General MySQL Oracle SQL Server

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Create a Stored Procedure in Oracle
How To Create a Stored Procedure in Oracle? A stored procedure is a procedure with a specified name and stored into the current database. If you want to create a stored procedure, you can use the CREATE PROCEDURE statement. The example script below creates a stored procedure: SQL&gt; CREATE PROC... 2018-11-11, 3441🔥, 0💬

Working with Cursors in Oracle PL/SQL
Where to find answers to frequently asked questions on Working with Cursors in Oracle PL/SQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Working with Cursors in Oracle PL/SQL. Clear answers are provided with tutorial exercises on defining, op... 2018-02-01, 3439🔥, 0💬

Create an Initialization Parameter File in Oracle
How To Create an Initialization Parameter File in Oracle? This is Step 3. To run an Oracle database as an Oracle instance, you need to create an initialization parameter file, which contains a set of initialization parameters. The easiest way to create an initialization parameter file to copy from t... 2019-04-03, 3435🔥, 0💬

Create a New Data File in Oracle
How To Create a New Oracle Data File in Oracle? There is no dedicated statement to create a data file. Data files are created as part of statements that manages other data structures, like tablespace and database.   ⇒ Create a New Tablespace in Oracle ⇐ Show All Data Files in the Current Database i... 2019-04-13, 3432🔥, 0💬

Error: Cannot Identify/Lock Data File in Oracle
What Happens If You Lost a Data File in Oracle? After you shutting down an Oracle database, you accidently deleted a data file from the operating system. If you try to start the database again you will get error when Oracle tries to open the database after mounting the database. The following tutori... 2019-04-09, 3431🔥, 0💬

Ways to Start a New Transaction in Oracle
How To Start a New Transaction in Oracle? There is no SQL statement to explicitly start a new transaction. Oracle server implicitly starts a new transaction with the following two conditions: The first executable statement of a new user session will automatically start a new transaction. The first e... 2019-09-16, 3430🔥, 0💬

Managing Oracle Database Tables
Where to find answers to frequently asked questions on Managing Oracle Database Tables? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Oracle Database Tables. Clear answers are provided together with tutorial exercises to help beginners ... 2019-06-11, 3408🔥, 0💬

ANSI Data Types in Oracle
What Are the ANSI Data Types Supported in Oracle in Oracle? The following ANSI data types are supported in Oracle: CHARACTER(n) / CHAR(n) CHARACTER VARYING(n) / CHAR VARYING(n) NATIONAL CHARACTER(n) / NATIONAL CHAR(n) / NCHAR(n) NATIONAL CHARACTER VARYING(n) / NATIONAL CHAR VARYING(n) / NCHAR VARYIN... 2020-04-14, 3405🔥, 0💬

Start the Default Instance in Oracle
How To Use "startup" Command to Start Default Instance in Oracle? If you logged in to the server as a SYSDBA, you start the default instance with the "startup" command. Here is how to start the default instance in SQL*Plus in SYSDBA mode: &gt;.\bin\sqlplus Enter user-name: SYSTEM/fyicenter AS SY... 2020-09-15, 3398🔥, 0💬

Show All Columns in an Existing Table in Oracle
How To View All Columns in an Existing Table in Oracle? If you have an existing table and want to know how many columns are in the table and how they are defined, you can use the system view USER_TAB_COLUMNS as shown in the following tutorial exercise: SQL&gt; COL data_type FORMAT A12; SQL&g... 2019-05-14, 3397🔥, 0💬

Rename an Index in Oracle
How To Rename an Index in Oracle? Let's say you have an existing index, and you don't like its name anymore for some reason, you can rename it with the ALTER INDEX ... RENAME TO statement. Here is an example script on how to rename an index: CREATE TABLE student (id NUMBER(5) PRIMARY KEY, first_name... 2019-05-01, 3392🔥, 0💬

Open a Cursor Variable in Oracle
How To Open a Cursor Variable in Oracle? A cursor variable must be opened with a specific query statement before you can fetch data fields from its data rows. To open a cursor variable, you can use the OPEN ... FOR statement as shown in the following tutorial exercise: CREATE OR REPLACE PROCEDURE FY... 2018-07-18, 3387🔥, 0💬

