Frequent question: How many types of cursor are there in SQL Server?

SQL Server supports four cursor types.

What are the types of cursors in SQL?

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 cursor and its types in SQL Server?

Cursor is a Temporary Memory or Temporary Work Station. It is Allocated by Database Server at the Time of Performing DML operations on Table by User. Cursors are used to store Database Tables. There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors.

What are cursors in SQL Server?

Cursor is a database object to retrieve data from a result set one row at a time, instead of the T-SQL commands that operate on all the rows in the result set at one time. We use a cursor when we need to update records in a database table in singleton fashion means row by row.

What is the default cursor type in SQL Server?

When neither FORWARD_ONLY nor SCROLL is specified, FORWARD_ONLY is the default, unless the keywords STATIC, KEYSET, or DYNAMIC are specified. STATIC, KEYSET, and DYNAMIC cursors default to SCROLL. Unlike database APIs such as ODBC and ADO, FORWARD_ONLY is supported with STATIC, KEYSET, and DYNAMIC Transact-SQL cursors.

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What is cursor example?

In this chapter, we will discuss the cursors in PL/SQL. Oracle creates a memory area, known as the context area, for processing an SQL statement, which contains all the information needed for processing the statement; for example, the number of rows processed, etc. A cursor is a pointer to this context area.

What is cursor life cycle?

SQL Cursor Life Cycle

A cursor is opened for storing data retrieved from the result set. Fetching Cursor. When a cursor is opened, rows can be fetched from the cursor one by one or in a block to do data manipulation. Closing Cursor. The cursor should be closed explicitly after data manipulation.

What are the main features of cursor?

The major function of a cursor is to retrieve data, one row at a time, from a result set, unlike the SQL commands which operate on all the rows in the result set at one time. Cursors are used when the user needs to update records in a singleton fashion or in a row by row manner, in a database table.

What is a cursor data type?

There are two main types of cursor data types: weakly-typed cursor data types and strongly-typed cursor data types. … Cursor data type result set definitions can be defined by providing a row type definition. Only result sets that match the definition can be assigned to and stored in a strongly typed cursor data type.

What is use of cursor in SQL?

Cursors enable manipulation of whole result sets at once. In this scenario, a cursor enables the sequential processing of rows in a result set. In SQL procedures, a cursor makes it possible to define a result set (a set of data rows) and perform complex logic on a row by row basis.

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What is difference between trigger and cursor?

The main function of the cursor is retrieval of rows from the result set one at a time (row by row). … A cursor is activated and thus created in response to any SQL statement. A trigger is executed in response to a DDL statement, DML statement or any database operation.

Which is faster cursor or while loop?

While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.

Are SQL cursors bad?

SQL Cursors are fine as long as you use the correct options: INSENSITIVE will make a temporary copy of your result set (saving you from having to do this yourself for your pseudo-cursor). READ_ONLY will make sure no locks are held on the underlying result set.

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