General MySQL Oracle SQL Server

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Revoke CREATE SESSION Privilege in Oracle
How To Revoke CREATE SESSION Privilege from a User in Oracle? If you take away the CREATE SESSION privilege from a user, you can use the REVOKE command as shown in the following example script: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter SQL&gt; REVOKE CREATE SESSION FROM d... 2019-07-09, 3421🔥, 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, 3421🔥, 0💬

Show the Server Version in Oracle
How To Check the Server Version in Oracle? Oracle server version information is stored in a table called: PRODUCT_COMPONENT_VERSION. You can use a simple SELECT statement to view the version information like this: &gt;.\bin\sqlplus Enter user-name: SYSTEM/fyicenter AS SYSDBA Connected to an idle... 2020-09-15, 3420🔥, 0💬

Managing Oracle Table Indexes
Where to find answers to frequently asked questions on Managing Oracle Table Indexes? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Oracle Table Indexes. The clear answers and sample scripts provided can be used as learning tutorials or... 2019-05-10, 3417🔥, 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, 3416🔥, 0💬

Delete an Existing Row from a Table in Oracle
How To Delete an Existing Row from a Table in Oracle? If you want to delete an existing row from a table, you can use the DELETE statement with a WHERE clause to identify that row. Here is good sample of DELETE statements: INSERT INTO fyi_links (url, id) VALUES ('http://www.myspace.com', 301); 1 row... 2020-01-04, 3413🔥, 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, 3411🔥, 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, 3407🔥, 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, 3404🔥, 0💬

Name Conflicts between Variables and Columns in Oracle
How To Resolve Name Conflicts between Variables and Columns in Oracle? The best way to resolve name conflicts is to avoid using column names for variables.   ⇒ Assign Query Results to Variables in Oracle ⇐ Variable Names Collide with Column Names in Oracle ⇑ Working with Database Objects in Oracle ... 2018-09-24, 3403🔥, 0💬

Create a Server Parameter File in Oracle
How To Create a Server Parameter File in Oracle? 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 file into a Server Parameter File (SPFile) using ... 2018-05-08, 3402🔥, 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, 3401🔥, 0💬

Categories of Data Types in Oracle
How Many Categories of Data Types in Oracle? Oracles supports the following categories of data types: Oracle Built-in Datatypes. ANSI, DB2, and SQL/DS Datatypes. User-Defined Types. Oracle-Supplied Types.   ⇒ Oracle Built-in Data Types in Oracle ⇐ What Is SQL Standard in Oracle ⇑ Understanding SQL ... 2020-05-29, 3397🔥, 0💬

Oracle Data File - Unit of Physical Storage in Oracle
What Is an Oracle Data File in Oracle? An Oracle data file is a big unit of physical storage in the OS file system. One or many Oracle data files are organized together to provide physical storage to a single Oracle tablespace.   ⇒ Relations between a Tablespace and Data Files in Oracle ⇐ Oracle Ta... 2019-01-20, 3396🔥, 0💬

Types of PL/SQL Code Blocks in Oracle
What Are the Types PL/SQL Code Blocks in Oracle? 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. It is similar to an anonymous b... 2018-10-30, 3396🔥, 0💬

Change User Password in Oracle
How To Change User Password in Oracle? If you want to change a user's password, you can log in as SYSTEM and use the ALTER USER command as shown in the following example: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter Connected. SQL&gt; ALTER USER DEV IDENTIFIED BY beginner; U... 2019-07-09, 3392🔥, 0💬

Start a Specific Oracle Instance in Oracle
How To Start a Specific Oracle Instance in Oracle? A simple way to start a specific Oracle instance is to start the instance with the PFILE option as shown in the following example: &gt;.\bin\sqlplus /nolog SQL&gt; CONNECT / AS SYSDBA Connected. SQL&gt; STARTUP NOMOUNT PFILE=$ORACLE_HOME... 2018-05-08, 3392🔥, 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, 3391🔥, 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, 3390🔥, 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, 3389🔥, 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, 3389🔥, 0💬

Set a READ ONLY Transaction in Oracle
How To Set a Transaction To Be READ ONLY in Oracle? If you want a transaction to be set as READ ONLY, you need to the transaction with the SET TRANSACTION READ ONLY statement. Note that a DML statement will start the transaction automatically. So you have to issue the SET TRANSACTION statement befor... 2019-08-19, 3388🔥, 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, 3388🔥, 0💬

Privilege to Insert Rows in Another Schema in Oracle
What Privilege Is Needed for a User to Insert Rows to Tables in Another Schema in Oracle? For a user to insert rows into tables of someone else's schema, he/she needs the INSERT ANY TABLE privilege. The following tutorial exercise gives you a good example of granting "dev" to insert rows in "hr" sch... 2019-06-11, 3386🔥, 0💬

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General MySQL Oracle SQL Server