General MySQL Oracle SQL Server

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What Is Index Fragmentation in SQL Server
What Is Index Fragmentation in SQL Server? Index fragmentation is a phenomena where index contents are no longer stored continuously in the storage. When index contents become scattered in the storage, fragmented, performance on index will degrade. If you want to see the fragmentation level of an in... 2016-11-08, 1528🔥, 0💬

Numeric Expressions and Functions in SQL Server Transact-SQL
Where to find answers to frequently asked questions on Numeric Expressions and Functions in SQL Server Transact-SQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Numeric Expressions and Functions in SQL Server Transact-SQL. Clear answers are pr... 2017-04-01, 1527🔥, 0💬

What Are NULL Values in SQL Server
What Are NULL Values in SQL Server Transact-SQL? A NULL value is a special value that represents an unknown value. SQL Server supports NULL values with the following features: All data types used for table columns support NULL values. In another word, NULL values can be stored in database tables. In... 2017-02-05, 1524🔥, 0💬

Character String Functions Supported by SQL Server 2005 in SQL Server
What Are the Character String Functions Supported by SQL Server 2005 in SQL Server Transact-SQL? SQL Server 2005 supports 23 character string functions: ASCII(char) - Returning the code value of a non-Unicode character. CHAR(int) - Returning the non-Unicode character of a code value. CHARINDEX(word,... 2017-03-07, 1520🔥, 0💬

Concatenating Two Character Strings in SQL Server
How To Concatenate Two Character Strings Together in SQL Server Transact-SQL? Concatenating two character strings together is most commonly used string operation. SQL Server 2005 allows to concatenate two character strings into a single string with the (+) operator. The following tutorial exercise s... 2017-03-11, 1515🔥, 0💬

Using SELECT Statements and GROUP BY Clauses in SQL Server
Where to find answers to frequently asked questions on Using SELECT Statements and GROUP BY Clauses in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Using SELECT Statements and GROUP BY Clauses in SQL Server. Clear answers are provid... 2016-10-26, 1515🔥, 0💬

SET Statements in SQL Server Transact-SQL
How to assign value to a variable in SQL Server Transact-SQL? How to use the SET statements? In Transact-SQL, you can use SET statements to assign values to variables using the assignment operator =, in the syntax of: SET @variable = &lt;value&gt; When an SET statement is executed, the syste... 2017-04-04, 1513🔥, 0💬

Understanding and Managing Indexes in SQL Server
Where to find answers to frequently asked questions on Understanding and Managing Indexes in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Understanding and Managing Indexes in SQL Server. Clear answers are provided with tutorial exe... 2016-11-15, 1508🔥, 0💬

Differences between Functions and Stored Procedures in SQL Server
What Are the Differences between User Defined Functions and Stored Procedures in SQL Server Transact-SQL? Differences between user defined functions and stored procedures are: Stored procedures does not return any data and they can not be used in expressions. User defined functions does return data ... 2016-12-24, 1505🔥, 0💬

CREATE INDEX - Impact on Other User Sessions in SQL Server
What Is the Impact on Other User Sessions When Creating Indexes in SQL Server? If you are creating a new index on a table with existing data, all existing rows will be indexed as part of the CREATE INDEX statement. If the table is large, the indexing process could take some time. The impact of this ... 2016-11-08, 1505🔥, 0💬

Converting Numeric Data Types by Assignment Operations in SQL Server
How To Convert Numeric Expression Data Types by Assignment Operations in SQL Server Transact-SQL? An assignment operation is used to assign an expression to a variable, a column, or a parameter. If the data type of the expression does not match the data type of the receiving variable, column, or par... 2017-03-27, 1504🔥, 0💬

Mathematical Functions Supported by SQL Server 2005 in SQL Server
What Are the Mathematical Functions Supported by SQL Server 2005 in SQL Server Transact-SQL? SQL Server 2005 supports 23 mathematical functions: ABS, ACOS, ASIN, ATAN, ATN2, CEILING, COS, COT, DEGREES, EXP, FLOOR, LOG, LOG10, PI, POWER, RADIANS, RAND, ROUND, SIGN, SIN, SQRT, SQUARE, and TAN. The ret... 2017-03-22, 1502🔥, 0💬

