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How To Define a Data Field as NOT NULL
How To Define a Data Field as NOT NULL? - Oracle DBA FAQ - Working with Database Objects in PL/SQL When defining a specific RECORD type, you can define a data field as NOT NULL to make sure variables with this RECORD type to always have values in this field. A field defined as NOT NULL must have a d... 2007-04-27, 5197👍, 0💬

What Are Date Functions
What Are Date Functions? Date Functions are ADD_MONTHS, LAST_DAY, NEXT_DAY, MONTHS_BETWEEN and SYSDATE. 2007-04-15, 5194👍, 0💬

How To Retrieve Data from an Cursor to a RECORD
How To Retrieve Data from an Cursor to a RECORD? - Oracle DBA FAQ - Working with Cursors in PL/SQL If you have a cursor opened ready to use, you can also use the FETCH statement to retrieve data from the cursor into a RECORD variable as shown in the tutorial exercise below: CREATE OR REPLACE PROCEDU... 2007-04-29, 5189👍, 0💬

When to Use SELECT INTO Statements
When to Use SELECT INTO Statements? The SELECT INTO Statement is most often used to create backup copies of tables or for archiving records. SELECT column_name(s) INTO newtable [IN externaldatabase] FROM source SELECT column_name(s) INTO newtable [IN externaldatabase] FROM source WHERE column_name o... 2007-04-15, 5189👍, 0💬

What Is Commit
What Is Commit? Commit is an event that attempts to make data in the database identical to the data in the form. It involves writing or posting data to the database and committing data to the database. Forms check the validity of the data in fields and records during a commit. Validity check are uni... 2007-04-15, 5187👍, 0💬

What Is Locking
What Is Locking? Locking are mechanisms intended to prevent destructive interaction between users accessing data. Locks are used to achieve. 2007-04-15, 5178👍, 0💬

In What Order Different Parts of SQL Statements Are Executed
In What Order Different Parts of SQL Statements Are Executed? Where clause, Group By clause, Having clause, Order By clause and Select. 2007-04-15, 5176👍, 0💬

What Are DDL Statements
What are the most important DDL statements in SQL? CREATE TABLE - creates a new database table ALTER TABLE - alters (changes) a database table DROP TABLE - deletes a database table CREATE INDEX - creates an index (search key) DROP INDEX - deletes an index 2007-04-15, 5174👍, 0💬

How To Use FETCH Statement in a Loop
How To Use FETCH Statement in a Loop? - Oracle DBA FAQ - Working with Cursors in PL/SQL If you have a cursor opened ready to use, you can also use the FETCH statement in a loop to retrieve data from the cursor more efficiently. But you need to remember to use an EXIT statement break the loop when th... 2007-04-29, 5173👍, 0💬

What Are Data Types Limitations
What Are Data Types Limitations? Max. columns in a table is 255. Max. Char size is 255, Long is 64K and Number is 38 digits. Cannot Query on a long column. Char, Varchar2 Max. size is 2000 and default is 1 byte. Number(p,s) p is precision range 1 to 38, s is scale -84 to 127. Long Character data of ... 2007-04-15, 5169👍, 0💬

Can Variables Be Used in SQL Statements
Can Variables Be Used in SQL Statements? - Oracle DBA FAQ - Working with Database Objects in PL/SQL Yes, you can use variables in SQL statements as part of any expressions. The tutorial script provides you some good examples: (Connect to XE with SQL*Plus) CREATE TABLE student (id NUMBER(5) PRIMARY K... 2007-04-28, 5165👍, 0💬

How To Create a Stored Program Unit
How To Create a Stored Program Unit? - Oracle DBA FAQ - Introduction to PL/SQL If you want to create a stored program unit, you can use the CREATE PROCEDURE or FUNTION statement. The example script below creates a stored program unit: SQL> set serveroutput on; SQL> CREATE PROCEDURE Hello AS 2 BEGIN ... 2007-04-25, 5160👍, 0💬

