Comments on: SQL Server view column conversion problem

By: The Most-Watched IT Questions: July 20, 2010 - ITKE Community Blog

The Most-Watched IT Questions: July 20, 2010 - ITKE Community Blog — Tue, 20 Jul 2010 06:38:13 +0000

[...] Rmb1981 was having a SQL Server view column conversion problem and Mr. Denny and Carlosdl tried to help him [...]

By: carlosdl

carlosdl — Wed, 07 Jul 2010 14:20:37 +0000

Ok, I use SQL Server just for testing, so my knowledge is limited. I made a simplified test, and got no errors:

CREATE TABLE test_table (
v_swid VARCHAR(20),
i_other_column INTEGER)

INSERT INTO test_table VALUES ('1',1);
INSERT INTO test_table VALUES ('2',2);
INSERT INTO test_table VALUES ('CITY',10);
INSERT INTO test_table VALUES ('11',11);
INSERT INTO test_table VALUES ('CITY',20);
INSERT INTO test_table VALUES ('21',21);

CREATE VIEW v_test AS
SELECT CAST(v_swid AS INTEGER) swid, i_other_column
FROM test_table
WHERE v_swid != 'CITY';

SELECT * FROM v_test;

(4 row(s) affected)

SELECT * FROM v_test WHERE swid = 11;

(1 row(s) affected)

By: carlosdl

carlosdl — Tue, 06 Jul 2010 19:08:08 +0000

It could be just a typo, but you said the source column was varchar, but the error message says “…when converting the nvarchar value …”

If the records with non-numeric data were filtered out when creating the view and the column was in fact cast to a numberic data type, you should not get errors when querying the view using an integer as criteria.

Can you post the view creation command and the complete query that is giving the error ?