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Table info

Author

Topic

dstalker
Starting Member

2 Posts

Posted - 2005-08-23 : 10:09:04

I want to create a select statement that will return to me useful information for a table. This info would include table name, column name, column type, column length, Max string length in column. The SQL statement I have so far errors on the Max string length.

select o.name as TableName,
c.name as ColName,
u.name as ColType,
c.length as ColLen,
(select max(LEN(LTRIM(RTRIM(c.name)))) from o.name) as maxlen

from sysobjects o inner join syscolumns c
on o.id = c.id
inner join systypes u
on c.xtype = u.xtype
where o.name='TableName'
group by o.name, c.name,u.name,c.length,c.colorder
order by c.colorder

Thanks. Dwayne

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2005-08-23 : 10:23:42

select * from information_schema.columns
where table_name='tt' order by ordinal_position

Madhivanan

Failing to plan is Planning to fail

dstalker
Starting Member

2 Posts

Posted - 2005-08-23 : 11:10:59

Thanks for the response.
Maybe I should have said 'longest' instead of MAX. I want to change some column data types from Char(500) to Varchar(?), and I do not want to truncate any useful data, so I am curious if I can get all this in one SQL statement. This table does not seem to give me the actual string length i.e. (LTRIM(RTRIM(c.name)) Thanks.

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2005-08-24 : 00:59:37

If you want to change from Char to varchar use the same column width

This will show you the maximum lengths of each column

select column_name,Data_type,Character_maximum_length from information_schema.columns
where table_name='tableName' order by ordinal_position

To know the maximum characters in the table

select name,length from syscolumns where id=object_id('tableName')
order by colid

Madhivanan

Failing to plan is Planning to fail

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