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Advantages of Exceptions
Using the exceptions for the error handling has many benefits. Without an exception handling, every time you issue a command, you should ensure for the execution errors:
BEGIN
SELECT ...
-- check for 'no data found' error
The Error processing is not clearly separated from general processing; nor is it robust. If you ignore to code a check, the error goes unobserved and is possible to cause other, apparently unrelated errors. With the exceptions, you can handle errors correctly without the requirement to code the multiple checks, which is as shown:
...
EXCEPTION
WHEN NO_DATA_FOUND THEN -- catches all 'no data found' errors
The Exceptions improve readability by letting you isolate the error-handling routines. The primary algorithm is not covered by error recovery algorithms. The Exceptions also improve reliability. You do not need to worry about checking for an error at every point it might occur. An exception handler is just adding to your PL/SQL block. If the exception is still raised in that block or any sub-block, you can be definite it will be handled.
What Is a Package? The package is a schema object that group logically related PL/SQL items, types, and subprograms. The Packages usually have 2 parts, a specification & a bo
Table Comparison - SQL The following definitions for relation comparisons: Let r1 and r2 be relations having the same heading. Then: r1 ⊆ r2 is true if every tuple of r1
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Important Distinctions The list of important distinctions are given below: Value versus variable Syntax versus semantics Variable versus variable reference
Declaring a Cursor The Forward references are not allowed in the PL/SQL. Therefore, you must declare a cursor before referencing it in other statements. Whenever you declare a
Scoping Within the similar scope, all the declared identifiers should be unique. So, even if their datatypes differ, the variables and parameters cannot share the similar name.
IS NULL Operator The IS NULL operator returns the Boolean value TRUE whenever its operand is null or FALSE if it is not null. The comparisons including the nulls always yield NU
Dynamic SQL: The Most PL/SQL programs do a predictable, specific job. For illustration, a stored procedure may accept an employee number and salary increase, and then update t
PRIMARY KEY: PRIMARY KEY indicates that the table is subject to a key constraint, in this case declaring that no two rows in the table assigned to ENROLMENT can ever have the
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