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Naming ConventionsThe similar naming conventions apply to all PL/SQL program items and units including the variables, cursors, constants, cursor variables, procedures, exceptions, functions, and packages. The Names can be simple, remote, qualified, or both qualified and remote. For illustration, you might use the procedure name raise_salary in any of the following ways shown below:raise_salary(...); -- simpleemp_actions.raise_salary(...); -- qualifiedraise_salary@newyork(...); -- remoteemp_actions.raise_salary@newyork(...); -- qualified and remoteIn the first condition, you basically use the procedure name. In the second condition, you should qualify the name using the dot notation as the procedure is stored in a package named as the emp_actions. In the third condition, using the remote access indicator (@), you reference the database link newyork as the procedure is stored in the remote database. In the fourth condition, you qualify the procedure name and reference the database link.
Obtaining a natural join by specifying the common columns Synatax: SELECT * FROM IS_CALLED JOIN IS_ENROLLED_ON USING ( StudentId ) However, a named columns join doe
How Calls Are Resolved? The figure shows that how the PL/SQL compiler resolves the subprogram calls. When the compiler encounters the procedure or function call, it tries to di
Tables within a Table - SQL Figure here is an exact copy of the one in the theory book and as before it is just an alternative way of representing some of the information con
Procedures The procedure is a subprogram which performs a specific action. You write procedures using the syntax as shown below: PROCEDURE name [(parameter[, parameter, .
Effect of Anonymous Columns Now, recall that a VALUES expression denotes a table with undefined column names. If an initial value is to be specified when a base table is creat
Comparison Operators The Comparison operators can compare one expression to another. The outcome is always true, false, or null. Usually, you use a comparison operators in condi
ROWNUM The ROWNUM returns a number representing the order in which a row was selected from the table. The first row selected has a ROWNUM of 1; the second row has a ROWNUM of
%ISOPEN The %ISOPEN yields TRUE if its cursor or cursor variable is open; or else, the %ISOPEN yields FALSE. In the illustration, you use the %ISOPEN to select an action:
Recursion The Recursion is a powerful method for simplify the design of the algorithms. Principally, the recursion means the self-reference. In the recursive mathematical serie
Renaming Columns - SQL SQL has no direct counterpart of RENAME. To derive the table on the right in Figure 4.4 from the table on the left, Tutorial D has IS_CALLED RENAME ( St
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