What Is the Implicit Cursor
What Is the Implicit Cursor? - Oracle DBA FAQ - Working with Cursors in PL/SQL There is only one implicitly cursor in a session. The implicit cursor is the cursor automatically defined by PL/SQL for you. Whenever a SQL statement is executed, this cursor will be assigned to represent the execution of... 2007-04-29, 5151👍, 0💬

How To Define an Explicit Cursor
How To Define an Explicit Cursor? - Oracle DBA FAQ - Working with Cursors in PL/SQL An explicit cursor must be defined in the declaration part of a procedure or function with the CURSOR ... IS statement as shown in the following sample script: DECLARE CURSOR c_list IS SELECT * FROM countries; CURSOR... 2007-04-29, 5151👍, 0💬

How To Define a Specific RECORD Type
How To Define a Specific RECORD Type? - Oracle DBA FAQ - Working with Database Objects in PL/SQL If you want to define a specific RECORD type, you need to use the TYPE ... IS RECORD statement in the declaration part of any procedure or function. The following example script defines a RECORD type cal... 2007-04-27, 5141👍, 0💬

What Is PL/SQL
What Is PL/SQL? - Oracle DBA FAQ - Introduction to PL/SQL PL/SQL is a modern, block-structured programming language. It provides several features that make developing powerful database applications very convenient. For example, PL/SQL provides procedural constructs, such as loops and conditional sta... 2007-04-25, 5141👍, 0💬

Operators used in SELECT statements
Name some operators used in SELECT statements = Equal or != Not equal > Greater than = Greater than or equal <= Less than or equal BETWEEN Between an inclusive range LIKE Search for a pattern 2007-04-15, 5120👍, 0💬

How Many Anonymous Blocks Can Be Defined
How Many Anonymous Blocks Can Be Defined? - Oracle DBA FAQ - Introduction to PL/SQL An anonymous block is stored in the user's current session without any name. So you can only define one anonymous block at any time. If you define another anonymous block, the new block will replace the previously de... 2007-04-25, 5117👍, 0💬

What Is a Transaction
What Is a Transaction? Transaction is defined as all changes made to the database between successive commits. 2007-04-15, 5109👍, 0💬

How To Use SQL Statements in PL/SQL
How To Use SQL Statements in PL/SQL? - Oracle DBA FAQ - Introduction to PL/SQL SQL DML (Data Manipulation Language) statements can be included in PL/SQL code blocks directly without any changes. See the script below for examples: SQL> CREATE TABLE tip (id NUMBER(5) PRIMARY KEY, 2 subject VARCHAR(80)... 2007-04-25, 5103👍, 0💬

That Is a Correlated Subquery
That Is a Correlated Subquery? Correlated Subquery is a subquery that is evaluated once for each row processed by the parent statement. Parent statement can be Select, Update or Delete. Use Correlated Subquery to answer multipart questions whose answer depends on the value in each row processed by p... 2007-04-15, 5093👍, 0💬

What Are the Types PL/SQL Code Blocks
What Are the Types PL/SQL Code Blocks? - Oracle DBA FAQ - Introduction to PL/SQL There are 3 types of PL/SQL code blocks: Anonymous Block - A block of codes with no name. It may contain a declaration part, an execution part, and exception handlers. Stored Program Unit - A block of codes with a name.... 2007-04-25, 5092👍, 0💬

How To Define a Variable to Match a Table Column Data Type
How To Define a Variable to Match a Table Column Data Type? - Oracle DBA FAQ - Working with Database Objects in PL/SQL If you have a table, and want to define some variables to have exactly the same data types as some columns in that table, you can use table_name.column_name%TYPE as data types to de... 2007-04-26, 5089👍, 0💬

Sample SELECT Statements
Write some simple SELECT Statements SELECT column_name(s) FROM table_name SELECT DISTINCT column_name(s) FROM table_name SELECT column FROM table WHERE column operator value SELECT column FROM table WHERE column LIKE pattern SELECT column,SUM(column) FROM table GROUP BY column SELECT column,SUM(colu... 2007-04-15, 5083👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML