UNION For Columns Of CLOB Data Type Does Not Work

May 10, 2007

I have two tables Encounter & Encounter_History. They have same columns. One column is of type CLOB. My requirement is to retrieve all the distinct records from both the tables with order by a date column. But problem is, UNION does not work in case of CLOB data type.

I know it will work if I use UNION ALL, but it returns duplicate records.

Please give me suggestion, how to solve this problem.

For example: The following query does not work since column1 is a CLOB data type

select column1 from table1
union
select column1 from table2

Thanks

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How Does Union/union All Work Inside SQL Server?

Apr 29, 2008



Why the sequence different?



select * from (

select id=3,[name]='Z'

union all select 1,'G'

union all select 2,'R'

union all select 4,'Z'

) as t

order by [name]

--result:

---------

--1 G

--2 R

--4 Z

--3 Z

select * from (

select id=3,[name]='Z'

union select 1,'G'

union all select 2,'R'

union all select 4,'Z'

) as t

order by [name]

--result:

----------

--1 G

--2 R

--3 Z--changed

--4 Z

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[Code] ....

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I have two questions...

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Mar 31, 2004

hi all

I have the following query which works fine when it's executed as a single query. but when i union the result of this query with other queries, it returns a different set of data.

any one know why that might be the case??


select top 100 max(contact._id) "_id", max(old_trans.date) "callback_date", 7 "priority", max(old_trans.date) "recency", count(*) "frequency" --contact._id, contact.callback_date
from topcat.class_contact contact inner join topcat.MMTRANS$ old_trans on contact.phone_num = old_trans.phone
where contact.phone_num is not null
and contact.status = 'New Contact'
group by contact._id
order by "recency" desc, "frequency" desc




i've included the union query here for completeness of the question



begin
declare @current_date datetime
set @current_date = GETDATE()


select top 100 _id, callback_date, priority, recency, frequency from
(
(
select top 10 _id, callback_date, 10 priority, @current_date recency, 1 frequency --, DATEPART(hour, callback_date) "hour", DATEPART(minute, callback_date) "min"
from topcat.class_contact
where status ='callback'
and (DATEPART(year, callback_date) <= DATEPART(year, @current_date))
and (DATEPART(dayofyear, callback_date) <= DATEPART(dayofyear, @current_date)) -- all call backs within that hour will be returned
and (DATEPART(hour, callback_date) <= DATEPART(hour, @current_date))
and (DATEPART(hour, callback_date) <> 0)
order by callback_date asc
--order by priority desc, DATEPART(hour, callback_date) asc, DATEPART(minute, callback_date) asc, callback_date asc
)
union
(
select top 10 _id, callback_date, 9 priority, @current_date recency, 1 frequency
from topcat.class_contact
where status = 'callback'
and callback_date is not null
and (DATEPART(year, callback_date) <= DATEPART(year, @current_date))
and (DATEPART(dayofyear, callback_date) <= DATEPART(dayofyear, @current_date))
and (DATEPART(hour, callback_date) <= DATEPART(hour, @current_date))
and (DATEPART(hour, callback_date) = 0)
order by callback_date asc
)
union
(
select top 10 _id, callback_date, 8 priority, @current_date recency, 1 frequency
from topcat.class_contact
where status = 'No Connect'
and callback_date is not null
and (DATEPART(year, callback_date) <= DATEPART(year, @current_date))
and (DATEPART(dayofyear, callback_date) <= DATEPART(dayofyear, @current_date))
and (DATEPART(hour, callback_date) <= DATEPART(hour, @current_date))
order by callback_date asc
)
union
(
select top 100 max(contact._id) "_id", max(old_trans.date) "callback_date", 7 "priority", max(old_trans.date) "recency", count(*) "frequency" --contact._id, contact.callback_date
from topcat.class_contact contact inner join topcat.MMTRANS$ old_trans on contact.phone_num = old_trans.phone
where contact.phone_num is not null
and contact.status = 'New Contact'
group by contact._id
order by "recency" desc, "frequency" desc
)
) contact_queue
order by priority desc, recency desc, callback_date asc, frequency desc

end

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SQL sentence that works:





Code Snippet

SELECT * FROM
(
SELECT 'O' Type, O.Name , OC.Name Contact, Birthday FROM OutletContact OC
INNER JOIN Outlet O ON OC.OutletID=O.OutletID
UNION
SELECT 'W' Type, W.Name,WC.Name Contact, Birthday FROM WholesalerContact WC
INNER JOIN Wholesaler W ON W.WholesalerID=WC.WholesalerID
) S
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Gorazd

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CAT 1 2 2
CAT 1 4 4
DOG 2 3 3
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UNION ALL

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101 dues Mem 100
101 Vol charity 200
101 chapt CHi 300

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101 mem 100 charity 200 chi 300

Error:
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Invalid column name 'PRODUCT_CODE'.
Server: Msg 207, Level 16, State 1, Line 2
Invalid column name 'product_code'.
Server: Msg 207, Level 16, State 1, Line 2
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p.product_code as Dues,
p.product_code as Vol
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product_code as Chapt,
Null as dues,
Null as Vol
from subscriptions
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union all

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At first I thought the problem is with the date, but then I can see
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Dim objDataCommand As SqlCommand
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version = VersionTextBox.Text

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SQL Server 2000 - Win Server 2003
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Hi,

The table in SQL has column Availability Decimal (8,8)

Code in c# using sqlbulkcopy trying to insert values like 0.0000, 0.9999, 29.999 into the field Availability
we tried the datatype float , but it is converting values to scientific expressions€¦(eg: 8E-05) and the values displayed in reports are scientifc expressions which is not expected
we need to store values as is


Error:
base {System.SystemException} = {"The given value of type SqlDecimal from the data source cannot be converted to type decimal of the specified target column."}

"System.InvalidOperationException: The given value of type SqlDecimal from the data source cannot be converted to type decimal of the specified target column. ---> System.InvalidOperationException: The given value of type SqlDecimal from the data source cannot be converted to type decimal of the specified target column. ---> System.ArgumentException: Parameter value '1.0000' is out of range.
--- End of inner exception stack trace ---
at System.Data.SqlClient.SqlBulkCopy.ConvertValue(Object value, _SqlMetaData metadata)
--- End of inner exception stack trace ---
at System.Data.SqlClient.SqlBulkCopy.ConvertValue(Object value, _SqlMetaData metadata)
at System.Data.SqlClient.SqlBulkCopy.WriteToServerInternal()
at System.Data.SqlClient.SqlBulkCopy.WriteRowSourceToServer(Int32 columnCount)
at System.Data.SqlClient.SqlBulkCopy.WriteToServer(DataTable table, DataRowState rowState)
at System.Data.SqlClient.SqlBulkCopy.WriteToServer(DataTable table)
at MS.Internal.MS
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Code in C#

SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnection, SqlBulkCopyOptions.Default);
DataRow dr;
DataTable dt = new DataTable();
DataColumn dc;

try
{

dc = dt.Columns.Add("Availability", typeof(decimal));
€¦.

dr["Availability"] = Convert.ToDecimal(s[2]); ------ I tried SqlDecimal
€¦€¦€¦.

}
bulkCopy.DestinationTableName = "dbo.[Tbl_Fact_App_Server_AvailPerMinute]";
bulkCopy.WriteToServer(dt);



thx



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