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How To Update Values in a Table
How To Update Values in a Table? - Oracle DBA FAQ - Understanding SQL DML Statements If you want to update some values in one row or multiple rows in a table, you can use the UPDATE statement. The script below shows a good example: UPDATE fyi_links SET counts = 999, notes = 'Good site.' WHERE id = 1... 2007-04-21, 5249👍, 0💬

What Happens to the Current Transaction If the Session Is Killed
What Happens to the Current Transaction If the Session Is Killed? - Oracle DBA FAQ - Understanding SQL Transaction Management If a session is killed by the DBA, the current transaction in that session will be rolled back and ended. All the database changes made in the current transaction will be rem... 2007-04-18, 5249👍, 0💬

How To Insert a Record into a Table
How To Insert a Record into a Table? - Oracle DBA FAQ - Working with Database Objects in PL/SQL If you have a RECORD variable with data fields matching a table structure, you can insert a row to this table with this RECORD variable using the INSERT statement as shown in the example below: CREATE TAB... 2007-04-26, 5247👍, 0💬

How To View the Tablespaces in the Current Database
How To View the Tablespaces in the Current Database? - Oracle DBA FAQ - Managing Oracle Tablespaces and Data Files If you want to get a list of all tablespaces used in the current database instance, you can use the DBA_TABLESPACES view as shown in the following SQL script example: SQL> connect SYSTE... 2007-05-03, 5245👍, 0💬

What To Do If the Binary SPFile Is Wrong for the Default Instance
What To Do If the Binary SPFile Is Wrong for the Default Instance? - Oracle DBA FAQ - Introduction to Oracle Database 10g Express Edition Let's say the SPFile for the default instance is a binary file, and some settings are wrong in the SPFile, like SGA setting is bellow 20MB, how do you change a se... 2007-04-25, 5245👍, 0💬

How To Add Another Datafile to a Tablespace
How To Add Another Datafile to a Tablespace? - Oracle DBA FAQ - Managing Oracle Tablespaces and Data Files If you created a tablespace with a data file a month ago, now 80% of the data file is used, you should add another data file to the tablespace. This can be done by using the ALTER TABLESPACE ..... 2007-05-03, 5244👍, 0💬

How To Download Oracle Database 10g XE
How To Download Oracle Database 10g XE? - Oracle DBA FAQ - Introduction to Oracle Database 10g Express Edition If you want to download a copy of Oracle Database 10g Express Edition, visit http://www.oracle.com/technolo gy/software/products/database/ xe/.If you are using Windows systems, there are dow... 2007-04-23, 5239👍, 0💬

What Is Oracle SQL Developer
What Is Oracle SQL Developer? - Oracle DBA FAQ - Introduction to Oracle SQL Developer Oracle SQL Developer is a new, free graphical tool that enhances productivity and simplifies database development tasks. With SQL Developer, you can browse database objects, run SQL statements and SQL scripts, and ... 2007-04-26, 5238👍, 0💬

How To Write Numeric Literals
How To Write Numeric Literals? - Oracle DBA FAQ - Understanding SQL Basics Numeric literals can coded as shown in the following samples: SELECT 255 FROM DUAL -- An integer 255 SELECT -6.34 FROM DUAL -- A regular number -6.34 SELECT 2.14F FROM DUAL -- A single-precision floating point 2.14 SELECT -0.... 2007-04-24, 5237👍, 0💬

How To Convert Dates to Characters
How To Convert Dates to Characters? - Oracle DBA FAQ - Understanding SQL Basics You can convert dates to characters using the TO_CHAR() function as shown in the following examples: SELECT TO_CHAR(SYSDATE, 'DD-MON-YYYY') FROM DUAL; -- SYSDATE returns the current date 07-MAY-2006 SELECT TO_CHAR(SYSDAT... 2007-04-23, 5234👍, 0💬