Export Connection Information to a File in Oracle
How To Export Your Connection Information to a File in Oracle? SQL Developer allows you to export your connection information into an XML file. Here is how to do this: Right-click on Connections Select Export Connection... Enter File Name as: \temp\connections.xml Click OK Open \temp\connections.xml... 2018-10-08, 3383🔥, 0💬

Run SQL Statement through Web UI in Oracle
How To Run SQL Statements through the Web Interface in Oracle? If you don't like the command line interface offered by SQL*Plus, you can use the Web interface to run SQL statements. Here is how: Open your Web browser to http://localhost:8080/apex/ Log in to the server with the predefined sample user... 2019-05-01, 3371🔥, 0💬

Loading and Exporting Data in Oracle
Where to find answers to frequently asked questions on Loading and Exporting Data in Oracle? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Loading and Exporting Data in Oracle. Clear answers are provided with tutorial exercises on saving data as... 2018-06-27, 3367🔥, 0💬

Login to Server without an Instance in Oracle
How To Login to the Server without an Instance in Oracle? If your default instance is in trouble, and you can not use the normal login process to reach the server, you can use a special login to log into the server without any instance. Here is how to use SQL*Plus to log in as a system BDA: &gt;... 2020-09-15, 3363🔥, 0💬

Enter Comments in PL/SQL in Oracle
How To Enter Comments in PL/SQL in Oracle? There are two ways to enter comments into PL/SQL codes: SQL Statement Style: Starts you comment any where in the line but prefixed with '--'. The comment ends at the end of the line. C Language Style: Starts you comment any where in the line with '/*' and e... 2018-12-26, 3359🔥, 0💬

Initialize Variables with Default Values in Oracle
How To Initialize Variables with Default Values in Oracle? There are two ways to assign default values to variables at the time of declaration: Using key word DEFAULT - Appending "DEFAULT value" to the end of declaration statements. Using assignment operator - Appending ":= value" to the end of decl... 2018-08-06, 3359🔥, 0💬

Date and Time Interval Literals in Oracle
How To Write Date and Time Interval Literals in Oracle? Date and time interval literals can coded as shown in the following samples: SELECT DATE '2002-10-03' + INTERVAL '123-2' YEAR(3) TO MONTH FROM DUAL -- 123 years and 2 months is added to 2002-10-03 03-DEC-25 SELECT DATE '2002-10-03' + INTERVAL '... 2020-03-25, 3358🔥, 0💬

Start 10g XE Server in Oracle
How To Start Your 10g XE Server in Oracle? Go to the Start menu, select All Programs, Oracle Database 10g Express Edition, and Start Database.   ⇒ Memory Usage of 10g XE Server in Oracle ⇐ Shutdown 10g XE Server in Oracle ⇑ Introduction to Oracle Database 10g Express Edition ⇑⇑ Oracle Database Tut... 2020-10-10, 3357🔥, 0💬

Scalar Data Types Supported in PL/SQL in Oracle
How Many Scalar Data Types Are Supported in PL/SQL in Oracle? PL/SQL supports many scalar data types divided into 4 groups: Numeric Types: BINARY_DOUBLE, BINARY_FLOAT, BINARY_INTEGER, DEC, DECIMAL, DOUBLE PRECISION, FLOAT, INT, INTEGER, NATURAL, NATURALN, NUMBER, NUMERIC, PLS_INTEGER, POSITIVE, POSI... 2018-11-17, 3357🔥, 0💬

Count the Number of Rows with SELECT Statements in Oracle
How To Use SELECT Statement to Count the Number of Rows in Oracle? If you want to count the number of rows, you can use the COUNT(*) function in the SELECT clause. The following select statement returns the number of rows in the "department" table: SQL&gt; SELECT COUNT(*) FROM departments; COUNT... 2019-12-19, 3355🔥, 0💬

Understanding PL/SQL Language Basics
Where to find answers to frequently asked questions on Understanding PL/SQL Language Basics? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Understanding PL/SQL Language Basics. It can also be used as learning tutorials on defining variables, ass... 2018-12-26, 3354🔥, 0💬

Invoke the Data Pump Export Utility in Oracle
How To Invoke the Data Pump Export Utility in Oracle? The Data Pump Export utility is distributed as executable file called "expdp.exe". To invoke this utility, you should go to the "bin" directory of your Oracle server installation and run the "expdp" command. Here is tutorial exercise on how to in... 2016-10-15, 3350🔥, 0💬

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General MySQL Oracle SQL Server