问如何在informix数据库中搜索列

EN

SELECT tabname, colno, colname  
FROM systables a, syscolumns b 
WHERE a.tabid = b.tabid 
and colname = "cust_nbr"
ORDER BY colno; 

SELECT a.tabname, constrname, d.tabname 
  FROM systables a, sysconstraints b, sysreferences c, 
       systables d 
 WHERE b.constrtype = 'R' 
   AND a.tabid = b.tabid 
   AND b.constrid = c.constrid 
   AND c.ptabid = d.tabid 
   AND a.tabname = ?;