I have a situation where two tables should be joined with multiple columns with or condition. Here, I have a sample of sql query but i was not able to convert it into linq query.
select cm.* from Customer cm
inner join #temp tmp
on cm.CustomerCode = tmp.NewNLKNo or cm.OldAcNo = tmp.OldNLKNo
This is how i have write linq query
await (from cm in Context.CustomerMaster
join li in list.PortalCustomerDetailViewModel
on new { OldNLKNo = cm.OldAcNo, NewNLKNo = cm.CustomerCode } equals new { OldNLKNo = li.OldNLKNo, NewNLKNo = li.NewNLKNo }
select new CustomerInfoViewModel
{
CustomerId = cm.Id,
CustomerCode = cm.CustomerCode,
CustomerFullName = cm.CustomerFullName,
OldCustomerCode = cm.OldCustomerCode,
IsCorporateCustomer = cm.IsCorporateCustomer
}).ToListAsync();
But this query doesn't returns as expected. How do I convert this sql query into linq.
Thank you
You didn't tell if list.PortalCustomerDetailViewModel is some information in the database, or in your local process. It seems that this is in your local process, your query will have to transfer it to the database (maybe that is why it is Tmp in your SQL?)
Requirement: give me all properties of a CustomerMaster for all CustomerMasters where exists at least one PortalCustomerDetailViewModel where
customerMaster.CustomerCode == portalCustomerDetailViewModel.NewNLKNo
|| customerMaster.OldAcNo == portalCustomerDetailViewModel.OldNLKNo
You can't use a normal Join, because a Join works with an AND, you want to work with OR
What you could do, is Select all CustomerMasters where there is any PortalCustomerDetailViewModel that fulfills the provided OR:
I only transfer those properties of list.PortalCustomerDetailViewModel to the database that I need to use in the OR expression:
var checkProperties = list.PortalCustomerDetailViewModel
.Select(portalCustomerDetail => new
{
NewNlkNo = portalCustomerDetail.NewNlkNo,
OldNLKNo = portalCustomerDetail.OldNLKNo,
});
var result = dbContext.CustomerMasters.Where(customerMaster =>
checkProperties.Where(checkProperty =>
customerMaster.CustomerCode == checkProperty.NewNLKNo
|| customerMaster.OldAcNo == checkProperty.OldNLKNo)).Any()))
.Select(customerMaster => new CustomerInfoViewModel
{
Id = customerMaster.Id,
Name = customerMaster.Name,
...
});
In words: from each portalCustomerDetail in list.PortalCustomerDetailViewModel, extract the properties NewNKLNo and OldNLKNo.
Then from the table of CustomerMasters, keep only those customerMasters that have at least one portalCustomerDetail with the properties as described in the OR statement.
From every remaining CustomerMasters, create one new CustomerInfoViewModel containing properties ...
select cm.* from Customer cm
inner join #temp tmp
on cm.CustomerCode = tmp.NewNLKNo or cm.OldAcNo = tmp.OldNLKNo
You don't have to use the join syntax. Adding the predicates in a where clause could get the same result. Try to use the following code:
await (from cm in Context.CustomerMaster
from li in list.PortalCustomerDetailViewModel
where cm.CustomerCode == li.NewNLKNo || cm.OldAcNo = li.OldNLKNo
select new CustomerInfoViewModel
{
CustomerId = cm.Id,
CustomerCode = cm.CustomerCode,
CustomerFullName = cm.CustomerFullName,
OldCustomerCode = cm.OldCustomerCode,
IsCorporateCustomer = cm.IsCorporateCustomer
}).ToListAsync();
var result=_db.Customer
.groupjoin(_db.#temp ,jc=>jc.CustomerCode,c=> c.NewNLKNo,(jc,c)=>{jc,c=c.firstordefault()})
.groupjoin(_db.#temp ,jc2=>jc2.OldAcNo,c2=> c2.OldNLKNo,(jc2,c2)=>{jc2,c2=c2.firstordefault()})
.select(x=> new{
//as you want
}).distinct().tolist();
I am trying to pull data from a database to create a progress board fro some this query keeps returning for output."Data", even for values of projectId that actually exist in DB, project_id is an id that is inputted into the function.
