General MySQL Oracle SQL Server

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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, 2924🔥, 0💬

ODBC Drivers and DSN Configuration for Oracle
Where to find answers to frequently asked questions on ODBC Drivers, DSN Configuration and ASP Connection for Oracle? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team ODBC Drivers, DSN Configuration and ASP Connection for Oracle. Clear answers are pro... 2016-10-15, 2921🔥, 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, 2912🔥, 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, 2909🔥, 0💬

How Many Anonymous Blocks Can Be Defined in Oracle
How Many Anonymous Blocks Can Be Defined in Oracle? 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 defined block, as shown in the fol... 2018-10-30, 2907🔥, 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, 2906🔥, 0💬

Manage Transaction Isolation Levels in Oracle
How To Manage Transaction Isolation Level in Oracle? Transaction isolation level can be managed in a procedure by using the SET TRANSACTION and COMMIT statements. Here is a sample script on how to manage transaction isolation level: SQL&gt; CREATE OR REPLACE PROCEDURE HR.TOTAL_SALARY AS 2 total_... 2019-03-08, 2904🔥, 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, 2904🔥, 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, 2901🔥, 0💬

Query with a Left Outer Join in Oracle
How To Write a Query with a Left Outer Join in Oracle? If you want to query from two tables with a left outer join, you can use the LEFT OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a left outer join from two tables: departments and employees. The join conditi... 2019-10-18, 2889🔥, 0💬

Download-Oracle-SQL-Developer in Oracle
How To Download Oracle SQL Developer in Oracle? If you want to download a copy of Oracle SQL Developer, visit http://www.oracle.com/technolo gy/software/products/sql/.If you are using Windows systems, click the "Oracle SQL Developer for Windows" link. This allows you to download the Windows version ... 2019-02-05, 2884🔥, 0💬

Download-Oracle-SQL-Developer in Oracle
How To Download Oracle SQL Developer in Oracle? If you want to download a copy of Oracle SQL Developer, visit http://www.oracle.com/technolo gy/software/products/sql/.If you are using Windows systems, click the "Oracle SQL Developer for Windows" link. This allows you to download the Windows version ... 2019-02-05, 2884🔥, 0💬

PL/SQL Anonymous Block in Oracle
What Is an Anonymous Block in Oracle? An anonymous block is a PL/SQL code block with no name. It consists of three parts: Declaration Part - Defining local variables and local procedures. Declaration part is optional. Execution Part - Defining execution logic with executable statements. Execution pa... 2018-11-29, 2883🔥, 0💬

Create Your Own Reports in SQL Developer in Oracle
How To Create Your Own Reports in SQL Developer in Oracle? Oracle SQL Developer also lets you create your own reports. See the following steps on how to do this: Click menu View. Selects Reports from the menu. Open Reports. Right-click on User Defined Reports. Select Add Report. Enter Name as: My Te... 2019-01-26, 2879🔥, 0💬

Show Free Space in a Tablespace in Oracle
How To See Free Space of Each Tablespace in Oracle? One of the important DBA tasks is to watch the storage usage of all the tablespaces to make sure there are enough free space in each tablespace for database applications to function properly. Free space information can be monitored through the USER... 2019-01-01, 2874🔥, 0💬

Text Literals in Oracle
How To Write Text Literals in Oracle? There are several ways to write text literals as shown in the following samples: SELECT 'FYICenter.com' FROM DUAL -- The most common format FYICenter.com SELECT 'It''s Sunday!' FROM DUAL -- Single quote escaped It's Sunday! SELECT N'Allo, C''est moi.' FROM DUAL ... 2020-04-14, 2870🔥, 0💬

Setup Autotrace for a User Account in Oracle
How To Set Up Autotrace for a User Account in Oracle? If an Oracle user wants to use the autotrace feature, you can use the tutorial as an example to create the required table PLAN_TABLE, the required security role PLUSTRACE, and grant the role to that user: SQL&gt; CONNECT HR/retneciyf SQL&... 2020-06-08, 2868🔥, 0💬

Group Functions Used with Non-group Selection Fields in Oracle
Can Group Functions Be Mixed with Non-group Selection Fields in Oracle? If a group function is used in the SELECT clause, all other selection fields must be group level fields. Non-group fields can not be mixed with group fields in the SELECT clause. The script below gives you an example of invalid ... 2019-11-21, 2868🔥, 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, 2868🔥, 0💬

What Is NULL in PL/SQL in Oracle
What Is NULL in PL/SQL in Oracle? NULL is a reserved key word and it stands for two things in PL/SQL: NULL is an executable statement, and means doing nothing. NULL is a data value, and means no value. The following sample script shows you examples of using NULL keyword: DECLARE next_task CHAR(80); ... 2018-07-13, 2868🔥, 0💬

Start an Oracle Instance in Oracle
How To Start an Oracle Instance in Oracle? This is Step 6. Now you are ready to start the new Oracle Instance without any database. This instance will be used to create a database. Starting an instance without database can be done by using STARTUP NOMOUNT statement as shown below: &gt;.\bin\sqlp... 2018-05-08, 2868🔥, 0💬

Invoke the Data Pump Import Utility in Oracle
How To Invoke the Data Pump Import Utility in Oracle? The Data Pump Import utility is distributed as executable file called "impdp.exe". To invoke this utility, you should go to the "bin" directory of your Oracle server installation and run the "impdp" command. Here is tutorial exercise on how to in... 2016-10-15, 2868🔥, 0💬

What Is a Function in Oracle
What Is a Function in Oracle? A function is a named program unit. It consists of three parts: Declaration Part - Defining the function name, calling parameters, return value type, local variables and local procedures. Declaration part is required. Execution Part - Defining execution logic with execu... 2018-01-27, 2866🔥, 0💬

Test NULL Values in Oracle
How To Test NULL Values in Oracle? There ate two special comparison operators you can use on NULL values: "variable IS NULL" - Returns TRUE if the variable value is NULL. "variable IS NOT NULL" - Return TRUE if the variable value is not NULL. The following sample script shows you examples of compari... 2018-07-13, 2862🔥, 0💬

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General MySQL Oracle SQL Server