Oracle

I. what is the model statementThe model statement is a new feature of oracle10g,The model clause in SQL is an important new feature that Oracle 10g database introduces to the Enterprise intelligence domain. This clause is of great help to

Declare v_out varchar2 (a); begin Execute ' Select P_guid from C_itcomp ' into v_out; Dbms_output.put_line (v_out); End;Database version must be > =oracle 8iThe direct SELECT statement is useless, guess because select returns

This article was reproduced from: http://www.iteye.com/topic/371390Oracle's temporal tables play a big role in the application system, which allows users to manipulate their own data without interfering with each other, without worrying about

SelectDbf.tablespace_name,dbf.totalspace "Total (M)", Dbf.totalblocks asTotal blocks, dfs.freespace "Total remaining (M)", dfs.freeblocks "number of remaining blocks", (dfs.freespace/Dbf.totalspace)* -"Idle scale" from(SelectT.tablespace_name,sum(t.

In a page is often the phenomenon of paging, then the background database should be how to page display it?Paging can use the RowNum function in Oracle.The display of data from the first line to the first row of a page.Below is a description of the

Recently did not know the project Oracle database configuration, a Web project after re-import, run always prompt username/password:login denied, the account password is invalid, cannot successfully connect to the Oracle database, Check the

Create or Replaceprocedure Update_recordcode is the cursor Location_data is a SELECT * from location where remark in (' 952701 ', ' 9527008 ', ' 952705 ');--Affirming the cursor servicecode number:=1; Begin for L in Location_data loop

On Oracle 11g, you can partition on a virtual column, and this feature is useful, and here's a test:Sql> select * from V$version;BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise

Access Photo tableSELECT * from [email protected] where a1= ' 11111 ';Error: ora-22992 Unable to use LOB locator selected from remote tableChange to the following method:Method One:DROP TABLE TempCreate Table Temp AS SELECT * from [email protected]

Select c.*,round ((datanow-databefore)/databefore,2) *100| | ' % ' Datapercent from (select A.auth_tztype, A.datanow,b.databefore from(select Auth_tztype,count (auth_tztype) Datanow from T_author where auth_applydate between To_date (' 2011/1/1 ', '

The merge in Oracle 10g has some of the following improvements: 1. Update or INSERT clauses are optional 2. Update and INSERT clauses can be added to the WHERE clause 3. The on condition uses the constant filter predicate to insert all rows into the

Although the ORM mapping is used in the project, the optimization of the Oracle system is valuable, which summarizes the commonly used statements from the perspective of SQL statements.1. Optimizations in the From field:Oracle Yasuteru Load table

1. Fault descriptionI'm free today. An Oracle test server is installed on Linux, and the installation is complete when you log in using SYSDBA you encounter problems[Email protected] ~]$ Sqlplus/as SYSDBASql*plus:release 11.2.0.1.0 Production on Fri

Mybatis batch inserts a large number of oracle data records. Performance Problem Solving Environment: mybatis + oracle11g r2 1. Use "direct path insertion" ("/* + append_values */" in the following SQL statement), and use the keyword "union all ":

DBA_Oracle Audit basic concepts (concepts) (Database Audit and fine-grained monitoring addition, deletion, and modification), dba_oracleaudit 2014-08-15 BaoXinjian 1. What is audit? (1). Simply put, it is to record database operations. Whether or

SQL statement used to copy a row of any table in Oracle (test OK) I tested it for a long time. There are many methods on the Internet, but they are all incorrect. The correct method is as follows: Declare cursor rowAll is select * from tb_news

Oracle implements mysql update updatelimit Oracle seems to be lagging behind and inconvenient to use. The Toad software is stupid and slow, and pl/SQL is even more. The interface style in 1990s is slow. Oracle does not support limit. By default7 #

Oracle Database views and permissions Three users, test1, test2, and test3, have DBA privileges. Use the TEST1 user to create a table T1 and grant its query permission to TEST2: SQL> create table t1 as select * from all_objects; The table has been

Index misunderstanding in oracle Learning We all know that indexes can increase the speed to eliminate sorting, but they are often abused in actual use, which not only wastes resources, but also plays a negative role. This error is often invisible

Oracle substitution variable When querying or updating data, users enter data by themselves and use & tag in ORACLE, such Select ename, job, sal, hiredate from emp where sal> & inputjob an input prompt box appears when you run SQL Developer, in this