How to get comparing value

Question

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TblChatMaster

---------------------
ChatId    CreatedDate

 4           15/05/2013   

 5           16/05/2013

TblChatDesc

----------------------
id   ChatId   ReceiverId

 1     4           2

 2     4           3

 3     5           2

TblMessageMaster

---------------------------------

 id   ChatId  MsgText    MessengerId

  1     4      'Hi'         1

  2     5      'Hello'      1

I have ReceiverId and MessengerId.

Let we have,

MessengerId = 1
ReceiverId = 2,3

Now I want to get that ChatId which have messengerId=1 and ReceiverId=2 & 3
By above conclusion chatId should be 4

-----I am doing following way but it is not work

SQL

select cm.ChatId from TblChatMaster cm
 join TblChatDesc cd on cm.ChatId=cd.ChatId
 join TblMessageMaster mm on cm.ChatId=mm.ChatId where ReceiverId in(select * from dbo.Split('2,3')) and MessengerId=1

Posted 20-May-13 0:18am

rajesh@1989

Updated 20-May-13 0:21am

v2

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Comments

CHill60 20-May-13 6:31am

When you say "is not work" what happens, what doesn't happen or what error message do you get?

rajesh@1989 20-May-13 6:37am

It shown two different chatId 4 and 5

2 solutions

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Aarti Meswania · Answer 1 · 2013-05-20T00:35:00

Solution 1

make sure

select * from dbo.Split('2,3')

returns proper result

or try this

SQL

where (ReceiverId  = 2 or ReceiverId = 3)  and ...

Happy Coding!
:)

Posted 20-May-13 0:35am

Aarti Meswania

Updated 20-May-13 0:58am

v2

Comments

rajesh@1989 20-May-13 6:39am

Sorry I didn't explain it. dbo.Split is a method that is split the value into rows where comma is founded.

CHill60 · Answer 2 · 2013-05-20T00:38:00

Solution 2

Replace

where ReceiverId in(select * from dbo.Split('2,3'))

with

where ReceiverId in (2,3)

SQL

where cm.ChatId in (Select ChatId from tblChatDesc where ReceiverId = 2)
and cm.ChatId in (Select ChatId from tblChatDesc where ReceiverId = 3)

[Attempt 3!!]
I can't return temporary tables from a stored procedure in the version of SQL I'm currently using so you may need to tweak this code to make it work on your version and to simplify it
Basically, I'm using group by on both ChatId and ReceiverId to get a temporary table in the format

ChatId	ReceiverId	c
4	2			1
4	3			1
5	2			1

Then I'm using an outer select, also with a group by ... but this time I just want the ChatId and only if it appears in the temporary table exactly twice ...

SQL

select ChatId from
(
    select cm.ChatId, ReceiverId, count(*) as c
    from #ChatMaster cm
    join #ChatDesc cd on cm.ChatId=cd.ChatId
    join #MessageMaster mm on cd.ChatId=mm.ChatId
    where MessengerId=1
    and cm.ChatId in (Select ChatId from #ChatDesc where ReceiverId in (2,3))
    group by cm.ChatId, ReceiverId
) tmp
group by ChatId
having count(*) = 2 -- replace this 2 with the count of items returned by the split function

Posted 20-May-13 0:38am

CHill60

Updated 20-May-13 2:36am

v3

Comments

rajesh@1989 20-May-13 6:48am

It display two different chatId 4 and 5

CHill60 20-May-13 7:02am

I've updated my solution

rajesh@1989 20-May-13 7:32am

but how could I separate ReceiverId ? and ReceiverId may be 2,3,4 then By above conclusion I need to add an extra condition. How could I do that!!

CHill60 20-May-13 7:35am

So you are calling this code/function with a string that contains a comma-separated list of the values that you need?

rajesh@1989 20-May-13 8:04am

Yes, Exactly!!

CHill60 20-May-13 8:37am

I've had another go at it ... beware I've replaced tbl in your table names with a hash (#) as I couldn't create your tables on my database (and forgot to edit the sql before I pasted it!!)

rajesh@1989 21-May-13 1:58am

Thanks for deterministic help!!
It works but when I pass receiverId 3,4 and MessengerId 2 it display chatId. I think In this situation it should not return chatId.

As you said I wrote following procedure..
ALTER proc [dbo].[usp_StartChat]
(
@MessengerId int,
@ReceiversId varchar(200),
@MsgText varchar(max)
)
as
begin

declare @ChatIdTable table
(
ChatId int
)
declare @Temp table
(
Id int
)
declare @Temp2 table
(
Id int
)
declare @Original Table
(
Id int
)
declare @ChatId int
insert into @Temp select @MessengerId
insert into @Temp2 select * from dbo.Split(@ReceiversId)
insert into @Original select * from @Temp union all select * from @Temp2

insert into @ChatIdTable select cd.ChatId from TblChatMaster cm
join TblChatDesc cd on cm.ChatId=cd.ChatId
join TblMessageMaster mm on cm.ChatId=mm.ChatId where MessengerId in (select * from @Original)

select @ChatId=chatid from @ChatIdTable group by ChatId having COUNT(*)=(select COUNT(*) from dbo.Split(@ReceiversId))
if @ChatId is not null or @ChatId!=''
begin
....do something.. like...
insert into TblMessageMaster(ChatId, MsgText, MsgDate, MessengerId) values(@ChatId, @MsgText, sysdatetime(), @MessengerId)
select cm.ChatId, cd.ReceiverId, mm.MessengerId 'SenderId', mm.MsgText, convert(varchar(40), mm.MsgDate, 120) 'MsgDate' from TblChatMaster cm join TblChatDesc cd on cm.ChatId=cd.ChatId join TblMessageMaster mm on cm.ChatId=mm.ChatId where cm.ChatId=@ChatId
end
else
begin
....do..something.like.
insert into TblChatMaster(CreatedDate) values(sysdatetime())
select @ChatId=chatid from TblChatMaster where chatid=IDENT_CURRENT('TblChatMaster')
insert into TblChatDesc select @ChatId, * from dbo.Split(@ReceiversId)
insert into TblMessageMaster(ChatId, MsgText, MsgDate, MessengerId) values(@ChatId, @MsgText, sysdatetime(), @MessengerId)
select cm.ChatId, cd.ReceiverId, mm.MessengerId 'SenderId', mm.MsgText, convert(varchar(40), mm.MsgDate, 120) 'MsgDate' from TblChatMaster cm join TblChatDesc cd on cm.ChatId=cd.ChatId join TblMessageMaster mm on cm.ChatId=mm.ChatId where cm.ChatId=@ChatId

end
end

rajesh@1989 21-May-13 4:46am

If query is not possible from given table structure then I will change its structure as per your suggestion.