-- FUNCTION: "ProjectProgress"."GetStepStatusbyProject"("Common"."InputDBMessage")
-- DROP FUNCTION "ProjectProgress"."GetStepStatusbyProject"("Common"."InputDBMessage");
CREATE OR REPLACE FUNCTION "ProjectProgress"."GetStepStatusbyProject"(
userinput "Common"."InputDBMessage")
RETURNS "Common"."OutputDBMessage"
LANGUAGE "plpgsql"
COST 100
VOLATILE
AS $BODY$
-- History:
-- 04/24/2020 Nick: Created Function
DECLARE
status_info jsonb;
input_params jsonb;
project_id bigint;
project_exists bool = true;
output "Common"."OutputDBMessage";
BEGIN
input_params := userinput."Parameters";
project_id := input_params ->> 'Id';
PERFORM "Log"."LogBeginRoutine"(userinput."UserName", userinput."ApplicationName", 'StepStatuses', 'GetStepStatusbyProject', userinput."ClientId", userinput."SessionId");
SELECT INTO project_exists (EXISTS(SELECT * FROM "LIMS"."Projects" WHERE "Id" = project_id));
IF NOT project_exists THEN
output."ErrorCode" = 1;
output."UserMessage" = 'project_id id not found';
ELSE
SELECT
array_to_json(array_agg(( ss.*, st."Color",st."Description",st."Icon"))) INTO status_info
FROM "LIMS"."Projects" as pr INNER JOIN "ProjectProgress"."Steps" as s
ON s."ProjectId" = pr."Id"
INNER JOIN (
SELECT
stepstatus.*
FROM
"ProjectProgress"."StepStatuses" AS stepstatus INNER JOIN
(
SELECT
MAX("Id") m_id, "StepId"
FROM
"ProjectProgress"."StepStatuses"
GROUP BY "StepId"
) AS mss ON mss.m_id = stepstatus."Id"
) as ss
ON ss."StepId" = s."Id"
INNER JOIN "ProjectProgress"."StatusTemplates" as st
ON ss."StatusTemplateId" = st."Id"
WHERE
st."Description" != 'Not Started' AND pr."Id" = project_id;
output."Data" := status_info;
output."ErrorCode" := 0;
output."UserMessage" := 'status successfully retrieved.';
PERFORM "Log"."LogEndSuccessRoutine"(userinput."UserName", userinput."ApplicationName", 'StepStatuses', 'GetStepStatusbyProject', userinput."ClientId", userinput."SessionId");
return output;
END
$BODY$;
I'm looking to update multiple rows in PostgreSQL in one statement. Is there a way to do something like the following?
UPDATE table
SET
column_a = 1 where column_b = '123',
column_a = 2 where column_b = '345'
You can also use update ... from syntax and use a mapping table. If you want to update more than one column, it's much more generalizable:
update test as t set
column_a = c.column_a
from (values
('123', 1),
('345', 2)
) as c(column_b, column_a)
where c.column_b = t.column_b;
You can add as many columns as you like:
update test as t set
column_a = c.column_a,
column_c = c.column_c
from (values
('123', 1, '---'),
('345', 2, '+++')
) as c(column_b, column_a, column_c)
where c.column_b = t.column_b;
sql fiddle demo
Based on the solution of #Roman, you can set multiple values:
update users as u set -- postgres FTW
email = u2.email,
first_name = u2.first_name,
last_name = u2.last_name
from (values
(1, 'hollis#weimann.biz', 'Hollis', 'Connell'),
(2, 'robert#duncan.info', 'Robert', 'Duncan')
) as u2(id, email, first_name, last_name)
where u2.id = u.id;
Yes, you can:
UPDATE foobar SET column_a = CASE
WHEN column_b = '123' THEN 1
WHEN column_b = '345' THEN 2
END
WHERE column_b IN ('123','345')
And working proof: http://sqlfiddle.com/#!2/97c7ea/1
For updating multiple rows in a single query, you can try this
UPDATE table_name
SET
column_1 = CASE WHEN any_column = value and any_column = value THEN column_1_value end,
column_2 = CASE WHEN any_column = value and any_column = value THEN column_2_value end,
column_3 = CASE WHEN any_column = value and any_column = value THEN column_3_value end,
.
.
.
column_n = CASE WHEN any_column = value and any_column = value THEN column_n_value end
if you don't need additional condition then remove and part of this query
Let's say you have an array of IDs and equivalent array of statuses - here is an example how to do this with a static SQL (a sql query that doesn't change due to different values) of the arrays :
drop table if exists results_dummy;
create table results_dummy (id int, status text, created_at timestamp default now(), updated_at timestamp default now());
-- populate table with dummy rows
insert into results_dummy
(id, status)
select unnest(array[1,2,3,4,5]::int[]) as id, unnest(array['a','b','c','d','e']::text[]) as status;
select * from results_dummy;
-- THE update of multiple rows with/by different values
update results_dummy as rd
set status=new.status, updated_at=now()
from (select unnest(array[1,2,5]::int[]) as id,unnest(array['a`','b`','e`']::text[]) as status) as new
where rd.id=new.id;
select * from results_dummy;
-- in code using **IDs** as first bind variable and **statuses** as the second bind variable:
update results_dummy as rd
set status=new.status, updated_at=now()
from (select unnest(:1::int[]) as id,unnest(:2::text[]) as status) as new
where rd.id=new.id;
Came across similar scenario and the CASE expression was useful to me.
