Oracle

When you add a foreing key constraint, you can also specify the type of cascade operation, which is used primarily to determine how to handle a foreign key field in a child table when deleting a record in the (on delete) schedule, with the following

exists the first tuple from the outer query, and then the related property values in the inner query, the inner query is processed, and if the inner where clause is true, the tuple of the outer layer is placed into the result set.In first executes

When deleting the data table often encountered foreign key constraints cannot be deleted, we can delete the database table through the following steps, it is recommended to delete the library before the database backup, develop good habits. 1.

There is a need: statistics on the sales of superior departments, manufacturing data are as follows:drop TABLE Dept;CREATE TABLE Dept(DEPTNO number,Deptname VARCHAR2 (50),Parent_deptno number);INSERT INTO Dept values (1, ' Market Department

Oracle's package packages can have a lot of storage, which can be called directly in Java via the package's total gateway.Java calls Oracle's package codepublic boolean cal () Java.lang.Exception {CallableStatement cstmt = null; String procedure = "

SELECTUPPER(F.tablespace_name) Tablespace name, D.TOT_GROOTTE_MB table space Size (M), D.TOT_GROOTTE_MB-F.total_bytes "used Space (M)", To_char (ROUND ((D.TOT_GROOTTE_MB-F.total_bytes)/D.TOT_GROOTTE_MB*100,2),‘990.99‘"Use ratio", f.total_bytes "free

--First step, backup data--Step Two, delete the userCascade--Step three, create the userCreateUserIstaudit identifiedBy""Default Tablespace Istaudit--Default table SpaceTemporaryTablespace Istaudit_temp ProfileDEFAULT;--Grant/revoke role Privileges

Synonyms for OracleSynonyms are an alias for schema objects such as tables, indexes, and views. As with views, synonyms do not occupy any real storage space, only the description of their definitions in Oracle's data dictionary. When you use

I didn't understand when this business started.I thought it was a structure, or a package or a procedure,Later I think I want to understand the point, in fact, this business is just a thing I want to complete, this thing I do not finish, otherwise

There are two ETL business machines deployed PowerCenter in the production environment, and the recent discovery cannot connect to the ETL service through the client.The initial suspicion is that the powercenter is dead or the database has

[What is an index]In a relational database, an index is a data structure associated with a table that makes it faster to execute a query's SQL statement. In fact, the index is like a book directory, we can quickly find the content according to the

After oracle11g, the user can create a temporary tablespace group that can contain one or more temporary table spaces in a temporary table space group.A temporary table space group must consist of at least one temporary tablespace and no explicit

Subtotal for Oracle and subtotal for oracle1. What is Sequence 1.1? Sequence is an object provided by oracle for generating auto-increment primary keys. This is similar to the identity of SQL server. From a mathematical point of view, it is an

Oracle deletes log filesOracle deletes log filesThe syntax for deleting a log file is as follows:Alter database drop logfile member logfile_name;Note the following when deleting a log file:1. The log file group of the log file cannot be in the

[Lone sword] Oracle knowledge point sorting (1) Table space, users, and oracle knowledge pointsLink navigation for this series: [Lone sword] Oracle knowledge point sorting (1) Table space and users [Gu JIU Jian] Oracle knowledge point sorting (2)

[Dan JIU Jian] Oracle knowledge point sorting (2) database connection and oracle knowledge pointLink navigation for this series: [Lone sword] Oracle knowledge point sorting (1) Table space and users [Gu JIU Jian] Oracle knowledge point sorting (2)

How to import dmp database files in oracleImporting and exporting Oracle Data imp/exp is equivalent to restoring and backing up oracle data. The exp command can export data from the remote database server to the local dmp file, and the imp command

Oracle Instant Client InstantClient for convenient use of PLSQLDeveloper Method Background: Oracle-32bit clients are not installed in 64-bit operating systems for ease of use of PLSQL Developer (64bit Oracle clients not supported)1. Download the

Oracle inversion Function Oracle provides a reverse inversion function, reverse, but this function cannot be used for grouping inversion. This article provides a function that can be used for grouping inversion, as shown below: Create or replace

RMAN-06023: no backup or copy of datafile 1 found to restore, rman-06023datafile RMAN-06023: no backup or copy of datafile x found to restore encountered during ORACLE 10g Database restoration, as shown below ........................................