What are the two types of cursor?
There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors.
How do you define cursor?
A cursor is a pointer to this context area. PL/SQL controls the context area through a cursor. A cursor holds the rows (one or more) returned by a SQL statement. The set of rows the cursor holds is referred to as the active set.
What is trigger and cursor?
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.
What is a firehose cursor?
A forward-only cursor is specified as FORWARD_ONLY and READ_ONLY and does not support scrolling. These are also called firehose cursors and support only fetching the rows serially from the start to the end of the cursor. The rows are not retrieved from the database until they are fetched.
What are the four types of cursor?
Microsoft SQL Server supports the following 4 types of cursors.
- STATIC CURSOR. A static cursor populates the result set during cursor creation and the query result is cached for the lifetime of the cursor.
- FAST_FORWARD. This is the default type of cursor.
- DYNAMIC.
- KEYSET.
What is the use of cursor explain with example?
A cursor is a temporary work area created in the system memory when a SQL statement is executed. A cursor contains information on a select statement and the rows of data accessed by it. This temporary work area is used to store the data retrieved from the database, and manipulate this data.
What is cursor in SQL Server?
A SQL cursor is a database object that retrieves data from result sets one row at a time. The cursor in SQL can be used when the data needs to be updated row by row. A SQL cursor is a database object that is used to retrieve data from a result set one row at a time.
What is index and cursor?
A cursor is basically used to solve complex logic and works on a row by row manner. Index, on the other hand, has the main function of retrieving data from tables much quicker. Indexes are created by users on columns that may be accessed frequently.
What is difference between function and cursor?
A function or procedure is a set of instructions to perform some task. A cursor is an array that can stores the result set of a query. Show activity on this post. Stored procedures are pre-compiled objects and executes as bulk of statements, whereas cursors are used to execute row by row.
What is implicit cursor?
An implicit cursor has attributes that return information about the most recently run SELECT or DML statement that is not associated with a named cursor. Note: You can use cursor attributes only in procedural statements, not in SQL statements.
What is SQL Server cursor?
A SQL Server cursor is a set of T-SQL logic to loop over a predetermined number of rows one at a time. The purpose for the cursor may be to update one row at a time or perform an administrative process such as SQL Server database backups in a sequential manner.
Which of the following is are the types of cursor?
There are the following two types of cursors in SQL: Implicit Cursor. Explicit Cursor.