triggers in pl sql

1. First talk about the difference between pl/SQL and SQL * plus. For example, it is easy to understand: Pl/SQL-> C ++ LanguageSQL * plus-> Microsoft Visual C ++ 6.0 Compiler Pl/SQL is

[SQL] -- triggers, SQL triggersConcept Trigger is a method provided by SQL server to programmers and data analysts to ensure data integrity. It is a special stored procedure related to table events, its execution is not called by a program, nor is it manually started, but triggered by an event. For example, when a tabl

PLSQLPL/SQL developer is an Oracle Database DeveloperProgramIntegrated Unit Development Environment (IDE). With PL/SQL developer, you can easily create the server part of your client/server application. So far, you can do the following in the worst case:• Use a text editor to Write Program units (processes, triggers, a

from a procedure block in that it must return data with the following structure: FUNCTION name RETURN datatypeIsBEGIN--statementsRETURN value;[EXCEPTION]END;650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/45/42/wKioL1PlOFuAw5AzAAEQSpSY9TY394.jpg "title=" 4.png " alt= "Wkiol1plofuaw5azaaeqspsy9ty394.jpg"/> vii. PL/SQL The program buildPL/SQL programs

or the PL/SQL program block: PROCEDURE name [(Parameter[,parameter,...])] Is [Local declarations] BEGIN Execute statements [EXCEPTION Exception handlers] End [name] Package (Package) A package is actually a collection of related objects that are grouped together, and when any function or stored procedure in a package is invoked, the package is loaded into memory, and the access speed of any functi

This paper mainly deals with the application examples of DDL triggers and login triggers. MicrosoftSQL Server provides two primary mechanisms for enforcing business rules and data integrity: constraints and triggers. Triggers are special types of stored procedures that can take effect automatically when a language eve

Tags: col program configuration SQL query field positioning Rod AC MVCThese days encountered two problems, are very wonderful, distressed for three days, the final positioning out.Problem one, inserting data through PL/SQL developer to a remote Oracle database server, querying data through PL/

1) classification of Sets Oracle supports three types of collections: Associative array (Index-by table) Nested table) Variable-length array (VARRAY) One of their differences is that the Nested table and VARRY can be used either in PL/SQL or directly in the database, but the Associative array doesn't work, that is, associative array cannot be created separately using the create type statement. It can only b

In fact, this is also a problem at work. To tell the truth, I am not willing to do it myself. I also want to write statements for queries, but I have not thoroughly studied this kind of information,Write SQL statements in JavaProgramAt the same time, I chose to be lazy. First, if it is golden, of course there is no need to say that the Direct Write statement is similar to select. If it is PL/

Using PL/SQL profiler to locate PL/SQL bottleneck code for SQL optimization, you can use SQL tuning advisor to achieve automatic SQL optimization and adjustment. For

For SQL optimization, you can use SQL tuning advisor to achieve automatic SQL optimization and adjustment. For PL/SQL code, there are both SQL code and PL/

Working with Dates in PL/SQL (date used in PL/SQL) The previous articles in this introductory PL/SQL series focused on working with strings and numbers in PL/

v_job= ' salesman ' then UPDATE scott.emp SET sal=sal* (1+c_salesman) WHERE empno=empno1; elsif v_job= ' MANAGER ' then UPDATE scott.emp SET sal=sal* (1+c_manager) WHERE empno=empno1; elsif v_job= ' SR.CONT ' then UPDATE scott.emp SET sal=sal* (1+c_sr_cont) WHERE empno=empno1; END IF; --Displays completion information dbms_output. Put_Line (' already for employees ' | | empno1| | ' A successful raise! '); EXCEPTION-handling of PL/

package consists of two parts: the specification and the package body, the specification describes variables, constants, cursors, and subroutines, and the package body fully defines subroutines and cursors.Triggers (trigger)Triggers are associated with a table or database event, and triggers that are defined on the table are triggered when a trigger event occurs. [NextPage] Variables and constants Varia

Working with Numbers in PL/SQL (use numbers in PL/SQL) This article gives you all the information you need in order to begin working with Numbers in your PL/SQL programs. numbers in PL/

PL-SQL package creation and application, pl-SQL CreationZookeeper Creating and applying PL-SQL packages ① IntroductionA package is a combination of PL/

PL/SQL program control structure and change data and manage transactions in PL/SQL, plsql1. condition Control A. IF condition branch Syntax: If (condition 1) then Statement; Elsif (condition 2) then Statement; Elsif (Condition 3) then Statement; Else Statement; End if; B. case condition branch: equivalent comparison, c

................................................................................................ END LOOP; D. Nesting loops and Labels: defining labels: 3. Sequential controlA.goto statement: Used to jump to a specified The disadvantage is that it increases the complexity of the program and reduces readability, so Oracle does not recommend using it for the day. B. NULL statement: Empty statement, do not have any actual effect, usually occupy position with 4. Exception Handling A. There are two

This article gives you all the information you need in order to begin working with numbers in your PL/SQL programs.Numbers in PL/SQL PL/SQL offers a variety of numeric datatypes to suit different purposes: Number. A true decimal

PL/SQL language development Reference Manual II: PL/SQL program structure PL/SQL language development Reference Manual1,PL/SQL Block1) Decla