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Logical OperatorsThe logical operators AND, NOT, and OR follow the tri-state logic shown in table below. The AND and OR are binary operators; NOT is a unary operator.
Table: Logic Truth Table
As the truth table shown below, the AND returns TRUE only if both its operands are true. On the other hand, the OR returns TRUE if either of its operands is true. The NOT returns the opposite value (logical negation) of its operand. For illustration, NOT TRUE returns FALSE.The NOT NULL returns NULL as nulls are indeterminate. It follows that if you apply the NOT operator to a null, the answer is also indeterminate.
Parameter and Keyword Description: collection_name: This keyword identifies the index-by table, nested table, or varray formerly declared within the present scope. cu
Short-Circuit Evaluation When computing a logical expression, the PL/SQL uses short-circuit evaluation. That is, the PL/SQL stops computing the expression as soon as the result
heap sort program in pl/sql
Example of Alternative formulation as a table constraint Example: Alternative formulation as a table constraint ALTER TABLE EXAM_MARK ADD CONSTRAINT Must_be_enrolled_to_
INSERT Statement The INSERT statement adds fresh rows of data to the specified database table or view. Syntax:
PITS Depressions in secondary cell wall is called pit. A pit present on the free cell wall surface without its partner is called Blind pit. It consists of 2 parts -
Parameter & Keyword Description: function_name: The user-defined function is identifying by that keyword. parameter_name: This identifies the formal parameter that
Other monadic - SQL In 2VL there are just 4 (2 2 ) monadic operators, of which negation is really the only "useful" one. When a third truth value is introduced we have 27 (3 3
Example of COALESCE operator Example: Give the total of marks for each exam (simplified solution) SELECT CourseId, COALESCE ((SELECT SUM (Mark) FROM EXAM_MARK AS EM
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