Oracle has specified more than forty objectives for 1Z0-007 (Introduction to Oracle9i: SQL) test, which are covered under thirteen topics. Following are some important areas over which one should have good command before taking the test:
- Executing a basic SELECT statement.
- Limiting the rows retrieved by a query.
- Using character, number, and date functions in SELECT statements.
- Writing SELECT statements to access data from more than one table by using equality and nonequality joins.
- Viewing data that generally does not meet a join condition by using outer joins.
- Using group functions.
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Fundamental Object-Oriented Concepts
In Java, a narrowing conversion is also known as an explicit type conversion or casting.
A byte can represent values between -128 to 127.
An array, in Java, is an ordered collection of primitives, object references, or other arrays. All the elements of an array must be of the same type, except in case of polymorphism.
Array elements are initialized to default values, wherever they are created.
The increment operator can be used in either of the two forms given below:
Numeric promotions are used to convert the operands in a numeric expression to a common type before an operation is performed between the operands.
In Java, there are two kinds of numeric promotions as follows:
- Prefix form: In the prefix form, it appears before the operand. For example, ++a;
- Postfix form: In the postfix form, it appears after the operand. For example, a ++;
- Unary numeric promotion
- Binary numeric promotion
Pass SCJA Certification Java 1.2 in a first attempt:
List the capabilities of SQL SELECT statements
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Robert G. Freeman is a Principal Engineer and Database Team Manager at the Church of Jesus Christ of Latter-Day Saints in Salt Lake City, UT, USA. He has been working with Oracle Databases for almost two decades. Robert is the author of several books including Oracle Database 10g RMAN Backup and Recovery and Oracle Database 11g New Features. Robert is an Oracle ACE, and is currently the only residing ACE in the state of Utah, USA. When not working with Oracle databases Robert may be found flying around in his airplane, kicking in karate class or just hanging out with his wife, kids, 2 cats and a dog named Denali.
Robert is a co-author for following uCertify PrepKit:
1Z0-051: OCA: Oracle Database 11g-SQL Fundamentals-I