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Assignments in pl/sqlThe Variables and constants are initialized every time a block or subprogram is entered.By default, the variables are initialized to NULL. Therefore, unless you expressly initialize the variable, its value is undefined, as the following illustration shows:DECLAREcount INTEGER;...BEGINcount := count + 1; -- assigns a null to countThe expression on the right side of the assignment operator yield NULL as count is null. To avoid the unpredicted results, never reference the variable before you assign it a value.You can use assignment statements to assign the values to a variable. For illustration, the statement below assigns a new value to the variable bonus, overwriting its older value:bonus := salary * 0.15;The expression below the assignment operator can be randomly complex, but it must yield a datatype that is similar as or convertible to the datatype of the variable.
Using FORALL and BULK COLLECT Together You can unite the BULK COLLECT clause with the FORALL statement, in that case, the SQL engine bulk-binds column values incrementally. In
Object Type: The object type is a user-defined composite datatype which encapsulates a data structure along with the functions and procedures required to manipulate the data
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
Write a cursor to open an employee database and fetch the employee record whose age is greater than 45
Effects of NULL in Aggregate Operator - SQL Let aggop(x) be an invocation of some aggregate operator aggop in SQL, where x is an expression (usually an open expression) to be
Defining and Declaring Records To create records, you have to define a RECORD type, and then declare records of that type. You may also define RECORD types in the declarative
Semidifference and NOT - SQL In this section first describe the relational difference operator, named MINUS. Example here shows SQL's closest counterpart of that operator.
Using DELETE This process has three forms. The DELETE removes all elements from the collection. DELETE(n) removes the nth element from the nested table. When n is null, then D
OUT Mode An OUT parameter returns values to the caller of a subprogram. Within the subprogram, an OUT parameter act like a variable. That means that you can use an OUT formal
Implicit Rollbacks Before execute the INSERT, UPDATE, or DELETE statement, the Oracle marks an implicit savepoint . When the statement fails, the Oracle rolls back to the save
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