DB2如何获取当前用户表、字段、索引等详细信息

DB2如何获取当前用户表、字段、索引等详细信息？SQL语句如下所示：

SELECT
d.name tbName,
COALESCE(d.remarks, '') tbDesc,
a.name columnName,
a.coltype columnType ,
decode(a.nulls,'Y','1','0') notNull,
decode(a.identity,'Y','1','0') auto,
a.longlength width,
a.scale precision,
COALESCE(a.remarks, '') comment,
decode(n.unique_colcount,'1','1','0') unique,
decode(n.uniquerule,'P','1','0') masterKey,
COALESCE(n.name, '') indexName
FROM
sysibm.syscolumns a
INNER JOIN sysibm.systables d on a.tbname=d.name
LEFT JOIN sysibm.sysindexes n on n.tbname=d.name and SUBSTR(colnames,2)=a.name
where
d.type='T'and d.tbspace='USERSPACE1'