Creating cursors in sql and updating each line in cursor

A cursor is a temporary work area created in the system memory when a SQL statement is executed.A cursor contains information on a select statement and the rows of data accessed by it.The set of rows the cursor holds is called the set.There are two types of cursors in PL/SQL: These are created by default when DML statements like, INSERT, UPDATE, and DELETE statements are executed.END block, duplicating the code for the handler and the loop control, or you can reset your loop control variable inside the inner loop once the cursor is exhausted.I won't post an example here, as this would soon clutter the page., if the cursor's query plan is simple enough that no extra overhead is needed to support it.However, application developers are advised not to rely on using backward fetches from a cursor that has not been created with cursors may give unexpected results if they invoke any volatile functions (see Section 36.6).

is specified and the transaction that created the cursor successfully commits, the cursor can continue to be accessed by subsequent transactions in the same session.If there is any type mismatch, variable assignments and comparisons may not work the way you expect.To be safe, instead of hard coding the type of a variable, you should use the This program has no effect when run, because there are no changes to the database.The problem was that the functions were issuing SELECT statements which sometimes returned empty resultsets.This in turn executed the declared HANDLER, which interrupted the function(!

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