Error 1000: AFx Library library exception: Sql encountered an error: These columns don't currently have unique values.

Question

Hi everyone,
Using the Writer block, configured with a correct SQLAzure instance, I experience this error:
- Error 1000: AFx Library library exception: Sql encountered an error: These columns don't currently have unique values.
I have read that this error can be related to inheritance problems, but my table does not have inheritances of any kind:
CREATE TABLE [dbo].[my_table](
[my_float] [float] NULL
) ON [PRIMARY]
GO
Writer block parameters:
Comma separated list of columns to be saved:
temp      (from Bike Rental UCI Dataset)
Data Table name: [dbo].[my_table]
Comma separated list of datatable columns:
[my_float]
The experiment from which I have extracted the writing part was able to correctly write to DB until few days ago. Is it possible that some changes in the platform are causing this issue or am I doing something wrong?
Thank you and best regards,
FV

Answer 1

Hi Maureen,
Yes, the scenario is correct. On SQL profiler I can't see any SQL operation that can lead to that kind of error, but as you were saying it was worth trying anyway having that error message.
New test scenario:
CREATE TABLE [dbo].[my_table_identity](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [my_float] [float] NULL,    
 CONSTRAINT [PK_my_table_identity] PRIMARY KEY CLUSTERED 
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON)
) ON [PRIMARY]
-- These lines work fine on SQL Management Studio
INSERT INTO [dbo].[my_table_identity] (my_float) VALUES (1.23)
INSERT INTO [dbo].[my_table_identity] (my_float) VALUES (1.23)
INSERT INTO [dbo].[my_table_identity] (my_float) VALUES (1.23)
-- I can see all new rows with each one a different ID
SELECT * FROM [dbo].[my_table_identity]
dbo is the default schema for my Azure login.
New writer block parameters:
Comma separated list of columns to be saved: temp  
   (from Bike Rental UCI Dataset)
Data Table name: my_table_identity
Comma separated list of datatable columns: my_float
I still get the same error: Error 1000: AFx Library library exception: Sql encountered an error: These columns don't currently have unique values.
I have also tried to pass the "instant" column instead of "temp", as it hasn't any duplicated values, but still no luck.
I attach the log file (purged of sensitive information) because I see some error / warnings there.
https://dl.dropboxusercontent.com/u/40411467/azure_log.txt
Thank you again and best regards,
FV