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FOR-LOOPWhile the number of iterations through a WHILE loop is unknown till the loop completes, then the number of iterations through a FOR loop is known before the loop is entered. The FOR loops iterate over a particular range of integers. The range is the part of an iteration scheme that is enclosed by the keywords FOR and LOOPS. A double dot (..) serve as the range operator. The syntax is as shown below:FOR counter IN [REVERSE] lower_bound..higher_bound LOOPsequence_of_statementsEND LOOP;The range is computed when the FOR loop is first entered and is never re-evaluated.As the next illustration shows, the series of statements is executed once for each integer in the range. After each of the iteration, the loop counter is incremented.FOR i IN 1..3 LOOP -- assign the values 1,2,3 to isequence_of_statements -- executes three timesEND LOOP;The following illustration shows that if the lower bound equals the higher bound, the series of the statements is executed once:FOR i IN 3..3 LOOP -- assign the value 3 to isequence_of_statements -- executes one timeEND LOOP;
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
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Create a procedure named DDPROJ_SP that retrieves project information for a specific project based on a project ID. The procedure should have two parameters: one to accept a projec
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Effects of NULL for Multiple Assignments - SQL If the row expression given as the source for a multiple assignment evaluates to NULL, then NULL is assigned to each target. If
FOR-LOOP While the number of iterations through a WHILE loop is unknown till the loop completes, then the number of iterations through a FOR loop is known before the loop is ent
Information Hiding With the information hiding, you see only the details that are significant at a given level of algorithm and data structure design. The Information hiding
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