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Alter many tables at once with the same column name

Posted on 2006-11-12
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Last Modified: 2012-06-21
I am running SQL server 2005

Is there a way to change all columns with the same name from char(2) to char(3)?

There are over 150 tables in the schema that have to be altered.

Thanks in advance.
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Question by:parikaa
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5 Comments
 
LVL 75

Expert Comment

by:Aneesh Retnakaran
ID: 17928380
run this

SELECT 'ALTER TABLE '+TABLE_NAME +' ALTER COLUMN '+COLUMN_NAME +' CHAR(3)'
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'putTableName'
AND COLUMN_NAME  = 'puturColumnName'

Take the output and paste it on a new query page and run that
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 17928390
you could script out all the changes to be done by querying the system view sys.columns on limiting to those having data type char and length 3.

select ' ALTER TABLE [' + object_name(object_id) + '] ALTER [' + column +'] CHAR(3) '
from sys.columns
where max_length = 2
and system_type_id = X

where X is a value I have to figure out, or you can do yourself...
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 17928434
select ' ALTER TABLE [' + object_name(object_id) + '] ALTER COLUMN [' + column +'] CHAR(3) '
from sys.columns
where max_length = 2
and system_type_id = 175
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LVL 75

Accepted Solution

by:
Aneesh Retnakaran earned 2000 total points
ID: 17928441
SELECT 'ALTER TABLE '+TABLE_NAME +' ALTER COLUMN '+COLUMN_NAME +' CHAR(3)'
FROM INFORMATION_SCHEMA.COLUMNS
WHERE
--TABLE_NAME = 'putTableName'
--AND COLUMN_NAME  = 'puturColumnName' AND
 DATA_TYPE  = 'char'
AND CHARACTER_MAXIMUM_LENGTH = 2

0
 
LVL 28

Expert Comment

by:imran_fast
ID: 17928666
declare @table varchar(128), @stmt varchar(1000)

Declare c cursor for select table_name from information_schema.columns where column_name ='yourcolumn'
open c
fetch next from c into @table
while @@fetch_status = 0
begin
set @stmt = 'alter table ['+@table+'] alter column columnname char(3) null'
exec (@stmt)
fetch next from c into @table
end
close c
deallocate c
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