Can You Drop an Index Associated with a Unique or Primary Key Constraint
Can You Drop an Index Associated with a Unique or Primary Key Constraint? - Oracle DBA FAQ - Managing Oracle Table Indexes You can not delete the index associated with a unique or primary key constraint. If you try, you will get an error like this: ORA-02429: cannot drop index used for enforcement o... 2007-05-02, 5233👍, 0💬

How To Get a List of All User Accounts in the Database
How To Get a List of All User Accounts in the Database? - Oracle DBA FAQ - Introduction to Oracle SQL Developer If you don't like to use a SELECT statement to get a list of all user accounts in the current database, you can use the Reports view to do this as shown in the following tutorial example. ... 2007-04-27, 5233👍, 0💬

What To Do If the StartBD.bat Failed to Start the XE Instance
What To Do If the StartBD.bat Failed to Start the XE Instance? - Oracle DBA FAQ - Introduction to Oracle Database 10g Express Edition If StartBD.bat failed to start the XE instance, you need to try to start the instance with other approaches to get detail error messages on why the instance can not b... 2007-04-24, 5231👍, 0💬

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, 5229👍, 0💬

How To Use Group Functions in the SELECT Clause
How To Use Group Functions in the SELECT Clause? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements If group functions are used in the SELECT clause, they will be used on the rows that meet the query selection criteria, the output of group functions will be returned as output of the query.... 2007-04-20, 5229👍, 0💬

How To Create an Oracle Database Manually
How To Create an Oracle Database Manually? - Oracle DBA FAQ - Creating New Database Instance Manually Based on Oracle's Administrator Guide, there are 11 steps to create a database with the CREATE DATABASE statement: Step 1: Decide on Your Instance Identifier (SID) Step 2: Establish the Database Adm... 2007-04-22, 5228👍, 0💬

Is Oracel SQL Developer written in Java
Is Oracel SQL Developer written in Java? - Oracle DBA FAQ - Introduction to Oracle SQL Developer Oracel SQL Developer is written in Java. It requires JDK 1.5, which is already included in your download file. 2007-04-26, 5227👍, 0💬

What Is SQL
What Is SQL? - Oracle DBA FAQ - Understanding SQL Basics SQL, SEQUEL (Structured English Query Language), is a language for RDBMS (Relational Database Management Systems). SQL was developed by IBM Corporation. 2007-04-24, 5227👍, 0💬

What Happens to the Data Files If a Tablespace Is Dropped
What Happens to the Data Files If a Tablespace Is Dropped? - Oracle DBA FAQ - Managing Oracle Tablespaces and Data Files If a tablespace is dropped, what happens to its data files? By default, data files will remain in OS file system, even if the tablespace they are mapped is dropped. Of course, you... 2007-05-03, 5222👍, 0💬

How To Create a Server Parameter File
How To Create a Server Parameter File? - Oracle DBA FAQ - Creating New Database Instance Manually This is Step 5. The initialization parameter file is good to get an Oracle database instance started. But it is not ideal run an instance as production. You need to convert the initialization parameter ... 2007-04-23, 5215👍, 0💬

What Is the Quickest Way to Export a Table to a Flat File
What Is the Quickest Way to Export a Table to a Flat File? - Oracle DBA FAQ - Loading and Exporting Data The quickest way to export a table to a flat file is probably to use the SQL*Plus SPOOL command. It allows you to record SELECT query result to a text file on the operating system. The following ... 2007-04-30, 5214👍, 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, 5213👍, 0💬

What Do You Think about Oracle SQL Developer
What Do You Think about Oracle SQL Developer? - Oracle DBA FAQ - Introduction to Oracle SQL Developer To conclude this introductory FAQ collection, you should think about Oracle SQL Developer in comparison with other client tools like SQL*Plus and Oracle Web interface. SQL Developer is definitely be... 2007-04-28, 5213👍, 0💬

How To Filter Out Duplications in the Returning Rows
How To Filter Out Duplications in the Returning Rows? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements If there are duplications in the returning rows, and you want to remove the duplications, you can use the keyword DISTINCT or UNIQUE in the SELECT clause. The tutorial exercise below sh... 2007-04-20, 5212👍, 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