I have 2 tables which looks like this:
ARTICLES TABLE:
and the output should look like this:
How can I accomplish this using both sql query (i'm using sql server 2005) and using linq to sql query ?
BTW i'm using sql server 2005, asp.net with c# in Visual studio 2008.
Please help me
Thanks in anticipation
Update: Added Linq experssion that can be used if you require an OUTER join.
INNER JOIN
For an inner join ie. only get back the articles that have been bought at least once, you can use the following.
LINQ 2 SQL
from a in Articles
join c in CustomersRecords on
a.Article_Name equals c.Article_Name
group a by new {a.SNo, a.Article_Name} into g
select new
{
SNo = g.Key.SNo,
Article_Name = g.Key.Article_Name,
Total_Items_Bought = g.Count()
}
The above translates to the following SQL
SELECT COUNT(*) AS [Total_Items_Bought], [t0].[SNo], [t0].[Article_Name]
FROM [Articles] AS [t0]
INNER JOIN [CustomersRecord] AS [t1] ON [t0].[Article_Name] = [t1].[Article_Name]
GROUP BY [t0].[SNo], [t0].[Article_Name]
Which when cleaned-up a little gives you
SELECT a.SNo,
a.Article_Name,
COUNT(*) AS Total_Items_Bought
FROM Articles AS a
INNER JOIN CustomersRecord AS c ON a.Article_Name = c.Article_Name
GROUP BY a.SNo, a.Article_Name
LEFT OUTER JOIN
For a left outer join ie. get back all articles event those that have never been bought, you can use the following.
LINQ 2 SQL
from a in Articles
join c in CustomersRecords on
a.Article_Name equals c.Article_Name into apc
select new
{
SNo = a.SNo,
Article_Name = a.Article_Name,
Total_Items_Bought = apc.Count()
}
This translates to the following SQL
SELECT [t0].[SNo], [t0].[Article_Name], (
SELECT COUNT(*)
FROM [CustomersRecord] AS [t1]
WHERE [t0].[Article_Name] = [t1].[Article_Name]
) AS [Total_Items_Bought]
FROM [Articles] AS [t0]
select
A.SNo,
A.Article_Name,
count(C.Article_Name) as Total_Items_Bought
from Articles as A
left outer join CustomersRecord as C
on A.Article_Name = C.Article_Name
group by A.SNo, A.Article_Name
order by A.SNo
Use this for SQL
SELECT
SNO,Article_Name,
(SELECT COUNT(*) FROM CustomersRecord AS cr
WHERE cr.Article_Name = Article_Name) AS Total_Items_Bought
FROM ARTICLES
Related
I almost have my EF Core query working... This is the SQL getting produced (notice the Count(*):
SELECT [u].[Key], [u].[Url], [u].[CreatedBy], [u].[CreatedOn], COUNT(*) AS [Clicks]
FROM [URLs] AS [u]
LEFT JOIN [OwnerUrls] AS [o] ON [u].[Key] = [o].[ShortUrlKey]
LEFT JOIN [Clicks] AS [c] ON [u].[Key] = [c].[ShortUrlKey]
GROUP BY [u].[Key], [u].[Url], [u].[CreatedBy], [u].[CreatedOn]
What I need is (have Count look at a specific column/table)
SELECT [u].[Key], [u].[Url], [u].[CreatedBy], [u].[CreatedOn], COUNT(c.ID) AS [Clicks]
FROM [URLs] AS [u]
LEFT JOIN [OwnerUrls] AS [o] ON [u].[Key] = [o].[ShortUrlKey]
LEFT JOIN [Clicks] AS [c] ON [u].[Key] = [c].[ShortUrlKey]
GROUP BY [u].[Key], [u].[Url], [u].[CreatedBy], [u].[CreatedOn]
Here is the EF Query that I'm using...
query = (from u in db.URLs
join ou in db.OwnerUrls on u.Key equals ou.ShortUrlKey into urlOwners
from subSet in urlOwners.DefaultIfEmpty()
join c in db.Clicks on u.Key equals c.ShortUrlKey into urlClicks
from subClicks in urlClicks.DefaultIfEmpty()
group subClicks by new { u.Key, u.Url, u.CreatedBy, u.CreatedOn } into g
select new ShortURL()
{
Key = g.Key.Key,
Url = g.Key.Url,
CreatedBy = g.Key.CreatedBy,
CreatedOn = g.Key.CreatedOn,
Clicks = g.Count()
});
I've tried changing the g.Count() to g.Select(x=>x.Id).Count() and that just causes EF Core to barf and complain about client side evaluation vs server side evaluation etc..
