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Anatomy of a Table:
Figure shows the terminology used in SQL to refer to parts of the structure of a table.
As you can see, SQL has no official terms for its counterparts of the heading and body of a relation, but for convenience I do use those terms occasionally in the present book as applying to tables. SQL's counterpart of relational attribute is column. The figure shows the term field being used for SQL's counterpart of attribute value but please note that the international standard uses this term not only for a component of a row, as shown, but also for the corresponding component of the relevant row type.
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MERGE and TRUNCATE in SQL SQL has two more table update operators, MERGE and TRUNCATE. MERGE, like INSERT, takes a source table s and uses it to update a target table t. Brief
Forward Declarations The PL/SQL needs that you declare an identifier before using it. And hence, you should declare a subprogram before calling it. For illustration, the decla
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Methods: In normal, a method is a subprogram declared in an object type specification using the keyword MEMBER or STATIC. The method cannot have similar name as the object typ
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