Oracle

Oracle 1. Create an oracle Stored Procedure Create or replace procedure proce_test (paramin in varchar2, paramout out varchar2, paraminout in out varchar2) As Varparam varchar2 (28 ); Begin Varparam: = paramin; Paramout: = varparam | paraminout; End;

Format: View code Declare MSG Varchar2 ( 32 ); P_name Varchar2 ( 32 ); Outresult Varchar2 ( 64 ); Begin P_name: = ' Xxxx ' ; Select Loginname Into MSG From Users Where Loginname = P_name And 1 = 2 ; Dbms_output.put_line

Batch insertion is required in the Project. To prevent duplicate data insertion, you must first determine whether the inserted data already exists. If yes, ignore this insertion; otherwise, insert this data, at the beginning, we first use an SQL

1. Connect to the database C: \ Documents ents and Settings \ Administrator> sqlplus/nolog SQL * Plus: Release 10.1.0.2.0-Production on Saturday May 14 11:14 Copyright (c) 1982,200 4, Oracle. All rights reserved. SQL> Conn/Sysdba Connected.

Common sqlplus commands SQL> Help Index Enter help [Topic]Help. @Copy pause Shutdown @@Define print Spool /Del prompt sqlplus AcceptDescribe quit start AppendDisconnect recover startup Archive logEdit remark store AttributeExecute

I encountered a problem in the group today. I think it's a bit interesting. Let's take a look at it. BelowCodeIf the test passes in MySQL, MSSQL should be able to run without testing. # Create a table as follows Create Temporary

Navicat for XXX is an excellent database management client with MySQL, Oracle, and other versions. We recommend that you use the Enterprise version with comprehensive functions. However, compared with the Free Lite version, the enterprise version

First define a cursor:   Procedure p_myproc ( Pi_param varchar2 ) Is   Vi_a varchar2 (10): = ''; Vi_ B varchar2 (20): = ''; Vi_c varchar2 (30): = '';   -- Definition Cursor mycur is Selece T. A, T. B, t.c From tbl_mytable T;

There are three ways to start the Oracle service:1 slave control panel2 Use MS-DOS commands3. Use Oracle administration assistant for WindowsNT -Start the Oracle service through the control panel1) choose Start> Control Panel> Management Tools>

The following are SQL statements automatically generated by Oracle export backup and import recovery.Source codeEach variable has the following meanings:Exp_back_dir: directory where the DMP file of the Oracle database is exportedScript_file:

1. Oracle startup and Shutdown 1. In a single-host environment To start or shut down the Oracle system, you must first switch to the Oracle user, as shown below: Su-Oracle A. Start the Oracle System Oracle> svrmgrl Svrmgr> connect internal Svrmgr>

  Many parameters are required to optimize the Oracle database. Some of these parameters have a great impact on the system performance. These parameters are variable parameters.Variable parameters can be divided into two categories based on their

Nvl (string1, replace_with) Function: If string1 is null, The nvl function returns the value of replace_with; otherwise, the value of string1 is returned. This nvl serves the same purpose as isnull (string1, replace_with) in sqlserver. Note:

-- Create a scheduling taskDeclareJobno number;BeginDbms_job.submit (jobno, -- timer ID, automatically obtained by the SystemWhat => 'P _ update_t_bs; ', -- p_update_t_bs indicates the name of the stored procedure.Next_date => to_date ('20170101',

Not supported: 24:00:00 formatApril 22 0:00:01 is (a bit depressing) 1. date to character: Select sysdate, to_char (sysdate, 'yyyy-mm-dd hh24: MI: ss') from dual 2. character to date: Select to_date ('2017-03-13 21:15:37 ', 'yyyy-mm-dd hh24:

Optimization rules: 1. In CBO mode, the table is queried from right to left, and the first on the right is the base table.Select a small number of rows as the base table,For three or more tables, You must select a crosstab chart (Table connected

SQL: -- Applicant indicates the table name. Select ' Private ' | Decode (A. data_type, ' Varchar2 ' , ' String ' , ' Number ' , ' Double ' , ' String ' ) | Lower (A. column_name) | ' ;// ' | B. Comments From

Implicit cursor Begin Update try set score = 60 Where course No. = 'c008 'and score If SQL % notfound then Dbms_output.put_line ('there is no score below 60! '); End if; End; / -- Use of cursor Variables Declare Type cursor_type

1. Create a table in PLSQL: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Create   Table Hwqy. Test (carno Varchar2 ( 30 ), Carinfoid Number )     2. Create a stored

It is much more difficult to perform associated updates in Oracle than in SQL Server,Join two table updates, so this is not necessary. It is a bit depressing... Update T_gd_warebase Set Wareqty = ( Select   Sum (B. qtyky) From