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What is the difference between trigger and cursor?
What is the difference between Triggers and Cursors? A trigger is a procedure (code segment) that is executed automatically when some specific events occur in a table/view of a database, while a cursor is a control structure used in databases to go through the database records.
What do you understand by view cursors and triggers?
Triggers and Cursors both are database object.
- Triggers : Triggers are database object and we can perform an action Trigger will fire automatically DML,DDL.
- Cursors: Cursor is an Database object and retrieve the rows from.
- Note : A cursor can be declared and used within a trigger.
What are the two types of cursor?
There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors.
Can we write cursor in trigger?
A cursor can be created within a trigger by writing the declare statement inside the trigger. A trigger cannot be created within a cursor. The main function of the cursor is retrieval of rows from the result set one at a time (row by row).
Which is not type of cursor?
Explanation: SQL Server supports four types of cursor. Explanation: Cursor alternatives are WHILE loop, subqueries, Temporary tables and Table variables. Explanation: We should use cursor in that case when there is no option except cursor. 6.
What is difference between stored procedure and cursor?
A cursor is an array that can stores the result set of a query. Stored procedures are pre-compiled objects and executes as bulk of statements, whereas cursors are used to execute row by row.
What is a trigger and cursor in SQL?
A trigger is a procedure (code segment) that is executed automatically when some specific events occur in a table/view of a database, while a cursor is a control structure used in databases to go through the database records. A cursor can be declared and used within a trigger. In such a situation, the declare statement would be inside the trigger.
How is a cursor used in a database?
A cursor is a control structure used in databases to go through the database records. It is very similar to the iterator provided by many programming languages. In addition to traversing through records in a database, cursors also facilitate data retrieval, adding and deleting records.
Which is better, a while loop or a cursor?
They are helpful in performing the row by row processing and also row wise validation on each row. Better concurrency control can be achieved by using cursors. Cursors are faster than while loops. They use more resources each time and thus may result in network round trip.
What’s the purpose of triggers in a database?
Among its other uses, triggers are mainly used for maintaining integrity in a database. Triggers are also used for enforcing business rules, auditing changes in the database and replicating data. Most common triggers are Data Manipulation Language (DML) triggers that are triggered when data is manipulated.