ID=1 and (Select top 1 name from(Select top [N] id,name from sysobjects where xtype=char(85)) T order by id desc)1[T] = 表名

内存调整select * from v$sga;调整前SGANAME VALUE Fixed Size 452184Variable Size 402653184

在大的数据库应用中，经常因为各种原因遇到重复的记录，造成数据的冗余和维护上的不便。1。用rowid方法据据oracle带的rowid属性，进行判断，是否存在重复,语句如下：查数据: select

1，选取所有表空间select tablespace_name from dba_tablespaces;2,对于每一个表空间建立数据文件的列表select file_name from

按月份统计当月记录数select pid,DATE_FORMAT(adddate,''%Y%c''),count(*) as abc from T_TONE_LOG group by pid

查询表结构select substr(table_name,1,20) tabname,substr(column_name,1,20)column_name,rtrim

二、查看当前用户每个表占用空间的大小：Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group

Declare @RowCount intSelect @rc=0Select @RowCount=0begin//create temp table ,save sp_who informationcreate table #tspid( spid int null, ecid

(COL1,COL2) IN(SELECT COL1,COL2 FROM T GROUP BY COL1,COL2 HAVING COUNT(*) 1)ANDROWID NOT IN(SELECT MIN(ROWID) FROM T GROUP BY COL1,C

Oracle允许对B*Tree索引进行转储，以显示B*Tree的层次结构。示例如下:1.首先选择要研究的索引SQL select index_name from