Zend PHP 5.3 Certification Exam
Databases and SQL
Functions and Arrays
Object Oriented Programming
Data Format & Types
Strings and Patterns
Web Features 1
Maria writes a query that uses outer join between two tables. Which of the following operators are not allowed in the query?
Each correct answer represents a complete solution. Choose two.
Answer options A and C are correct.
are not allowed in outer join operations. However, the operators
can be used.
is a logical operator and contains two operands. It evaluates to TRUE if either operand is TRUE and evaluates to FALSE if both operands are FALSE. Otherwise, it returns NULL.
operator replaces a condition that uses equality comparison operators and OR logical operators.
Answer option B is incorrect.
is also a logical operator and contains two operands. It evaluates to TRUE if both operands are TRUE and evaluates to FALSE if either operand is FALSE. Otherwise, it returns NULL.
Answer option D is incorrect. The
operator tests for equality.
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