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. On the off chance that the iteration count is extremely high, at t...
Again, it really depends on your situation. I almost always use a cursor to loop through records...
Cursor vs. WHILE Loop I also wanted to compare running a cursor to running a WHILE loop that continually SELECTs the next value to be processed. I writethis codequite a bit to avoid writing cursors and I was curious if it was really helping out. My test in this case was to SELECT al...
SQL Copy CREATE OR REPLACE PROCEDURE p_close_refcursor ( emp_refcur OUT SYS_REFCURSOR ) AS test_cursor SYS_REFCURSOR; departmentno dept.deptno%TYPE; BEGIN OPEN test_cursor FOR SELECT deptno FROM dept; LOOP FETCH test_cursor INTO departmentno; EXIT WHEN test_cursor%NOTFOUND; DBMS_OUTPUT....
loop. To convert a cursor to while loop, first you have to find the total number of rows in the table. Then you have to iterate through the table rows using WHILE control-of-flow element till the total row count is reached. Here is how the above example is converted to while loop: ...
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# MDEV-10581 sql_mode=ORACLE: Explicit cursor FOR LOOP # CREATE PROCEDURE p1 AS CURSOR cur0 IS SELECT 10 AS a, 'b0' AS b; CURSOR cur1 IS SELECT 10 AS a, 'b0' AS b; CURSOR cur2 IS SELECT 10 AS a, 'b0' AS b; BEGIN FOR rec1 IN cur1 LOOP SELECT rec1.a, rec1.b; rec...
Maybe. If I were teaching a class on T-SQL/MS SQL Server I would give any solution to a homework assignment an F (0) if it used a cursor. I wouldn't even cover it in class or test on it. It the students wanted to learn how to write a cursor, they can learn it on their ow...
http://stackoverflow.com/questions/17050959/while-loop-inside-a-trigger-to-loop-through-all-the-columns-of-table-in-sql http://www.experts-exchange.com/Database/MS-SQL-Server/SQL_Server_2008/Q_28394432.html http://stackoverflow.com/questions/7258748/after-insert-trigger-looping ...