While updating records using cursor
This has the benefit of doing most of the work in SQL and only updating based on the rowid, a unique address in the table.
It declares a type, which you place the data within in bulk, 10,000 rows at a time. However, as I say this will not be as efficient as Name ; type t__data is table of c_data%rowtype index by binary_integer; t_data t__data; begin open c_data; loop fetch c_data bulk collect into t_data limit 10000; exit when t_data.count = 0; for idx in t_data.first ..
DECLARE Employee_Cursor CURSOR FOR SELECT Employee ID, Title FROM Adventure Works2012. Employee WHERE Job Title = 'Marketing Specialist'; OPEN Employee_Cursor; FETCH NEXT FROM Employee_Cursor; WHILE @@FETCH_STATUS = 0 BEGIN FETCH NEXT FROM Employee_Cursor; END; CLOSE Employee_Cursor; DEALLOCATE Employee_Cursor; GO selects into a long list of variables, then we have a large duplicated statement which is both ugly and of course, "non-DRY" code.
I'm not aware of a post-condition control-of-flow T-SQL statement so it seems I'd have to resort to a Simply said you can't... You need to get the first line before the loop and then do it again in the while statement.
= Name WHEN NOT MATCHED THEN INSERT (ID, Name) VALUES (Id, Name) To actually answer your question I would do it something like as follows.So it is necessary to have both the fetch statement to loop-through the complete recordset.create or replace procedure student Load is v_id ID%type; v_name Name%type; v_sn stud Name%type; cursor cur_load is select * from student; begin open cur_load; loop fetch cur_load into v_id,v_name; exit when cur_load%notfound; select stud Name into v_sn from stud Load where stud ID = v_id; if(v_sn!All telephone numbers in the Phone column in the Customers table are stored as char(12) strings of the following format, ‘999-999-9999’. = 500 OPEN Phone Cursor FETCH NEXT FROM Phone Cursor WHILE @@FETCH_STATUS = 0 BEGIN UPDATE Customers SET Phone = ‘222’ SUBSTRING(Phone,5,8) WHERE CURRENT OF Phone Cursor FETCH NEXT FROM Phone Cursor END CLOSE Phone Cursor DEALLOCATE Phone Cursor The big update will hold a transaction against the database for, potentially, a long time... For this, I would recommend a cursor to spread that load out over a period of time. something like this: The cursor would be far slower in any large dataset, talk about hours vice seconds or milliseconds.i must make the appropriate changes to the Customers table as quickly as possible using the least administrative effort. What it will do is not lock up the database from other users for as long at any one time.