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I want to alter the date type in a database that has 40 tables from DATE type to CHAR(10) type, without opening the tables and manipulating them in Management Studio. i.e. only with a script/query.

I want to alter all columns of that type in any table in this database.

How can I do this?

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You want to say that you want to alter the data type of a column from DATE to CHAR(10) in a script and not in Management Studio? For a single column, all columns in a single table, all columns of all tables in your database? It's not very clear, so please try to get more details. Have you tried anything? –  Marian Feb 13 '13 at 8:03
    
@Marian ,I explain more and edit my question.I can do it for one table but I don't know how do it for all (or many) tables. –  Hamid Talebi Feb 13 '13 at 8:21

1 Answer 1

up vote 0 down vote accepted

A piece of code that does what you want is:

declare @sql nvarchar(max), @crlf char(2) = CHAR(13)+CHAR(10);

select @sql = isnull(@sql, '') + 'alter table ' + c.TABLE_SCHEMA + '.' + c.TABLE_NAME + ' alter column ' + c.COLUMN_NAME + ' CHAR(10)' + 
    + case when c.IS_NULLABLE = 'YES' then ' NULL;' else ';' end + @crlf
from INFORMATION_SCHEMA.COLUMNS c
where DATA_TYPE = 'date'

print @sql;
-- exec sp_executesql @sql --execute only after inspection!

But I would like to stress that you shouldn't normally do it on a system (except for dev/test purposes), because if it is Date information that you're using, you should be using the proper data type and avoid any other unnecessary cast.

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,Don't worry!I test this snippet code on a test DB at first time, then use it.BTW thanks so much.;) –  Hamid Talebi Feb 13 '13 at 13:29

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