data dictionary tables in oracle

Because the MySQL database has been used, today just a whim, thinking and Java are the same boss out of Oracle himself will not, say go will not be a bit embarrassing, so began to turn data, watching video to get up, step by step, think about what to write, start from the creation of the table, OK, It's not a lot to talk about. Create a table:User table:CREATE TABLE User (ID Number (5,0) NOT null primary ke

Oracle uses a cursor to delete all record scripts in all user data tables Application Scenario: because the data in the Oracle database involves confidential information, we hope to delete all the data at a time and only keep the

During this time, a configuration library needs to be imported to different people. After each person is imported to the database, all the tables in the Database need to be cleared. If you want to import tables one by one, it is very troublesome, therefore, the following PLSQ During this time, a configuration library needs to be imported to different people. After each person is imported to the database, a

(constraints) are used to prevent invalid data from being entered into a table. You can use constraints to do the following: Force the data in the table to follow the rules when inserting, updating, or deleting rows from a table; For successful operations, the constraints must be met, if there is a dependency between tables, to prevent the deletion of

Label:Oracle takes the intersection of data from two tablesKeyword: Oracle takes the intersection of data from two tables INTERSECTOracle, as a large relational database, often needs to extract the intersection data of two tables

The partition Interaction Technology of Oracle Partitioned Tables enables rapid data transfer. This requires that records from a business table before a certain time point be transferred to its historical table. If the current business table is not set based on the partition table at this business time point, you can only perform insert and delete operations. Thi

Create the following users by using the selected tool: User name PhpuserPassword PHPUSERPWSystem Permissions CREATE TABLE The code is as follows Copy Code CREATE VIEWCREATE SEQUENCECREATE TRIGGER Role (Oracle Database 10.x) CONNECT The code is as follows Copy Code RESOURCE The following is a set of sample SQL commands for creating the user. These co

ADD constraint Pk_cid primary key (CID); To create a stus table:CREATE TABLE Stus (Stuid Number (8),--Study No.Stuname varchar2 (20),--NameStusex char (2),--genderStuage Number (8),--ageStudate date,--Admission timeCID Number (8)); Add a PRIMARY KEY constraint for StuidALTER TABLE Stus ADD constraint Pk_stuid primary key (STUID); Add a non-null constraint for StunameALTER TABLE Stus Modify (stuname not NULL); Add a default value for StusexALTER TABLE Stus Modify (stusex dafault ' female '); To

keywords: Oracle takes the intersection of data in two tables INTERSECT Oracle as a large relational database, often need to extract the intersection data of two tables in daily application For example, if you need to find an empl

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In oracle, the delete command starts with delete, which is the same as other SQL statements. The following describes how to delete tables, views, sequences, functions, and data in oracle. After executing the following SQL statement, we can get the SQL statement to be executed, and then copy the SQL statement printed by

When you create a table, you must specify the data type for each column of the table. If the actual data does not match the data type of the column, the database rejects the save. Specify the date of birth for the student as "1980-13-31".In Oracle, the common data types are:

You may be running an Oracle 10g Release 2 database server, but supporting some applications may have been written very early. Data tables created prior to Oracle 8i typically have a long data type to store large text. With the introduction of the large Object (LOB)

You may be running an Oracle 10g Release 2 database server, but supporting some applications may have been written very early. Data tables created prior to Oracle 8i typically have a long data type to store large text. With the introduction of the large Object (LOB)

oracle| Data Oracle relational database management system is a popular relational database in the world, it is an extremely powerful, flexible and complex system, it is said that in the use of Oracle should be the idea, that is in the SQL can almost achieve any idea. The following is a method of using SQL to search fo

Use log mining to restore accidentally deleted tables, data, and views from incomplete Oracle recovery /*-------------------------- Prerequisites: 1. DB works in archive mode; 2. Prepare cold data files; ---------------------------*/ Col scriptForA80 Col SQL _REDOForA80 -- Concatenate the statement where t

1345 4 12345John 1345 5 45778John 1345 6 34566John 1345 7 23456Rows selected.-Note: The cast multiset syntax is used here, and Column_value is a column in table (odcinumberlist)--3) Writing Insert SQLSql> CREATE TABLE EMP2 (empno number primary key,3 ename VARCHAR2 (10),4 Sal Number5);Table created.Sql> CREATE TABLE Emp_contact2 (empno number references emp,3 Phone_no Number4);Table created.\sql> Insert AllWhen (i = 1) then into EMP (empno,ename,sal) VALUES (empno,ename,sal)When (i > 0) then in

backup of the data is to cover the operation of creating a backup of the data table, after which the backup is a new action, which is different from the 2 type of operator! So you need to differentiate! SQL statement: (here we need to query the view, get the view to back up the data of the user's object, and then go to the user under the User query table!) ） 1,

There is a new feature in 11G. When the table has no data, no segment is allocated to save space. Solution: 1. insert a row and then roll back to generate a segment. This method inserts data into an empty table and then deletes it, resulting in a segment. An empty table can be exported. 2. Set the deferred_segment_creation parameter. Show parameter deferred_segment_creation NAME TYPE VALUE------------------

Label:In the process, especially the tasks performed daily, usually to check that the query's data table exists, if it does not exist and wait for a period of time to execute, the following code implements this function, if the table does not exist, throw an exception, give exception handling code, ensure data integrity How to use: p_checktable (' username.tablename ') user name does not exist, then find in