General MySQL Oracle SQL Server

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Comments in SQL Server Transact-SQL Statements
How to enter comments in SQL Server Transact-SQL statements? There are 2 ways to enter comments within Transact-SQL statements: Starting comments with two dashes "--": Everything between "--" and the end of the line is treated as a comment. Entering comments between "/*" and "*/": Everything between... 2017-05-29, 2772🔥, 0💬

ICU_VERSION() - ICU (International Components for Unicode) Version
How to obtain the version number of the ICU (International Components for Unicode) library using the ICU_VERSION() function? ICU_VERSION() is a MySQL built-in function that returns the version number of the ICU (International Components for Unicode) library. For example: SELECT ICU_VERSION(); -- +--... 2025-04-11, 2770🔥, 0💬

What Is ODBC (Open Database Communication)?
What Is Open Database Communication (ODBC)? ODBC, Open Database Communication, a standard API (application program interface) developed by Microsoft for Windows applications to communicate with database management servers. If you want to access a database server through an ODBC driver from an applic... 2024-08-14, 2770🔥, 0💬

What Is BDB in MySQL
What Is BDB (BerkeleyDB) in MySQL? BDB (BerkeleyDB) is transaction safe storage engine originally developed at U.C. Berkeley. It is now developed by Sleepycat Software, Inc. (an Oracle company now).   ⇒ What Is CSV in MySQL ⇐ What Is InnoDB in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ ... 2017-07-03, 2770🔥, 0💬

Turn On and Off Recycle Bin for the Session in Oracle
How To Turn On or Off Recycle Bin for the Session in Oracle? If you want to control the recycle bin feature in your own session, you can use the ALTER SESSION statement to turn on or off. Here is an example SQL script: SQL&gt; connect HR/fyicenter Connected. SQL&gt; SELECT COUNT(*) FROM recy... 2019-05-10, 2769🔥, 0💬

Get System Date and Time in SQL Server Transact-SQL
How to get system date and time in SQL Server Transact-SQL? I want a list of functions for getting current system date and time. Here is a comparison of all functions that you can use to get the current date and time from the data base server system: Function Return type Precision ------------------... 2017-02-25, 2769🔥, 0💬

Categories of Data Types in PL/SQL in Oracle
How Many Categories of Data Types in Oracle? PL/SQL data types are grouped into 4 categories: Scalar Data Types: A scalar data type holds a single value. Composite Data Types: A composite data type has internal components, such as the elements of an array. LOB Data Types: A LOB data type holds a lob... 2018-11-17, 2768🔥, 0💬

Difference between CHAR and VARCHAR in MySQL
What Are the Differences between CHAR and VARCHAR in MySQL? CHAR and VARCHAR are both ASCII character data types by default. But they have the following major differences: CHAR stores values in fixed lengths. Values are padded with space characters to match the specified length. VARCHAR stores value... 2018-01-19, 2768🔥, 0💬

Attaching AdventureWorksLT Physical Files to the Server in SQL Server
How to attach AdventureWorksLT physical files to the server in SQL Server? After installed the sample database AdventureWorksLT, you need to attach it to your SQL server to make it available by follow this tutorial: EXEC sp_attach_db @dbname=N'AdventureWorksLT', @filename1=N'C:\Program Files\Microso... 2016-12-02, 2767🔥, 0💬

Tables Using BDB Storage Engine in MySQL
How To Create a New Table Using the BDB Storage Engine in MySQL? BDB (BerkeleyDB) storage engine was originally developed at U.C. Berkeley. It is now maintained by Sleepycat Software, Inc., which is an Oracle company now. BDB is transaction safe, and has been used in products from many companies, li... 2017-08-13, 2765🔥, 0💬

Create a New View in Oracle
How To Create a New View in Oracle? You can create a new view based on one or more existing tables by using the CREATE VIEW statement as shown in the following script: CREATE VIEW employee_department AS SELECT e.employee_id, e.first_name, e.last_name, e.email, e.manager_id, d.department_name FROM em... 2020-02-07, 2764🔥, 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, 2764🔥, 0💬

