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Parameter and Keyword Description:
SQL:
This SQL is the name of the implicit SQL cursor.
%FOUND:
This attribute results TRUE if an INSERT, DELETE, or UPDATE statement affected one or more rows or a SELECT INTO statement returned one or more rows. Or else, it results FALSE.
%ISOPEN:
This attribute always results FALSE as the Oracle closes the SQL cursor automatically after executing its related SQL statement.
%NOTFOUND:
This attribute is the logical reverse of the %FOUND. It results TRUE if an INSERT, DELETE, or UPDATE statement affect no rows, or the SELECT INTO statement returned no rows. Or else, it results FALSE.
%ROWCOUNT:
This attribute results the number of rows affected by an INSERT, DELETE, or UPDATE statement, or returned by the SELECT INTO statement.
Important Distinctions The list of important distinctions are given below: Value versus variable Syntax versus semantics Variable versus variable reference
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Use Native Dynamic SQL A few programs (a normal-purpose report writer for illustration) should build and process a variety of SQL statements at run time. Therefore, their full
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Example of Alternative formulation as a table constraint Example: Alternative formulation as a table constraint ALTER TABLE EXAM_MARK ADD CONSTRAINT Must_be_enrolled_to_
Cursor FOR Loops In most cases that need an explicit cursor, you can simplify the coding by using a cursor FOR loop rather of the OPEN, FETCH, and CLOSE statements. A cursor FO
Managing Cursors The PL/SQL uses 2 types of cursors: implicit and explicit. The PL/SQL declares a cursor implicitly for all the SQL data manipulation statements, including th
Using PRIOR and NEXT The PRIOR(n) returns the index number that precede index n in a collection. The NEXT(n) returns the index number which succeed the index n. If n has no pr
%ISOPEN The Oracle closes the SQL cursor automatically after executing its related SQL statement. As a result, the %ISOPEN forever yields FALSE.
Effects of NULL The numeric variable X, perhaps of type INTEGER, might be assigned NULL. In that case the result of evaluating X + 1 is NULL, and so SET Y = X + 1 assigns NULL
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