How to check if a column exists in SQL Server table -

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i need add specific column if not exist. have this, returns false:

if exists(select *             information_schema.columns            table_name = 'mytablename'                  , column_name = 'mycolumnname')

how can check if column exists in table of sql server database?

sql server 2005 onwards:

if exists(select 1 sys.columns            name = n'columnname'           , object_id = object_id(n'schemaname.tablename')) begin     -- column exists end

martin smith's version shorter:

if col_length('schemaname.tablename', 'columnname') not null begin     -- column exists end

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