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
--查询现有所有数据库表的索引情况 Select indexs.Tab_Name As [表名],indexs.Index_Name As [索引名] ,indexs.[Co_Names] As [索引列], Ind_Attribute.is_primary_key As [是否主键],Ind_Attribute.is_unique As [是否唯一键], Ind_Attribute.is_disabled As [是否禁用] From ( Select Tab_Name,Index_Name,
MySql行转列 以id分组,把name字段的值打印在一行,逗号分隔(默认) select CustomerDrugCode,group_concat(AuditItemName) from noaudit_drug group by CustomerDrugCode; 以id分组,把name字段的值打印在一行,分号分隔 select CustomerDrugCode,group_concat(AuditItemName separator ';') from noaudit_drug grou
转:https://www.cnblogs.com/pacer/archive/2010/03/02/1676371.html [sqlserver]: sqlserver 认为 null 最小. 升序排列:null 值默认排在最前. 要想排后面,则:order by case when col is null then 1 else 0 end ,col 降序排列:null 值默认排在最后. 要想排在前面,则:order by case when col is null then 0 el
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"."
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