distinct().ToList();

You will always get DISTINCT records, since you are selecting the tblExpenses.ID too. (Unless there are multiple categories with the same ID. But that of course would be really, really bad design.)
Remember, when making a JOIN in LINQ, both field names and data types should be the same. Is the field tblExpenses.CategoryID a nullable field?
If so, try this JOIN:
db.Table<tblExpenses>()
.Join(db.Table<tblCategory>(),
exp => new { exp.CategoryId },
cat => new { CategoryId = (int?)cat.ID },
(exp, cat) => new {
exp.Id,
exp.CategoryId,
exp.DateSpent,
exp.Expense,
exp.Place,
cat.Name
})
.Select(j => new {
j.Id,
j.CategoryId,
j.DateSpent,
j.Expense,
j.Place,
j.Name
});

You can try this queries:
A SELECT DISTINCT query like this:
SELECT DISTINCT Name FROM tblCategory INNER JOIN tblExpenses ON tblCategory.categoryID = tblExpenses.categoryID;
limits the results to unique values in the output field. The query results are not updateable.
or
A SELECT DISTINCTROW query like this:
SELECT DISTINCTROW Name FROM tblCategory INNER JOIN tblExpenses ON tblCategory.categoryID = tblExpenses.categoryID;<br/><br/>
looks at the entire underlying tables, not just the output fields, to find unique rows.
reference:http://www.fmsinc.com/microsoftaccess/query/distinct_vs_distinctrow/unique_values_records.asp

Join data from two tables with autoincrement id from two databases

I would like to join data from tables from two databases. One is filed with predefined values (itemId, itemName) and other is filled by user (itemId, itemName, userId). Atributes itemId and itemName are the same, from first table we select all data, from second we select data by userId and combine these two results.
Joined data should be distinguish because ids are autoincrement and could be the same(doubled). We would like to fill drop down list with this data for example with datasource and dictionary (int is itemId, string is itemName) we could only have valueFiled and valueText in dropDownList but ids of these two tables could be the same and lather we don`t know from wich table is item selected by id.
Is there any elegant way to joint this, maybe with temp tables that we always when user is logged in join these two tables in temp table etc...
Thank you for your answers

I think you're looking for a union. Use a literal value to identify the source.
select 'predefined' as source, itemid, itemname
from predefined_values_table
union all
select 'user', itemid, itemname
from user_supplied_values_table
where userid = ?;
If you can accommodate only two columns, you might be able to use something like this instead. But you'll have to undo the string concatenation to get the id number.
select 'p:' || itemid, itemname
from predefined_values_table
union all
select 'u:' || itemid, itemname
from user_supplied_values_table
where userid = ?;