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Programmers cannot control the implicit cursors and the information in it.
Whenever a DML statement (INSERT, UPDATE and DELETE) is issued, an implicit cursor is associated with this statement.
The cursor can only reference one row at a time, but can move to other rows of the result set as needed.-1 because the inefficiency reason is false since some 7.x version and the vulnerability to data errors is a good thing in my opinion.If you expect one row, but you get two, it is very desirable that you are warned by the TOO_MANY_ROWS exception. CURSOR: When PLSQL issues sql statements it creates private work area to parse & execute the sql statement is called cursor. IMPLICIT: When any PL/SQLexecutable block issues sql statement.You can name a cursor so that it could be referred to in a program to fetch and process the rows returned by the SQL statement, one at a time.There are two types of cursors − Implicit cursors are automatically created by Oracle whenever an SQL statement is executed, when there is no explicit cursor for the statement.
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In computer science, a database cursor is a control structure that enables traversal over the records in a database.