Using Wildcard Characters in LIKE Operations in SQL Server
How To Use Wildcard Characters in LIKE Operations in SQL Server Transact-SQL? Wildcard character '%' can be used in the pattern string for the LIKE operator to match any string of zero or more characters. The following example uses '%Sport% Store' to search all company names that has a partial word ... 2017-01-21, 2763🔥, 0💬

Mixing Group Functions with Non-group Selection Fields in SQL Server
Can Group Functions Be Mixed with Non-group Selection Fields in SQL Server? 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 inva... 2016-10-25, 2762🔥, 0💬

Original Export/Import Utilities in Oracle
What Are the Original Export and Import Utilities in Oracle? Oracle original Export and Import utilities are standalone programs that provide you a simple way for you to transfer data objects between Oracle databases, even if they reside on platforms with different hardware and software configuratio... 2016-10-15, 2762🔥, 0💬

Incrementing a Date by 1 in MySQL
How To Increment Dates by 1 in MySQL? If you have a date, and you want to increment it by 1 day, you can use the DATE_ADD(date, INTERVAL 1 DAY) function. You can also use the date interval add operation as "date + INTERVAL 1 DAY". The tutorial exercise below gives you some good examples: SELECT DATE... 2017-12-26, 2761🔥, 0💬

"mysqld" Command Line Options in MySQL
What Are the "mysqld" Command Line Options in MySQL? "mysqld" offers a big list of command line options. Here are some commonly used options: "--help" - Displays a short help message on how to use "mysqld". "--verbose --help" - Displays a long help messages on how to use "mysqld". "--console" - Spec... 2017-12-04, 2761🔥, 0💬

"INSERT" and "UPDATE" Statements - Inserting and Updating Data In Tables in SQL Server
How to insert and update data into a table with "INSERT" and "UPDATE" statements in SQL Server? This is the third 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 ... 2016-12-02, 2760🔥, 0💬

Systems Supported by 10g XE Server in Oracle
What Operating Systems Are Supported by Oracle Database 10g XE in Oracle? Oracle Database 10g Express Edition is available for two types of operating Systems: Linux x86 - Debian, Mandriva, Novell, Red Hat and Ubuntu Microsoft Windows   ⇒ Download Oracle Database 10g XE in Oracle ⇐ Limitations of Or... 2020-05-05, 2759🔥, 0💬

Understanding SQL DDL Statements for Oracle
Where to find answers to frequently asked questions on SQL DDL Statements for Oracle? I want to start creating tables. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on SQL DDL Statements for Oracle. Clear answers are provided with tutorial exercise... 2020-02-29, 2759🔥, 0💬

"ALTER LOGIN" - Changing the Password of a Login Name in SQL Server
How To Change the Password of a Login Name in SQL Server? If a developer lost the password of his or her login name, you can reset the password with the "ALTER LOGIN" statement as shown in this tutorial example: -- Login with sa ALTER LOGIN FYI_DBA WITH PASSWORD = 'fyicenter'; GO Command(s) complete... 2016-10-20, 2759🔥, 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, 2758🔥, 0💬

Adding and Removing Days on Date and Time Values in SQL Server
How To Add or Remove Days on Date and Time Values in SQL Server Transact-SQL? SQL Server 2005 only support two operators on data and time values: + (Add): Adding days to a date and time value. - (Subtract): Removing days from a date and time value. Note that to add or subtract days on a date and tim... 2017-02-22, 2757🔥, 0💬

Define a Cursor Variable in Oracle
How To Define a Cursor Variable in Oracle? To define cursor variable, you must decide which REF CURSOR data type to use. There are 3 ways to select a REF CURSOR data type: Define your own specific REF CURSOR types using the TYPE ... RETURN statement. Define your own generic REF CURSOR type using the... 2018-07-18, 2755🔥, 0💬

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General MySQL Oracle SQL Server