I should mention that the reason I'm joining the first model (OwnerUrls) is to support a where clause that I didn't include here...
Thanks!
I'm not a EF developer, but have worked with SQL Server for a while now. In SQL Server i would use COUNT(DISTINCT c.ID) to eliminate any duplicates you might get from JOINS.
If duplicates are impossible due to the model the COUNT(*) shoud be sufficient.
Maybe this might help:
https://entityframeworkcore.com/knowledge-base/51892585/linq-select-distinct-count-performed-in-memory
I want in put two queries in one statement how can i do that in this state?
1
stmt = `SELECT Comments.*, Users.username,Users.avatar from Users
INNER JOIN Comments ON Comments.users_id =Users.users_id
WHERE Comments.post_id= 1`
2
`SELECT COUNT(*) comment FROM Comments WHERE Comments.post_id= 1`;
Cross join the 1st query to the 2nd:
SELECT c.*, u.username, u.avatar, t.counter
FROM Users u INNER JOIN Comments c
ON c.users_id = u.users_id
CROSS JOIN (SELECT COUNT(*) counter FROM Comments WHERE post_id = 1) t
WHERE c.post_id = 1
I don't know much about SQLite, but in SQL Server you can use ";" to use multiple queries.
Maybe it does work for SQLite.
You can use GROUP BY on comments table in a way:
'SELECT COUNT(Comments.<id>), Comments.*, Users.username,Users.avatar
from Users INNER JOIN Comments ON Comments.users_id =Users.users_id
WHERE Comments.post_id = 1 GROUP BY Comments.<id>';
*This syntax of GROUP BY clause follows PostgreSQL. You might need to tweak according to the syntax followed by sqlite.
i want to rebuild this SQL Query as AX Query.
I tried it in several ways, but I don't get it.
I am not completely new to AX queries, but I only have experience with some simple queries not with such complex SQL queries.
SELECT * FROM ( SELECT DH.[RECID] AS RECID_DIMENSIONHIERARCHY
,DH.[NAME] AS NAME__DIMENSIONHIERARCHY
,DH.[DESCRIPTION] AS DESC__DIMENSIONHIERARCHY
,DH.[PARTITION] AS PARTITION_DIMENSIONHIERARCHY
,DL.[DIMENSIONATTRIBUTE] AS RECID_DIMENSIONATTRIBUTE
,DA.[NAME] AS NAME_DIMENSIONATTRIBUTE
,DN.[RECID] AS RECID_DIMENSIONCONSTRAINTNODE
,DNC.[RECID] AS RECID_DIMENSIONCONSTRAINTNODECRITERIA
,DNC.[RANGETO] AS #Owner
,DNCR.[WILDCARDSTRING] AS #Agreement
FROM (SELECT * FROM [dbo].[DIMENSIONHIERARCHY]
WHERE [STRUCTURETYPE] = 1 AND [NAME] LIKE 'AG-OW%'
) AS DH
INNER JOIN [dbo].[DIMENSIONHIERARCHYLEVEL] AS DL
ON DH.[RECID] = DL.[DIMENSIONHIERARCHY]
AND DH.[PARTITION] = DL.[PARTITION]
INNER JOIN [dbo].[DIMENSIONATTRIBUTE] AS DA
ON DL.[DIMENSIONATTRIBUTE] = DA.[RECID]
AND DL.[PARTITION] = DA.[PARTITION]
INNER JOIN [dbo].[DIMENSIONCONSTRAINTNODE] AS DN
ON DL.[RECID] = DN.[DIMENSIONHIERARCHYLEVEL]
AND DL.[PARTITION] = DN.[PARTITION]
INNER JOIN [dbo].[DIMENSIONCONSTRAINTNODECRITERIA] AS DNC
ON DN.[RECID] = DNC.[DIMENSIONCONSTRAINTNODE]
AND DN.[PARTITION] = DNC.[PARTITION]
INNER JOIN [dbo].[DIMENSIONCONSTRAINTNODECRITERIA] AS DNCR
ON DN.[PARENTCONSTRAINTNODE] = DNCR.[DIMENSIONCONSTRAINTNODE]
AND DN.[PARTITION] = DNCR.[PARTITION]
) AS Sub
You need to break down your query and implement it in small chunks. Then combine all of it to get the desired result.
