Today I was looking for a field in a SQL Server 2000 database which had lots of tables. I knew the name of the field, but I didn't know the table name. So I modified the code contained in master.dbo.sp_columns to find it. It turns out that in my case, I was looking for a field that didn't exist. Hopefully you'll have better luck.
To use this, replace the words your field here in the next-to-last line.
SELECT
TABLE_QUALIFIER = convert(sysname,DB_NAME()),
TABLE_OWNER = convert(sysname,USER_NAME(o.uid)),
TABLE_NAME = convert(sysname,o.name),
COLUMN_NAME = convert(sysname,c.name),
d.DATA_TYPE,
convert (sysname,case
when t.xusertype > 255 then t.name
else d.TYPE_NAME collate database_default
end) TYPE_NAME,
convert(int,case
when d.DATA_TYPE in (6,7) then d.data_precision /* FLOAT/REAL */
else OdbcPrec(c.xtype,c.length,c.xprec)
end) "PRECISION",
convert(int,case
when type_name(d.ss_dtype) IN ('numeric','decimal') then /* decimal/numeric types */
OdbcPrec(c.xtype,c.length,c.xprec)+2
else
isnull(d.length, c.length)
end) LENGTH,
SCALE = convert(smallint, OdbcScale(c.xtype,c.xscale)),
d.RADIX,
NULLABLE = convert(smallint, ColumnProperty (c.id, c.name, 'AllowsNull')),
REMARKS = convert(varchar(254),null), /* Remarks are NULL */
COLUMN_DEF = text,
d.SQL_DATA_TYPE,
d.SQL_DATETIME_SUB,
CHAR_OCTET_LENGTH = isnull(d.length, c.length)+d.charbin,
ORDINAL_POSITION = convert(int,
(
select count(*)
from syscolumns sc
where sc.id = c.id
AND sc.number = c.number
AND sc.colid <= c.colid
)),
IS_NULLABLE = convert(varchar(254),
substring('NO YES',(ColumnProperty (c.id, c.name, 'AllowsNull')*3)+1,3)),
SS_DATA_TYPE = c.type
FROM
sysobjects o,
master.dbo.spt_datatype_info d,
systypes t,
syscolumns c
LEFT OUTER JOIN syscomments m on c.cdefault = m.id
AND m.colid = 1
WHERE
-- o.id = @table_id
c.id = o.id
AND t.xtype = d.ss_dtype
AND c.length = isnull(d.fixlen, c.length)
AND (o.type not in ('P', 'FN', 'TF', 'IF') OR (o.type in ('TF', 'IF') and c.number = 0))
AND isnull(d.AUTO_INCREMENT,0) = isnull(ColumnProperty (c.id, c.name, 'IsIdentity'),0)
AND c.xusertype = t.xusertype
AND c.name like '%your field here%'
