query to list all tables in oracle database

. SQL> show user User is "bys" SQL> select 'size _ tabelspace' NAME, sum (user_bytes)/1024/1024 SIZE_M from dba_data_files where tablespace_name = 'users' UNION ALL select 'size _ object' NAME, sum (nvl (bytes, 0)/1024/1024 SIZE_M from user_segments where tablespace_name = 'users '; NAME SIZE_M ------------------------- SIZE_TABELSPACE 5.25 SIZE_OBJECT 4 3. query the data file size and file name Col file

Tags: base mysql5.7 databaseTown Yard text:The Confucian School of the practical and practical, line Buddhism Purdue sentient beings, the monastic Kangsheng fidelity, understanding of the easy to change the image. To science and technology to shine a good law, the achievement of a conscience blog.______________________________________________________________________________________________________Operating System:ubuntukylin 16.04 LTS 64bitMysql:ver 14.14 Distrib 5.7.17, for Linux (x86_64) using

/** * Deletes the name of the field passed in to all tables in the current database, and the record of the corresponding tagged value * MR_CHENPH (2012-1-12) * Invocation Way Select Deletetag (' Isdel ', 1) from Dual * to The above statement deletes records in all tables wh

Select table_name from User_tables; Tables owned by the current user select table_name from all_tables;//Table of all users select table_name from Dba_tables;//Includes system table Select table_name FR Om dba_tables where owner= ' user name ' user_tables:table_name,tablespace_name,last_analyzed, etc. dba_tables:ower,table_name, Tablespace_name,last_analyzed et all_tables:ower,table_name,tablespace_na

1. Create User User1Create user User1 identified by xxxxDefault Tablespace xxxx_tableTemporary Tablespace TempProfile defaultGrant connect to User1;2, Way one: Batch table to empowerSelect ' Grant select on Pposuat_17. ' | | table_name | | ' to TESTUSER_17, ' from Dba_tables where owner= ' pposuat_17 ';Mode two, sys empoweringIf you want to make read-only settings for all tables, you can grant the Select an

, therefore, is also called an inline view. When you use a query in the FROM clause, you must specify an alias for the subquery. 3, paging query1) Top N: First N records. Select Top 5 * from emp ORDER by HireDate Displays information from 5th to 9th persons (by Sal High and low) Select Top 5 from EMP where empno not in (select Top 4 empno from emp ORDER BY Sal Desc) Order by Sal Desc Identity: Indicates that th

Tags: des style blog io color ar os sp forafter the database design is complete, it is often necessary to keep a desc description of all tables in the database in a wiki or other document, in particular the meaning and purpose of each field. It is not advisable to manually generate the nature. Therefore, I have written

Basic query of Oracle tables Oracle Paging 1. rownum Paging Select * from emp; Select a1. *, rownum rn from (Select * from emp) a1; 2. Display rownum (allocated by oracle) Select a1. *, rownum rn from (Select * from emp) a1 where rownum Select * from (Select a1. *, r

Differences between two oracle query tables oracle query two table differences such as table 1 create table T1 (MAC VARCHAR2 (150), PURCHASENAME VARCHAR2 (200), PRODUCTID VARCHAR2 (200 )) table 2 create table T2 (MACADDR VARCHAR2 (20), PRODUCTID VARCHAR2 (20) records in tabl

Oracle learning 2 (data type and Table query) oracle Data Type: www.2cto.com character type: the maximum char size is 2000 characters, and the space defined by char will be occupied no matter how much content, char queries are very efficient and fast. Fixed Length. char should be used for the fields to be queried, which is extremely fast. Varchar2 is longer and c

experience is also out O (∩_∩) o haha ~ Two. Add the index again after the high concurrency test: The database index SQL statement is as follows: Here I have a question, last week I added index for half an hour I did not add the index I stopped, this afternoon only took 551 seconds to add up the index ... I don't understand. Clean down the project code and run again (try to remove the cache as often as possible, otherwise the results will vary): Ha

Label: DeclareType ref_cur_variable isREFcursor; Cur_variable ref_cur_variable; V_empno Scott.emp.empno%type; V_ename Scott.emp.ename%type; V_sqlvarchar2( -) := 'Select T.empno, t.ename from Scott.emp t'; begin OpenCur_variable forV_sql; LoopFetchcur_variable intoV_empno, V_ename; Exit whenCur_variable%NotFound; Dbms_output.put_line (cur_variable%RowCount || ' -' ||V_empno|| ' ' ||v_ename); EndLoop; Closecur_variable; End;

Php generates a tree-like list of query results from the database. Php: how to generate a tree list from the database query results. query result tree this article describes how php gen

employees 40, while adding a non-departmental employee to the EMP table.INSERT into EMP (EMPNO,ENAME,DEPTNO) VALUES (8989, ' HELLO ', null);The EMP table is currently as follows: Hello this employee has no departmentObservation one: The inner connection realizes the effectSELECT E.empno, E.ename, D.deptno, D.dnameFrom EMP E, Dept DWHERE E.deptno = D.deptno;At this time, no department employees and no employees of the department information is not present, because null judgment is not satisfied.

Label: Application: Field name of all data tables contained in the query database for all data in a table with a known field nameHow to: Specify the field name, User database table, which can execute the following queryThe--

, the interface shows the table space name, table space type, district management type, to "trillion" as the unit of the size of the table space, the size of the table space used and table space utilization. Fig. 1 Table space size and utilization rate 2, view the Oracle database table Space Information command method: By querying the data dictionary table in the datab