Articles for Oracle9i: SQL 1Z0-007
How is top-n analysis performed?
Top-n analysis is performed using a top-n analysis query. Following is the structure of a top-n analysis query:
SELECT [column_list], ROWNUM
FROM (SELECT [column_list] FROM table
ORDER BY top-n_column)
WHERE ROWNUM <= n;
A top-n analysis query comprises the following elements:
A......
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How many types of indexes can be created?
Two types of indexes can be created. They are as follows:
Unique index: Oracle automatically creates this index when a column, in a table, is defined as a PRIMARY KEY or UNIQUE constraint.
Non-unique index: This index can be created by the user. ...
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Skills required for Oracle 1Z0-007 test.
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......
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Things to practice for Oracle test 1Z0-007.
The 1Z0-007 test focuses on your ability to use SQL statements to interact with Oracle databases. This test requires you to have a very good command over SQL. For this purpose, along with studying books and taking various practice tests, you should also practice with Oracle. While practicing with......
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What are database objects?
Database objects are data structures that are stored in an Oracle database. They are used to store data, access stored data, restrict data access, and speed up data access. Database objects can be created either by Oracle Server or a database user. An Oracle database can contain multiple database......
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What are group functions?
Group functions, also known as aggregate functions, operate on one or more groups of rows and give one result per group. They are commonly used with the GROUP BY clause in a SELECT statement, where Oracle divides the rows of a queried table or view into groups. Group functions can also......
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What are the capabilities of a SELECT statement?
Following are the capabilities of a SELECT statement:
Projection: This capability is used to choose the columns of a table, which a user wants a SELECT statement to return.
Selection: This capability is used to choose the rows of a table, which a user wants a SELECT statement to......
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What are the guidelines for naming a column?
Following are the guidelines for naming a column:
A column name must begin with a letter.
A column name must be one to thirty characters long.
A column name must not be an Oracle Server reserved word.
A column name must not duplicate the name of another column in the same table.......
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What are the guidelines for naming an Oracle database table?
Following are the guidelines for naming an Oracle database table:
A table name must begin with a letter.
A table name must be one to thirty characters long.
A table name must not be an Oracle Server reserved word.
A table name must contain only A-Z, a-z, 0-9, _, $, and #.
A table......
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What are the restrictions pertaining to the use of an outer join?
Following are the restrictions pertaining to the use of an outer join:
The outer join operator (+) can appear on only one side of the join, and it follows the column name of the table that does not have the matching rows.
The condition representing an outer join cannot use the IN......
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1Z0-007 PrepKit at a Glance
| Includes | Free | Buy |
|---|---|---|
| Version | 8.03.05 | |
| Practice Tests | 1 | 4 |
| 15 | 280 | |
| Quiz | 15 | 100 |
| Final Test | No | Yes |
| Articles, How Tos.., Tips | Yes | Yes |
| Study Notes | 26 | 104 |
Tips and How Tos for 1Z0-007 exam
