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Sequential ControlDissimilar to the IF and LOOP statements, the GOTO and NULL statements are not important to the PL/SQL programming. The configuration of PL/SQL is such that the GOTO statement is seldom required. Seldom, it can simplify the logic enough to warrant its use. The NULL statement can improve the readability by making the meaning and action of the conditional statements clear.The Overuse of the GOTO statements can result in complex, unstructured code (art many timesKnown as the spaghetti code) which is hard to understand and maintain. Thus, use the GOTO statements sparingly. For instance, to branch from a deeply nested structure to an error-handling routine, raise an exception instead of using a GOTO statement.
DELETE Statement The DELETE statement eliminates whole rows of data from the specified table or view. Syntax:
Manipulating Local Collections Within PL/SQL, to manipulate the local collection, by using the TABLE and CAST operators . The operands of CAST are a collection declared locally
Why Use Cursor Variables ? Primarily, you use the cursor variables to pass the query result sets between the PL/SQL stored subprograms and different clients. Neither PL/SQL nor
IN Mode An IN parameter pass the values to the subprogram being called. Within the subprogram, an IN parameter acts like a constant. And hence, it cannot be assigned a value.
What are the rates for help in writing PL/SQL procedures and functions?
UNNEST operator in SQL The inverse operator of GROUP is UNGROUP. SQL has an operator, UNNEST, that can be used for similar purposes, but its method of invocation is somewhat p
Using the BULK COLLECT Clause The keywords BULK COLLECT specify the SQL engine to bulk-bind output collections before returning them to the PL/SQL engine. You can use these ke
Using the Collection Methods The collection methods below help to generalize the code and make collections easier to use and also make your applications easier to maintain:
Develop Data Business Intelligence Project Project Description: We are linking our Microsoft SQL Database to GoodData Business Intelligence. We are seeking somebody who has e
Table Literals - SQL One might expect SQL to support table literals in the manner illustrated in Example 2.2, but in fact that is not a legal SQL expression. Example: Not a
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