There are two ways to create query in X++.
Create query using select statement for example:
Select * from HcmWorker join * from DirPerson
where DirPerson.RecId == HcmWorker.Person
See this link : Select statement syntax
Create query with AOT structure. You might want to have a look at the following link:
Create query in AOT by using X++
The following code works fine in T-SQL, but not in JET SQL, in Access:
UPDATE Superliste_Temp
SET [Plan-TGrp-Spanne_Stfl1] =
(SELECT [Plan-TGrp-Spanne_Stfl1]
FROM Superliste_Temp
INNER JOIN dbo_Common_preferences
ON Superliste_Temp.Teil = dbo_Common_preferences.AktivesTeil)
WHERE [Teilegruppe] =
(SELECT [Teilegruppe]
FROM Superliste_Temp
INNER JOIN dbo_Common_preferences
ON Superliste_Temp.Teil = dbo_Common_preferences.AktivesTeil);
Why does it not work!?
I have a hard time looking at that SQL to figure out what it's trying to do, but I know that Jet SQL needs the SET statement after the JOINS, so my best guess is:
UPDATE Superliste_Temp, Superliste_Temp AS ST1
INNER JOIN dbo_Common_preferences AS pref1
ON ST1.Teil = pref1.AktivesTeil
SET Superliste_Temp.[Plan-TGrp-Spanne_Stfl1] = [ST1]![Plan-TGrp-Spanne_Stfl1]
WHERE (((Superliste_Temp.Teilegruppe)=[ST1]![Teilegruppe]));
I have three tables: users, projects, user_project
user_project contains user_id, project_id and role_id, where user_id and project_id are both primary keys connected to projects.project_id and users.user_id.
I want to get the the name and surname of all the users from the users table that has to do with a certain project from the projects table through user_project.
What SQL statement do I have to use? I was thinking something like this:
SELECT
users.name, users.surname
FROM users
WHERE users.user_id = user_project.user_id AND projects.project_id = #parameter
I am using SQL Server 2012 and ASP.NET/VB.NET.
Db Diagram:
http://i.imgur.com/lrv52wO.png
SELECT users.name, users.surname
FROM users u
INNER JOIN user_project up
ON u.user_id = up.user_id
WHERE up.project_id = #parameter
You'll need to join to your other tables - either from Users through User_Project all the way to Projects if you want to base your selection on something in the Projects table:
SELECT
u.name, u.surname
FROM users u
INNER JOIN user_project up ON u.user_id = up.user_id
INNER JOIN project p ON p.project_id = up.project_id
WHERE p.project_name = 'something'
or at least to the link table, if you can use the project_id as criteria:
SELECT
u.name, u.surname
FROM users u
INNER JOIN user_project up ON u.user_id = up.user_id
WHERE up.project_id = #parameter
Update: assuming your Role table is connected to Users through again a link table Users_role then you need this to select role name, too:
SELECT
u.name, u.surname,
RoleName = r.Name
FROM users u
INNER JOIN user_project up ON u.user_id = up.user_id
INNER JOIN user_roles ur ON u.user_id = ur.user_id
INNER JOIN role r ON ur.role_id = r.role_id
WHERE up.project_id = #parameter
SELECT
users.name, users.surname
FROM users
inner join user_project
on users.user_id = user_project.user_id
WHERE user_project.project_id = #parameter
This should do it.
SELECT users.name, users.surname
FROM users
INNER JOIN user_project ON user_project.user_id = users.user_id
WHERE (user_project.project_id = #parameter)
The important line here is the line that starts INNER JOIN. You don't need the project table as the project_id column is in user_project. If you wanted to get the project name for example you would need the project table. You would do this by writing another INNER JOIN.
INNER JOIN project ON project.project_id = user_project.project_id
Now that you have joined you can access all the columns in the project table.