Oracle

1 Create or Replace functionGet_request_codereturn varchar2 as2 3 --function: Automatic generation of order numbers4V_mca_no Mcode_apply_01.mca_no%TYPE;5 6 CURSORGet_max_mca_no is 7 SELECT Max(Substr (Mca_no, One,1))--

In the first contact with C # when the company is using Oracle database, then C # How to connect Oracle database is the first to grasp the knowledge point. There was no odp.net at the time, but Visual Studio integrated the call to the Oralce

In general, the Oracle database language can be divided into the following 5 major categories:1.DML Data manipulation language (data mannipulation Language): Querying, manipulating datasheet rows SELECT: Retrieving database table or view

First, the phenomenon of database deadlockDuring the execution of the program, click OK or save button, the program is not responding, there is no error.Second, the principle of deadlockWhen you perform an update or delete operation on a column of a

Differences in grammar1, Oracle does not have offet,limit keyword , so in Oracle to be paged, to be replaced by rownum.2, when the Oracle builds the table, does not have the auto_increment, all wants to let the table's primary key increment, wants

1. Perform a table rebuild command ALTER TABLE table_name MOVE (verify that it is not a row, does not lower the watermark, but can release the tablespace)When you create an object such as a table, whether or not you insert the data, it takes up some

Partition Characteristics:1.Partition Key;2.Partitioning StrategiesPartitioning Strategies:1. Range2. List3. HashCreate an instance of a table with multiple partitions:CREATE TABLE testpt (tid int)Partition by Range (TID)(partition TESTPT_B10 values

The basis of a multi-table query is the use of a Cartesian set:Final number of rows = number of rows in table 1 * Number of rows in table 2Final number of columns = number of columns in table 1 + Number of columns in table 2The key to filter the

Rman Target/log=/orasoft/backup/${date}backup1.log Run {Allocate channel C1 device type disk;Allocate channel C2 device type disk;Allocate channel C3 device type disk;Backup database format '/orasoft/backup/db_%t%u.bak ';Backup current controlfile

2.1 Network Configuration Tool NET ManagerOracle is a database system in a networked environment, and its own net manager configures and sets up the network environment. Net Manager as a tool for managing the network environment by configuring and

Three types of collection operations are available in Oracle: and (UNION), intersection (INTERSECT), poor (minus) · UNION: Combines the results of multiple queries into a single query result, with no duplicate content · UNION All: Also

In Oracle, users can be established and authorized to operate. To create the user's syntax: CREATE USER by password;Example: Create a test user with a password of test123CREATE USER by test123;If you want to create a user, you should

1. To enable Python to operate the Oracle database, you first need to install the Cx_oracle package, which can be obtained from the address below[Plain]View PlainCopy http://cx-oracle.sourceforge.net/ 2. Additional Oracle class

The data are as follows:Name IDZhang SanRequired implementations:Name IDZhang 31Zhang 32Zhang 33--Create a temporary tableCreate TableTmp as(Select 'Zhang San'Name' the'Id fromdual);--notation 1SelectName,regexp_substr (ID,'[^,]+',1, Level) asID

Log on to the operating system where the Oracle database server is installed.Windows: Use cmd directly to enter the command line. Linux, log in to the database server using SSH first.View Environment Variables Settings for

Database index processing is a bit of a problem, simply recordOracle rules that objects under the same schema cannot be named with the same name, typically creating index names with "table name _ Field name", so that you can quickly know which table

Extracurricular problemsRequirement: Delete a user while preserving the user's data? How to SolveAlter user Scott account lock; unlock unlock if you need to use it another dayLock a user to log on with SYSDBA or to view dataSELECT * from

First, about Oracle's profilesThe profiles file is a configuration collection of password and resource restrictions, including CPU time, I/O usage, idle time, connection time, number of concurrent sessions, password policy, and so on resource usage

There are more than one way to connect a database remotely. The main writing here is how to remotely connect to a database using the Plsql Visualizer without Oracle installed locally.First, the premiseFirst you have to install the Plsql tool locally.

Logical storage of the database, starting from the table spaceThe logical storage structure for a database object is as followsTable Space-Segment-zone-BlockSELECT * from Dba_tablespaces;SELECT * FROM Dba_segmentswhere tablespace_name= ' Kyc_veh