UPDATE reports SET is_default =
case
when report_id = 123 then true
when report_id != 123 then false
end
WHERE account_id = 321;
Reports - is a table here, account_id is same for the report_ids mentioned above. The above query will set 1 record (the one which matches the condition) to true and all the non-matching ones to false.
The answer provided by #zero323 works great on Postgre 12. In case, someone has multiple values for column_b (referred in OP's question)
UPDATE conupdate SET orientation_status = CASE
when id in (66934, 39) then 66
when id in (66938, 49) then 77
END
WHERE id IN (66934, 39, 66938, 49)
In the above query, id is analogous to column_b; orientation_status is analogous to column_a of the question.
In addition to other answers, comments and documentation, the datatype cast can be placed on usage. This allows an easier copypasting:
update test as t set
column_a = c.column_a::number
from (values
('123', 1),
('345', 2)
) as c(column_b, column_a)
where t.column_b = c.column_b::text;
#Roman thank you for the solution, for anyone using node, I made this utility method to pump out a query string to update n columns with n records.
Sadly it only handles n records with the same columns so the recordRows param is pretty strict.
const payload = {
rows: [
{
id: 1,
ext_id: 3
},
{
id: 2,
ext_id: 3
},
{
id: 3,
ext_id: 3
} ,
{
id: 4,
ext_id: 3
}
]
};
var result = updateMultiple('t', payload);
console.log(result);
/*
qstring returned is:
UPDATE t AS t SET id = c.id, ext_id = c.ext_id FROM (VALUES (1,3),(2,3),(3,3),(4,3)) AS c(id,ext_id) WHERE c.id = t.id
*/
function updateMultiple(table, recordRows){
var valueSets = new Array();
var cSet = new Set();
var columns = new Array();
for (const [key, value] of Object.entries(recordRows.rows)) {
var groupArray = new Array();
for ( const [key2, value2] of Object.entries(recordRows.rows[key])){
if(!cSet.has(key2)){
cSet.add(`${key2}`);
columns.push(key2);
}
groupArray.push(`${value2}`);
}
valueSets.push(`(${groupArray.toString()})`);
}
var valueSetsString = valueSets.join();
var setMappings = new String();
for(var i = 0; i < columns.length; i++){
var fieldSet = columns[i];
setMappings += `${fieldSet} = c.${fieldSet}`;
if(i < columns.length -1){
setMappings += ', ';
}
}
var qstring = `UPDATE ${table} AS t SET ${setMappings} FROM (VALUES ${valueSetsString}) AS c(${columns}) WHERE c.id = t.id`;
return qstring;
}
I don't think the accepted answer is entirely correct. It is order dependent. Here is an example that will not work correctly with an approach from the answer.
create table xxx (
id varchar(64),
is_enabled boolean
);
insert into xxx (id, is_enabled) values ('1',true);
insert into xxx (id, is_enabled) values ('2',true);
insert into xxx (id, is_enabled) values ('3',true);
UPDATE public.xxx AS pns
SET is_enabled = u.is_enabled
FROM (
VALUES
(
'3',
false
,
'1',
true
,
'2',
false
)
) AS u(id, is_enabled)
WHERE u.id = pns.id;
select * from xxx;
So the question still stands, is there a way to do it in an order independent way?
---- after trying a few things this seems to be order independent
UPDATE public.xxx AS pns
SET is_enabled = u.is_enabled
FROM (
SELECT '3' as id, false as is_enabled UNION
SELECT '1' as id, true as is_enabled UNION
SELECT '2' as id, false as is_enabled
) as u
WHERE u.id = pns.id;
I have a table with just product ID's and category ID's (products can be in more than one category). How can I flatten the category ID's into a product column so I end us with this:
id | name | desc | categories
1 | test1 | lorem | 1,3,4,23
2 | test2 | ipsom | 4,6,24
It is like I need to loop into a separate table for the categories column. How can I do this or is there a better way?
I created an CLR aggregate function that takes a varchar column and returns all its values separated by commas. In other words, it joins several strings into a comma-separated list. I am sure its performance is way better than any T-Sql trick.
