Oracle

[Oracle]-[sqlplus related]-The serveroutput parameter encountered a problem two days ago. In the 10 GB version, run: select/* + no_index (t1 idx_t1) */* from t1 where n = 3; select * from table (dbms_xplan.display_cursor (null, null, 'advanced ');

Introduction to oracle SQL * PLUS 1: sqlplusSQL * PLUS is an interactive and batch query tool. It is the most basic oracle database utility and uses a basic command line interface, it is usually used by users, administrators, and program developers.

Some special characters in ORACLE are oracle wildcards. The use of the operators for where comparison conditions include: equal to: =, , >=, and <> include: in, not in exists, not exists range:... and, not .... and Matching Test: like, not like Null

Oracle array and case analysis about arrays in ORACLE: three methods can be used to record the same set: 1. Define a TYPE and use VARRAY to obtain an array. However, you can only define the basic TYPE as follows: create type name as varray of

Execute SQL files in batches and output execution logs. 1. Create the betchinsert. bat file. Content: sqlplus username/password @ service name @ BETCH. SQL> SQLINSERT. log exit 2. Create The betah. SQL file. Content: @ nkgis. SQL \ AE _USERS. SQL @

SQL statement for Oracle Application to delete duplicate data query and delete duplicate records 1. Search for redundant duplicate records in the Table. duplicate records are based on a single field (Id) select * from table where Id in (select Id

Oracle Database remote connection configuration steps and FAQs objective computer needs: Open net manager1: In the listener: Change "host" to the computer name (ensure that the name is unique) 2: with the listener, you need to specify the database

[Oracle] variable binding Parent-Child cursor (parent-Child cursor) Parent cursor: as long as the SQL statement text is the same, they correspond to the same parent cursor. Sub-cursor: in some cases, although the SQL statement has the same text,

In oracle, The row_number () over () analysis function row_number () over (partition by col1 order by col2) indicates grouping by col1 and sorting by col2 within the grouping, the value calculated by this function indicates the sequential numbers

Oracle CURSOR program declare cursor EMP_CURSOR is select FIRST_NAME from employees; -- TYPE NAME_ARRAY_TYPE IS varchar (5) OF VARCHAR2 (10); TYPE NAME_ARRAY_TYPE is varray (5) OF VARCHAR2 (10 ); NAME_ARRAY NAME_ARRAY_TYPE; rows int: = 2; V_COUNT

Testing environment for processing the in clause in PreparedStatement: Oracle 10g 1. principle 1 select * from table (split ('a, B, C') Result: 1a2b3c2. conclusion For example: 1 select * from xxx_table where xxx_column in ('xxa', 'xxb', 'xxc ') you

The reason why a common user (users Group) cannot log on to oracle is a strange problem recently. In windows 2003, when the Administrator logs on to the system, if you use pl SQL dev to enter the account and password to log on to oracle, you can log

Oracle concatenates values of different columns into a string [SQL] -- using the concatenation operator "|" or CONCAT, concatenate values of different columns into a string -- Method 1: select s. TEAM | '**' | S. NAME | '**' | S. JOB_NUMBER from

SQL code select SPEC_CODE, item_number, self_item_code, MASTER_FLG, update_date from writable where user_cd = '20170101' and xfimconv (self_item_code) = xfimconv ('a999 ') order by update_date desc; execution result: SQL code SPEC_CODE ITEM_NUMBER

ORACLE sqlldr ctl import data oracle ctl text data export import implementation (Environment oracle 9I 9.0.2) bat part (General Part) cd Y: \ 1 sqlplus mobilenew @ oral/password @ Y: \ 1 \ 6. SQL SQL part (export) set time off echo off head off; set

Oracle error: Instance "orcl", status UNKNOWN, has 1 handler (s) for this service... solution: First, let's talk about the environment: redhat 6.3, oracle11g; it was originally set to enable oracle automatically after startup. Who knows that ps-ef |

Oracle object operation example select * from v $ version; /* BANNER Upgrade Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-64bit Production PL/SQL Release 11.2.0.1.0-Production CORE 11.2.0.1.0 Production TNS for 64-bit Windows: version 11

Some Indexes do not need to be used for identifying unused indexes. However, when you modify a table, the indexes are automatically modified, reducing the database speed. Next we will make a simple experiment to monitor whether the index is used.

Oracle obtains GUID. Oracle does not want MsSqlServer to have the NEWID () method, but we can use the following method to obtain the Guid SQL statement: SELECT sys_guid () from T_Table, the number of guids queried by the SQL statement = the number

Oracle-public-yum configuration use Download and Install Oracle LinuxDownload and copy the appropriate yum configuration file in place, by running the following commands as root: oracle Linux 4, Update 6 or Newer # cd/etc/yum. repos. d # mv