1.这段linq,执行期间报ora-12704:character set mismatch错误. var query = from m in ctx.MENU where (m.SUPER_MENU_ID ?? "") == (parentMenuId ?? "") orderby m.SORT_ID descending select new { m.SORT_ID }; 生成出来的sql如下: SELECT "Project1"."…
1. 查询oracle中所有用户信息select * from dba_users;2. 只查询用户和密码select username,password from dba_users;3. 查询当前用户信息select * from dba_ustats;4. 查询用户可以访问的视图文本select * from dba_varrays;5. 查询数据库中所有视图的文本select * from dba_views;select distinct tablespace_name from SY…
dictionary 全部数据字典表的名称和解释,它有一个同义词dict,dict_column 全部数据字典表里字段名称和解释 如果我们想查询跟索引有关的数据字典时,可以用下面这条SQL语句: select * from dictionary where instr(comments,'index')>0;如果我们想知道user_indexes表各字段名称的详细含义,可以用下面这条SQL语句: select column_name,comments from dict_columns wher…
1.表结构 create table t_student( id ) primary key, name ), birthday date ); increment ; insert into t_student values(seq_t_student.nextval,'张三',sysdate); insert into t_student values(seq_t_student.nextval,'李四',to_date('1990-01-01 13:13:13','yyyy-mm-dd h…
How do you check the Oracle database character set? SQL> select value from nls_database_parameters where parameter='NLS_CHARACTERSET'; VALUE -------------------------------------------------------------------------------- UTF8 tnsping错误 TNS-03505: Fa…
"空闲比例" totalspace,sum(t.blocks) totalblocks from dba_data_files t group by t.tablespace_name) dbf, ( freespace,sum(tt.blocks) freeblocks from dba_free_space tt group by tt.tablespace_name) dfs where trim(dbf.tablespace_name) = trim(dfs.tablespac…
一个需求,做个监控脚本,监控一个表,把数据拉出了,处理一下,组成一个新的脚本,并执行. 直接上脚本: #!/bin/bash VALUE=`sqlplus "scott/trigger@orcl" << ! set heading off set feedback off set pagesize set verify off set echo off select id,name,code,sex,age from t_people; exit !` for i in $…
java.sql.SQLException: 无法转换为内部表示 Query: SELECT * FROM nontheasttycoon Parameters: [] at org.apache.commons.dbutils.AbstractQueryRunner.rethrow(AbstractQueryRunner.java:392) ~[commons-dbutils-1.6.jar:1.6] at org.apache.commons.dbutils.QueryRunn…
SELECT object_name, machine, s.sid, s.serial# FROM gv$locked_object l, dba_objects o, gv$session s WHERE l.object_id = o.object_id AND l.session_id = s.sid;…
1.查询SCOTT表中有多少表,并显示表的一些描述select * from all_tables WHERE owner='SCOTT' ; 2.查询oracle数据库版本select * from v$version; select version from v$instance; select version FROM Product_component_version;…
转至:https://www.cnblogs.com/zhangshuaihui/p/11451590.html 1. 查询数据库用户何时过期 登陆数据库PL/SQL工具,输入以下sql语句: select username,expiry_date from dba_users where username in ('TFDS','SYSTEM'); 由以上sql查询得到system用户到2019/7/12过期,tfds用户到2020/1/31过期. 2. 查询oracle数据库的密码过…