Oracle

Oracle modifies the field type with data to char due to changes in requirements. The general idea is as follows: www.2cto.com will change the type of field name to backup, then add a field with the same name as the field name to change the type (the

Oracle10g Change Database Character Set 1. software environment 1) oracle 10g 2. Problem description: Chinese Characters in Oracle Database are garbled, so Chinese characters are displayed '? Symbol 3. Cause Analysis the Oracle character set has an

Ibatis calls the function in Oracle to make the assumption that the student's student ID and name can be uniquely identified. Create or replace function get_stu_birth (vid varchar, vname varchar) return date is vbirth date; www.2cto.com n number;

1 Definition: hierarchical query uses tree traversal to traverse data sets containing tree structures to obtain the parent-child relationship of tree hierarchy reports. You can control the following: ① The direction of the traversal tree is from top

Oracle rollback table record operation 1. create table mgt_data_dict_temp as select * from mgt_data_dict_ele where rownum

Oracle recursive statement Start with... Connect By clause recursive query is generally used for a table to maintain a tree structure. CREATE example TABLE: create table TBL_TEST (id number, NAME VARCHAR2 (100 BYTE), pid number default 0);

Analysis of ORACLE time function (SYSDATE) 1: Obtain the SQL statement of the week of the current month> select to_char (sysdate, 'yyyymmdd W HH24: MI: ss') from dual; TO_CHAR (SYSDATE, 'yy ----------------- 20030327 4 18: 16: 09SQL> select to_char (

Related links:Summary of oracle simple learning (1) -- SQLHttp://www.bkjia.com/database/201210/159545.html1. create table userInfor (id int not null primary key, name varchar (50) NULL, birthday dateNOTNULL, ageint not null, sex int not null ); ii.

Oracle simple learning Summary (5) -- Data Operations (add, delete, modify, and delete) Link: oracle simple learning Summary (1) -- sqlhttp: // www.bkjia.com/database/210210/159545.html#oraclesimple learning Summary (2) -- Query Summary (3) --

Oracle 10g RAC dual-node time not synchronized under AIX solution 1. A dual-node RAC of a customer is received, and the two nodes are not synchronized at two nodes. Ii. problem diagnosis 1. Check service status: Command crs_stat-t 2. Check time: the

Using PLSQL Developer to connect to a remote ORACLE database using PLSQL Developer to connect to a remote ORACLE database is roughly divided into two steps. First, create a new database in oracle Enterprise Manager (OEM), that is, click "add

CREATE a data link in Oracle 1. To establish a Database link, you must have the PCREATE Database link system permission. to connect to a remote account, you must have the common permission to CREATE session;2. Ensure that the connected user has the

Import the SQL file to the method in PowerDesigner (convert the oracle SQL file to mysql) and run xxxxxx. the procedure for importing the database structure of the SQL file to powerdesigner is as follows: Step 1: export the table structure (no table

Two error analyses occurred when a 10g database was created in 11gRAC. In the clusterware and asm environments of 11g R2, we will run a 10g rdbms environment for the purpose of upgrading or migrating data.When using a 10 Gb rdbms to create a

SQL code create table TEST_EMPLOYEES (ID NUMBER, NAME NVARCHAR2 (50), SALARY NUMBER); insert into TEST_EMPLOYEES (ID, NAME, SALARY) values (1, 'zhang san', 8000); insert into TEST_EMPLOYEES (ID, NAME, SALARY) values (2, 'Li si', 7000); insert into

The Tempotary table is used to save the intermediate result set during a transaction or session. The data saved in the temporary table is only visible to the current session, and data of other sessions is invisible to all sessions. Even if the

Oracle string types: Oracle has four basic string types: CHAR, VARCHAR2, NCHAR, and NVARCHAR2. In Oracle, all strings are stored in the same format. The most comprehensive range of database blocks is 1 ~ The 3-byte length field is followed by the

In Oracle PL/SQL, writing a Stored Procedure for null operations, although we write a Stored Procedure (Stored Procedure) to complete some specific functions. However, in some cases, the functions implemented by the existing storage functions may no

PLS-00103-Problems with running alter table during stored procedures the following error occurs when running alter table during stored procedures: www.2cto.com Compilation errors for PROCEDURE. UNDOMERCHANTACCOUNT Error: PLS-00103: Encountered the

Check which tables or views are available in Oracle. 1. query which tables of the current user have the SQL code SELECT * FROM user_tables www.2cto.com. 2. query the current user, which tables can be accessed [that is, access to yourself and other