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    Automatic Increment of your Numeric primary key is one of the most frequent tasks of these types of triggers.Again as the name suggests these are the type of triggers which are created over DDL statements such as CREATE or ALTER and get fired either before or after execution of your DDL statements.Triggers are named PL/SQL blocks which are stored in the database or we can also say that they are specialized stored programs which execute implicitly when a triggering event occurs [Click Here To Tweet This] which means we cannot call and execute them directly instead they only get triggered by events in the database.These events can be anything such as As the name suggests these are the triggers which depend on DML statements such as Update, Insert or Delete and they get fired either before or after them.L'avantage principal du dclencheur rside dans le fait que le code est centralis dans la base de donnes, et se dclenchera quel que soit l'outil utilis pour mettre jour ces donnes, donnant ainsi l'assurance qu'une utilisation d'un ordre DML depuis Sql*Plus, Forms ou n'importe quelle application tierce procurera un rsultat identique sur les donnes l'inconvnient principal du dclencheur rside dans le fait que son excution utilise des ressources qui peuvent augmenter sensiblement les temps de traitement, notamment lors de modifications massives apportes sur une table Les ordres SQL (SELECT, INSERT, UPDATE, DELETE) contenus dans le bloc PL/SQL et qui se rfrent la table sur laquelle s'excute le dclencheur peuvent gnrer l'exception ORA-04091 TABLE IS MUTATING (pour une explication dtaille du problme des tables en mutation, rfrez-vous l'article Rsolution du problme de la table mutante (ora-04091) par Pomalaix Le bloc PL/SQL qui constitue le trigger peut tre excut avant ou aprs la vrification des contraintes d'intgrit Il peut tre excut pour chaque ligne affecte par l'ordre DML ou bien une seule fois pour la commande Seules les colonnes de la ligne en cours de modification sont accessibles par l'intermdiaire de 2 variables de type enregistrement OLD et NEWOLD reprsente la valeur avant modification OLD n'est renseigne que pour les ordres DELETE et UPDATE.Elle n'a aucune signification pour un ordre INSERT, puisqu'aucune ancienne valeur n'existe NEW reprsente la nouvelle valeur NEW n'est renseigne que pour les ordres INSERT et UPDATE.In addition, the OPENROWSET command can also support SELECT statements where a table is joined to the Excel spreadsheet.Let's work through some examples with the SQL Server 2005 Adventure Works sample database for each operation with a sample Excel spreadsheet.

    With the previous tutorial we finished the series of Iterative statements or looping statements in Oracle PL/SQL so now it’s time to move on to a little more advance topic in PL/SQL.

    We assure that you will not find any problem in this PL/SQL tutorial.

    But if there is any mistake, please post the problem in contact form.

    I have seen your previous tips (Export data from SQL Server to Excel and Different Options for Importing Data into SQL Server) related to working with Excel and SQL Server data.

    The main command used in one of the tips is OPENROWSET.

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