Bonnie thanks for your help.

I am runing the code within SQL Query Analyzer.

Here is the code :

CREATE TABLE doc_exa ( column_a INT)
GO
ALTER TABLE doc_exa ADD column_b VARCHAR(20) NULL
GO





But when I issue the following :

ALTER TABLE doc_exa ALTER COLUMN column_b VARCHAR(50) NULL

I get the following error:

Server: Msg 170, Level 15, State 1, Line 1
Line 1: Incorrect syntax near 'COLUMN'.



Sergio