what are the different types of triggers in sql server?
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SQL Server provides us with two main types of triggers: the DML Triggers and the DDL triggers. The DDL triggers will be fired in response to different Data Definition Language (DDL) events, such as executing CREATE, ALTER, DROP, GRANT, DENY, and REVOKE T-SQL statements.
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['Scalar Functions (Returns A Single Value)', 'Inline Table Valued Functions (Contains a single TSQL statement and returns a Table Set)', 'Multi-Statement Table Valued Functions (Contains multiple TSQL statements and returns Table Set)']
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["IF OBJECT_ID('dbo.Table1', 'U') IS NOT NULL.", 'DROP TABLE dbo.Table1.', 'GO.', 'CREATE TABLE dbo.Table1 (ColumnID INT PRIMARY KEY)', 'GO.', "EXEC sys.sp_helptext 'dbo.Table1'", "SELECT OBJECT_DEFINITION(OBJECT_ID('dbo.Table1', 'U'))"]
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['INSERT INTO SELECT requires that data types in source and target tables match.', 'The existing records in the target table are unaffected.']
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['You can use one or more tables separated by a comma to include various conditions using a WHERE clause, but the WHERE clause is an optional part of the SELECT command.', 'You can specify any condition using the WHERE clause.', 'You can specify more than one condition using the AND or the OR operators.']
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Validation rules are used to confirm that the data entered into a record meet various data quality / business rules before letting the user save it. Triggers can be used for various different things and can be executed at different times - e.g. when initiating a new record, before saving it, when a record is deleted.
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Row-level triggers execute once for each row in a transaction. ... Statement-level triggers execute once for each transaction. For example, if a single transaction inserted 500 rows into the Customer table, then a statement-level trigger on that table would only be executed once.
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Stored procedures can be invoked explicitly by the user. It's like a java program , it can take some input as a parameter then can do some processing and can return values. On the other hand, trigger is a stored procedure that runs automatically when various events happen (eg update, insert, delete).
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Find the trigger that is causing the problem and disable it or drop it to resolve the issue. Usually, this error occurs in the Oracle database by the system level triggers on DDL or SYSTEM events. Another example of error ORA-00604 is when the user attempts to run a newly-created table using SELECT* from cdc.
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There is no before-undelete event in Salesforce Triggers because, an Update or Insert can have a Before functionality as the record exists. Whereas there is no Record before deleting the Actual record. Hence only after deleting, we can have the Undelete event, whereas every record merely exists before deleting.
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['SQL Injection: The insertion of SQL meta-characters in your user login or input is referred to as SQL injection. ... ', 'Buffer Overflows: This type of weakness is rare in web applications such as ASP, PHP, Perl or even shopping cart. ... ', 'Remote Command Execution: ... ', 'Background: ... ', 'Price Manipulation: ... ', 'Cross-site Scripting: ... ', 'Conclusion:']
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SQL Server Database Replication: Replication Types Supported by SQL Server. Through embedded SQL database replication technology, SQL Server supports three types of replication: snapshot, transactional, and merge replication.
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When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events. To define an alert, you specify: The name of the alert.
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Difference between trigger and batch in salesforce. Batch Apex runs whenever it is specifically called (or scheduled to run). trigger not queued for run, which cause immediat action. Batch queued to run, which may cause delays in starting.
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['DML (DATA MANIPULATION LANGUAGE)', 'DDL (DATA DEFINITION LANGUAGE)', 'DCL (DATA CONTROL LANGUAGE)', 'TCL (TRANSACTION CONTROL LANGUAGE)']
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To create a trigger, we need to change the delimiter. Inserting the row into Table1 activates the trigger and inserts the records into Table2. To insert record in Table1. To check if the records are inserted in both tables or not.
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Before triggers execute before the data has been committed into the database. ... After triggers execute after the data has been inserted or updated in the database. Usually after triggers are used because you need access to a formula field or the Id in the case of an insert.