SqlServer，Oracle，db2，MySql查询表索引

SqlServer
1. 查询表索引
SELECT 
     索引名称=a.name 
     ,表名=c.name 
     ,索引字段名=d.name 
     ,索引字段位置=d.colid
     ,c.status
  FROM sysindexes a 
     JOIN sysindexkeys b ON a.id=b.id AND a.indid=b.indid 
     JOIN sysobjects c ON b.id=c.id 
     JOIN syscolumns d ON b.id=d.id AND b.colid=d.colid 
WHERE a.indid NOT IN(0,255) 
     and c.xtype='U' --and c.status>0 --查所有用户表 
     AND c.name='message' --查指定表 
ORDER BY c.name,a.name,d.name;

　　

SqlServer
2. 查询没有索引的表

select * from sysobjects where xtype='U'
   and name not in (
   SELECT c.name 
   FROM sysindexes a 
   JOIN sysindexkeys b ON a.id=b.id AND a.indid=b.indid 
   JOIN sysobjects c ON b.id=c.id 
   JOIN syscolumns d ON b.id=d.id AND b.colid=d.colid 
   WHERE a.indid NOT IN(0,255) 
	and c.xtype='U' --and c.status>0 --查所有用户表 
	--AND c.name='message' --查指定表 
)
order by name

Oracle

select user_ind_columns.index_name,user_ind_columns.column_name,
user_ind_columns.column_position,user_indexes.uniqueness
from user_ind_columns,user_indexes
where user_ind_columns.index_name = user_indexes.index_name
and user_ind_columns.table_name = ‘你想要查询的表名字’;

db2

SELECT 
     SUBSTR(SI.INDSCHEMA, 1, 30) AS INDSCHEMA, 
     SUBSTR(SI.INDNAME, 1, 30) AS INDNAME, 
     MGI.INDEX_SCANS, 
     MGI.INDEX_ONLY_SCANS 
FROM 
    TABLE(MON_GET_INDEX('EPRICER', 'CTMTTRN', -2)) as MGI, 
    SYSCAT.INDEXES AS SI 
WHERE 
    MGI.TABSCHEMA = SI.TABSCHEMA 
    AND MGI.TABNAME = SI.TABNAME 
    AND MGI.IID = SI.IID 
ORDER BY 
    MGI.INDEX_SCANS DESC; 

MySql

SHOW index FROM 'tblname';