sp_columns [tablename]
SHOW COLUMNS FROM table_name
DESCRIBE table_name; /* List all columns of a database's table*/
select schema_name(tab.schema_id) as schema_name,
tab.name as table_name,
col.column_id,
col.name as column_name,
t.name as data_type,
col.max_length,
col.precision
from sys.tables as tab
inner join sys.columns as col
on tab.object_id = col.object_id
left join sys.types as t
on col.user_type_id = t.user_type_id
order by schema_name,
table_name,
column_id;