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Sql server cursor update#
Please refer to Static Cursors, INSERT Statement, DELETE Statement, and UPDATE Statement operations.1) Explain What is a cursor in SQL Server?ġ) Create a Temporary table for students.Ģ) Insert some dummy records into the created table for demonstrations.ģ) Generate/Update student enrollment number based on the branch, year, and student roll no using the cursor.Ī Cursor is a SQL Server database object that is used to manipulate data in a result set on a row-by-row basis.
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Within the Loop, we used one more IF Statement to check whether Occupation is equal to Management or Education = Partial High School IF = N'Management' OR = N'Partial High School'Īnd if the condition is TRUE, the dynamic cursor will use the DELETE statement to delete that record. We haven’t changed anything in this SQL Server Dynamic Cursor example, except few lines of code, and those lines are: IF = N'Management' OR = N'Partial High School'
Sql server cursor how to#
In this example, we will show you how to perform the Delete operations within the dynamic cursor. SELECT įrom the below screenshot, you can see that the cursor has updated the Income and Sales Amount Dynamic Cursor in SQL Server for DELETE Please use the following SQL Query to check whether the Cursor has updated the records in the Employee table or not. INTO we used the CLOSE, and DEALLOCATE statements to close, and deallocate the cursor. Otherwise, it will throw an error.Īnd then, we used the FETCH NEXT to get the next record from the cursor. TIP: If your table (here it is Employee table) has the Primary Key, then only you can use the WHERE CURRENT OF statement. Within the Loop, we used one more IF Statement to check whether Occupation is equal to management or not IF = N'Management'Īnd if the condition is TRUE, the cursor will use the UPDATE statement to update the yearly Income and Sales Amount. INTO we used the WHILE LOOP to loop over the cursor elements, and within the loop, FETCH_STATUS is used to check the status of the FETCH statement. The below statement will fetch the next record from dynamic_employee_cursor into already declared variables. Next, we used the within the IF Statement to check whether there are any rows in the Cursor or not IF > 0 Then, we declared, and open the SQL Server dynamic cursor called dynamic_employee_cursor for all the records in Employee table Next, we declared a few variables to hold the data coming from the Cursor. Within that Dynamic cursor, we will use the WHILE LOOP to loop over the SQL Server cursor elements and perform updates SET NOCOUNT ONĭECLARE DECIMAL (10, DECIMAL (10, 2) įirst, we used SET NOCOUNT ON to stop the number of rows affected message from SQL Query. And how to perform the Update operation within the SQL dynamic cursor.įor this, we are using the DECLARE CURSOR Statement. In this example, we will show you how to declare and open a dynamic cursor in SQL Server. For this dynamic cursor demonstration, we are going to use the Employee table that holds 14 records Dynamic Cursor in SQL Server For UPDATE Let us see how to Create a Dynamic Cursor in SQL Server, and how to perform both Updates, and delete operations within the dynamic cursor with an example.
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Unlike static cursors, all the changes made in the Dynamic cursor will reflect the Original data. The SQL Dynamic Cursors are exactly opposite to Static Cursors. You can use this SQL Server Dynamic cursor to perform INSERT, DELETE, and UPDATE operations.