General MySQL Oracle SQL Server

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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, 2762🔥, 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, 2762🔥, 0💬

User Privilege Tables in MySQL
Where Are User Privileges Stored on the Server in MySQL? MySQL server has a system database, which hosts a number of system tables to system related information like user privileges. Depending on the scope levels, granted user privileges are stored in different tables: "mysql.user" - Stores privileg... 2017-12-09, 2762🔥, 0💬

Variables and Data Types in SQL Server Transact-SQL
Where to find answers to frequently asked questions on variables and data types in Microsoft SQL Server Transact-SQL? I am new to Transact-SQL and SQL Server. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com team on variables and data types in Microsoft SQL Se... 2017-04-22, 2761🔥, 0💬

Use LIKE Conditions in Oracle
How To Use LIKE Conditions in Oracle? LIKE condition is also called pattern patch. There 3 main rules on using LIKE condition: '_' is used in the pattern to match any one character. '%' is used in the pattern to match any zero or more characters. ESCAPE clause is used to provide the escape character... 2020-03-15, 2758🔥, 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, 2756🔥, 0💬

What Is a Directory Object in Oracle
What Is a Directory Object in Oracle? A directory object is a logical alias for a physical directory path name on the operating system. Directory objects can be created, dropped, and granted access permissions to different users. The following tutorial exercise shows you some good examples: &gt;... 2016-10-15, 2756🔥, 0💬

Transaction Rollback When Session Killed in Oracle
What Happens to the Current Transaction If the Session Is Killed in Oracle? 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 removed. This is called an implicit rollback when ses... 2019-08-23, 2755🔥, 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, 2755🔥, 0💬

Difference between CHAR and NCHAR in MySQL
What Are the Differences between CHAR and NCHAR in MySQL? Both CHAR and NCHAR are fixed length string data types. But they have the following differences: CHAR's full name is CHARACTER. NCHAR's full name is NATIONAL CHARACTER. By default, CHAR uses ASCII character set. So 1 character is always store... 2018-01-19, 2755🔥, 0💬

Connecting to MySQL Server on a Specific Port in MySQL
How To Connect to MySQL Server on a Different Port in MySQL? If your MySQL server is listening on port number different than 3306, you need to specify "--port=portNumber" option to any client program that needs to connect to the server. The tutorial exercise shows you how to connect "mysql" to start... 2017-11-25, 2755🔥, 0💬

Finding the Login Name Linked to a Given User Name in SQL Server
How To Find the Login Name Linked to a Given User Name in SQL Server? If you know a user name in a database and you want to find out which login name is linked this user name, you need to check the Security ID (SID) of the user name based on the following rules: Each login name is associated a uniqu... 2017-08-25, 2755🔥, 0💬

What Is a Statement in SQL Server Transact-SQL
What is a statement in SQL Server Transact-SQL? A statement in SQL Server Transact-SQL is a single smallest execution unit. Here are some examples of Transact-SQL statements: "PRINT 'Hello World!';" - An output statement that print a character string to the console. "SELECT GETDATE();" - A query sta... 2017-05-29, 2755🔥, 0💬

"CREATE DATABASE" Statement - Creating New Databases in SQL Server
How to create new databases with "CREATE DATABASE" statements in SQL Server? This is the first tutorial of a quick lesson on creating database objects with Transact-SQL statements. This lesson shows you how to create a database, create a table in the database, and then access and change the data in ... 2016-12-02, 2750🔥, 0💬

MySQL Functions for Encryption and Compression
Where to find reference information and tutorials on MySQL database functions for Encryption and Compression? I want to know how to use COMPRESS(), ENCRYPT() and other related functions. Here is a collection of reference information and tutorials on MySQL database functions for Encryption and Compre... 2025-03-12, 2749🔥, 0💬

SQL Server TCP/IP Connection Info
What information is needed for a client tool or application to connect to a SQL Server database using the TCP/IP protocol? In order to connect to a SQL Server database using the TCP/IP protocol, you need to know the following information: 1. Host Name - The name of the hosting computer where the SQL... 2024-08-14, 2749🔥, 0💬

"@@FETCH_STATUS" - Looping through Result Set in SQL Server
How To Loop through the Result Set with @@FETCH_STATUS in SQL Server Transact-SQL? The FETCH statement only returns one row from the result set. If you want to return all rows, you need to put the FETCH statement in a loop. A simple way to stop the loop to check the system variable @@FETCH_STATUS, w... 2016-10-17, 2749🔥, 0💬

Turn on and off Autocommit in MySQL
How To Switch between Autocommit-On and Autocommit-Off Modes in MySQL? By default, your connection session will be in Autocommit-On mode, where every server executable statement will start a new transaction, and end the transaction when the execution ends. Changes will be committed. So consider this... 2016-10-17, 2749🔥, 0💬

COLLATE Clause in SQL Server Transact-SQL
How To Specify the Collation for a Character Data Type in SQL Server Transact-SQL? If you do not want to use the default collation provided by the SQL Server, you can use the "COLLATE collation_name" clause to specify a different collation to be used at different levels: Database Level - Used in CRE... 2017-05-13, 2747🔥, 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, 2746🔥, 0💬

Entering Binary String Literals in SQL Server Transact-SQL
How To Enter Binary String Literals in SQL Server Transact-SQL? Binary string long values are normally generated by client applications by reading input channels, like image files. But sometimes, you may need to enter some short binary strings as literals. Binary string literals are entered as a str... 2017-04-22, 2740🔥, 0💬

"sp_columns" - Getting a List of Columns in a Table in SQL Server
How To Get a List of Columns using the "sp_columns" Stored Procedure in SQL Server? If you have an existing table, but you don't remember what are the columns defined in the table, you can use the "sp_columns" stored procedure to get a list of all columns of the specified table. The following tutori... 2016-11-17, 2740🔥, 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, 2739🔥, 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, 2738🔥, 0💬

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General MySQL Oracle SQL Server