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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.
Accessing Attributes: You can refer to an attribute only by its name not by its position in the object type. To access or modify the value of an attribute, you can use the dot
which operation is used if we are interested in only certain columns of a table?
Rollback Behavior When a FORALL statement fails, the database changes are rolled back to an implicit savepoint marked before each of the SQL statement execution. The Changes t
Example of Shorthand for a row constraint Example: Shorthand for a row constraint ALTER TABLE EXAM_MARK ADD CONSTRAINT Mark_in_range CHECK (Mark BETWEEN 0 AND 100);
Data Types in SQL - XML, Array, Row BINARY LARGE OBJECT for arbitrarily large bit strings. XML for XML documents and fragments. ARRAY types for arrays.
Existential Quantification - SQL Existential quantification-stating that something is true of at least one object under consideration-can be expressed by OR(r,c), meaning tha
Example of UNWRAP Operator - SQL Example here shows how unwrapping can be done in longhand in SQL. Example: Unwrapping in SQL Letting CONTACT_INFO_WRAPPED denote the res
Logical Operators The logical operators AND, NOT, and OR follow the tri-state logic shown in table below. The AND and OR are binary operators; NOT is a unary operator.
Declaring Cursor Variables Once a REF CURSOR type is define by you, and then you can declare the cursor variables of that type in any PL/SQL block or subprogram. In the exampl
Nested Tables versus Index-by Tables The Index-by tables and nested tables are just similar. For e.g. They have similar structure and their individual elements are accessed in
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