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05-Mar-2020 12:57

Constraint behavior depends on constraint state, as explained in .

Constraints are easier to write and less error-prone than triggers that enforce the same rules.

However, triggers can enforce some complex business rules that constraints cannot.

From the java end, It is possible to select the record by id and then update that record, but that would make 2 database calls.

DML triggers execute when a user tries to modify data through a data manipulation language (DML) event.Gutzait has been involved in IT for 20 years as a developer, business analyst and database consultant.For the past 10 years, she has worked exclusively with SQL Server.Intro | Part 1 | Part 2 | Part 3 | Part 4 | Part 5 | Part 6 | Part 7 Problem: You already have a trigger on the table. You wonder if performance will improve if you add functionality to the existing trigger or maybe the best option is to create another trigger. In this expert-led tutorial, senior DBA and technical trainer Basit Farooq provides a step-by-step guide for using the SQL Server Import and Export Wizard to transfer data between SQL Server databases and Microsoft Excel worksheets.-- Create 3 tables with the same schema: create table Table_1 (Col_1 int identity (1,1) PRIMARY KEY, Col_2 varchar(10) NOT NULL, Col_3 datetime NOT NULL default getdate()) go select convert(int, Col_1) as Col_1, -- I use the convert to eliminate the Identity property.

DML triggers execute when a user tries to modify data through a data manipulation language (DML) event.Gutzait has been involved in IT for 20 years as a developer, business analyst and database consultant.For the past 10 years, she has worked exclusively with SQL Server.Intro | Part 1 | Part 2 | Part 3 | Part 4 | Part 5 | Part 6 | Part 7 Problem: You already have a trigger on the table. You wonder if performance will improve if you add functionality to the existing trigger or maybe the best option is to create another trigger. In this expert-led tutorial, senior DBA and technical trainer Basit Farooq provides a step-by-step guide for using the SQL Server Import and Export Wizard to transfer data between SQL Server databases and Microsoft Excel worksheets.-- Create 3 tables with the same schema: create table Table_1 (Col_1 int identity (1,1) PRIMARY KEY, Col_2 varchar(10) NOT NULL, Col_3 datetime NOT NULL default getdate()) go select convert(int, Col_1) as Col_1, -- I use the convert to eliminate the Identity property.By default, a trigger is created in the enabled state. When a trigger fires, tables that the trigger references might be undergoing changes made by SQL statements in other users' transactions.