Is null operator-comparison operators, PL-SQL Programming

Assignment Help:

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 NULL. And hence, to test for nullity (the state of being null), then do not use the statement

IF variable = NULL THEN...

Rather, use the statement below:

IF variable IS NULL THEN...

Related Discussions:- Is null operator-comparison operators

Procedures in pl/sql, Procedures The procedure is a subprogram which...

Procedures The procedure is a subprogram which performs a specific action. You write procedures using the syntax as shown below: PROCEDURE name [(parameter[, parameter, .

Overview of control structures-comparison operators, Overview of control st...

Overview of control structures According to the structure theorem, any computer program can be written by using the basic control structures as shown in figure below. They can b

Need database development with analysis tools, Need Database Development wi...

Need Database Development with Analysis Tools Project Description: I want a database for large governmental and private data sets on one country that can be simply extended t

Example of except operator - sql, Example of EXCEPT Operator - SQL Ex...

Example of EXCEPT Operator - SQL Example, like its counterpart in the theory book, illustrates the convenience of allowing any table expression to be the source for an INSERT

Cursor variables, What Are Cursor Variables ? The Cursor variables ar...

What Are Cursor Variables ? The Cursor variables are like C or Pascal pointers that hold the memory location (address) of some item rather of the item itself. Therefore, decl

Parameter aliasing, Parameter Aliasing To optimize the subprogram ca...

Parameter Aliasing To optimize the subprogram call, the PL/SQL compiler can decide between the two techniques of the parameter passing. With the by-value techniques, the v

Homework, What are the rates for help in writing PL/SQL procedures and func...

What are the rates for help in writing PL/SQL procedures and functions?

Character types in pl/sql, Character Types The Character types allow yo...

Character Types The Character types allow you to store alphanumeric data, represent words and text, and manipulate the character strings. CHAR You use the CHAR dataty

Open-for statement, OPEN-FOR Statement The OPEN-FOR statements execute ...

OPEN-FOR Statement The OPEN-FOR statements execute the multi-row query related with a cursor variable. It also allocates the resources used by the Oracle to process the query a

Closest approximation to relational union - sql, Closest Approximation to R...

Closest Approximation to Relational Union - SQL Actually, just as SQL has several varieties of JOIN, it also has several varieties of UNION, none of which is equivalent to th

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages