why do we need cursor in sql

sql cursor example

DECLARE @name VARCHAR(50) -- database name 
DECLARE @path VARCHAR(256) -- path for backup files 
DECLARE @fileName VARCHAR(256) -- filename for backup 
DECLARE @fileDate VARCHAR(20) -- used for file name 

SET @path = 'C:Backup' 

SELECT @fileDate = CONVERT(VARCHAR(20),GETDATE(),112) 

DECLARE db_cursor CURSOR FOR 
SELECT name 
FROM MASTER.dbo.sysdatabases 
WHERE name NOT IN ('master','model','msdb','tempdb') 

OPEN db_cursor  
FETCH NEXT FROM db_cursor INTO @name  

WHILE @@FETCH_STATUS = 0  
BEGIN  
      SET @fileName = @path + @name + '_' + @fileDate + '.BAK' 
      BACKUP DATABASE @name TO DISK = @fileName 

      FETCH NEXT FROM db_cursor INTO @name 
END 

CLOSE db_cursor  
DEALLOCATE db_cursor

Posted by: Guest on February-10-2020

Source

DECLARE @product_name VARCHAR(MAX), @list_price DECIMAL; DECLARE cursor_product CURSOR FOR SELECT product_name, list_price FROM production.products; OPEN cursor_product; FETCH NEXT FROM cursor_product INTO @product_name, @list_price; WHILE @@FETCH_STATUS = 0 BEGIN PRINT @product_name + CAST(@list_price AS varchar); FETCH NEXT FROM cursor_product INTO @product_name, @list_price; END; CLOSE cursor_product; DEALLOCATE cursor_product; Code language: SQL (Structured Query Language) (sql)

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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