As any aggregate function, it can be used in combination with group by. For example:
SELECT id, name, desc, JoinStrings(CONVERT(VARCHAR(20), category_id))
FROM product p
INNER JOIN category_products c ON p.category_id = c.category_id
GROUP BY id, name, desc
Here's the C# code to create the CLR assembly into Sql Server 2008:
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
[Serializable]
[Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.UserDefined, IsInvariantToDuplicates=false, IsInvariantToOrder=false, IsInvariantToNulls=true, MaxByteSize=-1)]
public struct JoinStrings : IBinarySerialize
{
private char[] sb;
private int pos;
public void Init()
{
sb = new char[512000];
pos = 0;
}
public void Accumulate(SqlString Value)
{
if (Value.IsNull) return;
char[] src = Value.ToString().ToCharArray();
Array.Copy(src, 0, sb, pos, src.Length);
pos += src.Length;
sb[pos] = ',';
pos++;
}
public void Merge(JoinStrings Group)
{
Accumulate(Group.Terminate());
}
public SqlString Terminate()
{
if (pos <= 0)
return new SqlString();
else
return new SqlString(new String(sb, 0, pos-1));
}
public void Read(System.IO.BinaryReader r)
{
this.Init();
pos = r.ReadInt32();
r.Read(sb, 0, pos);
}
public void Write(System.IO.BinaryWriter w)
{
w.Write(pos);
w.Write(sb, 0, pos);
}
}
Here's the code to create the function (although deploying from Visual Studio should do it automatically):
CREATE AGGREGATE [dbo].[JoinStrings]
(#s [nvarchar](4000))
RETURNS[nvarchar](max)
EXTERNAL NAME [YouAssemblyName].[JoinStrings]
There's no in-built way to do it in MSSQL.
Simulating group_concat MySQL function in Microsoft SQL Server 2005? has a good description of how to go about implementing a workaround.
I would suggest using a Recursive CTE. I believe that it would be something like this:
select productid, categoryid,
row_number() over (partition by id order by categoryid) as rownum
into #tabletorecurse
from TABLENAME
with finaloutput as
(
select productid as id, name, desc, categoryid as categories, rownum
from #tabletorecurse
join PRODUCTTABLE
on PRODUCTTABLE.id = #tabletorecurse.productid
where rownum = 1
union all
select tr.id, tr.name, tr.desc,
finaloutput.categories + ', ' + tr.categoryid, tr.rownum
from #tabletorecurse as tr
join finaloutput
on finaloutput.rownum + 1 = tr.rownum
and finaloutput.id = tr.productid
)
select id, name, desc, categories
from finaloutput
join
(
select max(rownum) as maxrow, id
from finaloutput
group by id
) as maxvalues
on maxvalues.id = finaloutput.id
and maxvalues.maxrow = finaloutput.rownum
Use a function.
This does a lookup to text so you will need to adapt.
The COALESCE is just to put a ,.
This is from a large scale production application - it works and it fast.
Function was questioned by JustinPony as function is slow
I am hitting some tables of million of records but only returning 100 rows.
The function is only applied to the hundred rows.
usage:
select top 5 sID, ( select [dbo].[JoinMVEnum](docSVsys.sID, '140') ) as [Flag Issue]
from docSVsys
function
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE FUNCTION [dbo].[JoinMVText]
(
#sID int,
#fieldID tinyint
)
RETURNS VARCHAR(MAX)
AS
BEGIN
DECLARE #MVtextList varchar(max)
SELECT #MVtextList = COALESCE(#MVtextList + '; ', '') + docMVtext.value
FROM docMVtext with (nolock)
WHERE docMVtext.sID = #sID and fieldID = #fieldID
RETURN #MVtextList
END
GO
[NUnit.Framework.Test]
public void Test2()
{
NHibernate.ISession session = Z.Core.NHibernateCore.NHibernateHelper.GetCurrentSession();
var crit = session.CreateCriteria("_School");
crit.CreateCriteria("_ListStudent", "__ListStudent", NHibernate.SqlCommand.JoinType.LeftOuterJoin);
crit.Add(NHibernate.Criterion.Expression.Eq("__ListStudent.Name", "Abc"));
var list = crit.List();
Console.Write(list.Count);
}
NHibernate:
SELECT * FROM Tst_School this_ left outer join Tst_Student liststud1_ on this_.Guid=liststud1_.Guid WHERE liststud1_.Name = 'Abc'
How to create sql:
SELECT * FROM Tst_School this_ left outer join Tst_Student liststud1_ on this_.Guid=liststud1_.Guid AND liststud1_.Name = 'Abc'
Thanks
You should check WITH clause in HQL. I don't know if it's possible in CriteriaQuery.
http://nhforge.org/blogs/nhibernate/archive/2009/05/17/nhibernate-2-1-0-hql-with-clause.aspx