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what is purpose of cursor in sql

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answered on January 8, 2021 Popularity 9/10 Helpfulness 3/10

answer what is purpose of cursor in sql

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what is purpose of cursor in sql

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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.

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Tags: sql

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Contributed on Jan 08 2021

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what is cursor in sql server with example

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/*
Declare – Declares the cursor with a name and the select statement which populates the result set
Open – Opens a cursor and populates the cursor by executing the select statement which is specified while declaring a cursor
Fetch – To retrieve a specific row from the cursor based on the fetch arguments like NEXT, FIRST, LAST, etc
Close – Closes the current result set of SQL Server cursor and can be reopened
Deallocate – Removes cursor reference and releases all the resources associated with a cursor
*/

ECLARE @TempTable AS TABLE (Id INT, [Name] VARCHAR(200));

INSERT INTO @TempTable
VALUES (1,'Test Name1'),
(2,'Test Name2'),
(3,'Test Name2')

DECLARE 
    @Id INT, 
    @Name VARCHAR(200);

DECLARE cursor_personInfo CURSOR
FOR SELECT 
        Id, 
        [Name]
    FROM 
       @TempTable;

OPEN cursor_personInfo;

FETCH NEXT FROM cursor_personInfo INTO 
    @Id, 
    @Name;

WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT CONVERT(VARCHAR(10),@Id) +' '+ @Name;

        FETCH NEXT FROM cursor_personInfo INTO 
            @Id, 
            @Name;
    END;

CLOSE cursor_personInfo;

DEALLOCATE cursor_personInfo;

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Source: www.sqlservertutorial.net

Tags: cursor cu

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Contributed on Jun 16 2022

Rasel Ahmed

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attributes of cursor in sql

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/*
Declare – Declares the cursor with a name and the select statement which populates the result set
Open – Opens a cursor and populates the cursor by executing the select statement which is specified while declaring a cursor
Fetch – To retrieve a specific row from the cursor based on the fetch arguments like NEXT, FIRST, LAST, etc
Close – Closes the current result set of SQL Server cursor and can be reopened
Deallocate – Removes cursor reference and releases all the resources associated with a cursor
*/

DECLARE @TempTable AS TABLE (Id INT, [Name] VARCHAR(200));

INSERT INTO @TempTable
VALUES (1,'Test Name1'),
(2,'Test Name2'),
(3,'Test Name2')

DECLARE 
    @Id INT, 
    @Name VARCHAR(200);

DECLARE cursor_personInfo CURSOR
FOR SELECT 
        Id, 
        [Name]
    FROM 
       @TempTable;

OPEN cursor_personInfo;

FETCH NEXT FROM cursor_personInfo INTO 
    @Id, 
    @Name;

WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT CONVERT(VARCHAR(10),@Id) +' '+ @Name;

        FETCH NEXT FROM cursor_personInfo INTO 
            @Id, 
            @Name;
    END;

CLOSE cursor_personInfo;

DEALLOCATE cursor_personInfo;

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Source: Grepper

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Contributed on Jun 23 2022

Rasel Ahmed

0 Answers Avg Quality 2/10

cursor is sql

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-1

-- Declare the cursor
DECLARE my_cursor CURSOR FOR
    SELECT name, email
    FROM customers;

-- Open the cursor
OPEN my_cursor;

-- Fetch the first row from the cursor
FETCH NEXT FROM my_cursor;

-- Loop through all rows in the result set
WHILE @@FETCH_STATUS = 0
BEGIN
    -- Print the values of the columns in the current row
    PRINT 'Name: ' + name + ', Email: ' + email;

    -- Fetch the next row
    FETCH NEXT FROM my_cursor;
END

-- Close and deallocate the cursor
CLOSE my_cursor;
DEALLOCATE my_cursor;

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Source: chat.openai.com

Tags: cursor cu

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Contributed on Dec 08 2022

ekkamrit

0 Answers Avg Quality 2/10

what is purpose of cursor in sql

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