oracle中用comment on命令给表或字段加以说明，语法如下：COMMENT ON { TABLE [ schema. ] { table | view } | COLUMN [ schema. ] { table. | view. | materialized_view. } column | OPE
常用数据库 JDBC URL 格式Microsoft SQL ServerMicrosoft SQL Server JDBC Driver （一般用来连接 SQLServer 2000）驱动程序包名：msbase.jar mssqlserver.jar msutil.jar驱动程序类名: com.microsoft.jdbc.sqlserver.SQLServerDriverJDBC URL: j
1.查看表空间使用情况：select sum(bytes)/(1024*1024) as free_space,tablespace_name from dba_free_space group by tablespace_name;SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE, &nb
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