Concatenating Two Binary Strings in SQL Server
How To Concatenate Two Binary Strings Together in SQL Server Transact-SQL? SQL Server 2005 allows to concatenate two binary strings into a single string with the (+) operator. The following tutorial exercise shows you some binary string concatenation examples: -- Concatenating two binary string lite... 2017-03-07, 1500🔥, 0💬

Index Speeding Up SELECT Statements in SQL Server
Does Index Speed Up SELECT Statements in SQL Server? If you want to see the impact of indexes on SELECT statements, you can run the same SELECT statement on "fyi_links" and "fyi_links_indexed" tables. See the tutorial exercise below: USE FyiCenterData; GO -- Run SELECT on the table without indexes D... 2016-11-13, 1496🔥, 0💬

Converting Integers into Date and Time Values in SQL Server
Can Integers Be Converted into Date and Time Values in SQL Server Transact-SQL? Can integers be converted into date and time values? The answer is yes. The input integer will be used as the number of days relative to the base date: Jan 1, 1900. The time of the day will be set to 0, midnight of the d... 2017-02-22, 1495🔥, 0💬

"CREATE TRIGGER" - Creating a DDL Trigger in SQL Server
How To Create a DDL Trigger using "CREATE TRIGGER" Statements in SQL Server? A DDL trigger is defined to handle a DDL statement event, like create, alter and drop tables, views, indexes, etc. DDL triggers can be used to generate warning messages on database object changes. The format of creating a D... 2016-10-22, 1495🔥, 0💬

ALTER VIEW - Modifying Existing Views in SQL Server
How To Modify the Underlying Query of an Existing View in SQL Server? If you have an existing view, and want to change the underlying SELECT statement, you can use the "ALTER VIEW ..." statement to redefine the view. The tutorial exercise below shows you how modify an existing view: USE FyiCenterDat... 2016-11-04, 1491🔥, 0💬

"ALTER LOGIN" - Changing a Login Name in SQL Server
How To Change a Login Name in SQL Server? If you want to change a login name, you can use the "ALTER LOGIN" statement as shown in this tutorial example: -- Login with "sa" -- Change login name ALTER LOGIN Fyi_Login WITH NAME = Dba_Login; GO -- View login names SELECT name, sid, type, type_desc FROM ... 2016-10-19, 1490🔥, 0💬

Understanding and Managing Views in SQL Server
Where to find answers to frequently asked questions on Understanding and Managing Views in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Understanding and Managing Views in SQL Server. Clear answers are provided with tutorial exercis... 2016-11-08, 1489🔥, 0💬

Converting Numeric Expressions from One Data Type to Another in SQL Server
How To Convert a Numeric Expression from One Data Type to Another in SQL Server Transact-SQL? There are 4 ways to convert a numeric expression from one data type to another data type: Implicit conversion by arithmetic operations - When arithmetic operations are performed on expressions of different ... 2017-03-27, 1485🔥, 0💬

Arithmetic Operations with Different Data Types in SQL Server
What Happens to an Arithmetic Operation with Two Different Data Types in SQL Server Transact-SQL? When two expressions with different data types are put together for an arithmetic operation, the expression with a lower rank data type will be converted automatically to higher rank data type. Usually,... 2017-03-27, 1484🔥, 0💬

Using Cursors in SQL Server Transact-SQL
Where to find answers to frequently asked questions on Using Cursors in SQL Server Transact-SQL? I want to loop through rows in a result set. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Using Cursors in SQL Server Transact-SQL. Clear explanati... 2016-10-17, 1484🔥, 0💬

Moving Database Physical Files to New Locations in SQL Server
How to move database physical files in SQL Server? If you want to move database physical files to a new location, you can use the "ALTER DATABASE" statements to bring the database offline, and link it to the files at the new location. The following tutorial gives you a good example: ALTER DATABASE F... 2016-11-20, 1483🔥, 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, 1481🔥, 0💬

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General MySQL Oracle SQL Server