General MySQL Oracle SQL Server

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CAST() - Converting Numeric Expression Data Types in SQL Server
How To Convert Numeric Expression Data Types using the CAST() Function in SQL Server Transact-SQL? If you want to convert the data type of a numeric expression to a new data type, you can use the CAST(expression AS data_type) function. The tutorial exercise below shows you how to use the CAST() func... 2017-03-27, 4595🔥, 0💬

UPDATE Subquery Returning Multiple Rows in SQL Server
What Happens If the UPDATE Subquery Returns Multiple Rows in SQL Server? If a subquery is used in a UPDATE statement, it must return exactly one row for each row in the update table that matches the WHERE clause. If it returns multiple rows, SQL Server will give you an error message. To test this ou... 2016-11-02, 4594🔥, 0💬

INSERT, UPDATE and DELETE Statements in MySQL
Where to find answers to frequently asked questions on INSERT, UPDATE and DELETE Statements in MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on INSERT, UPDATE and DELETE Statements in MySQL. Clear answers are provided with tutorial exercises... 2018-01-24, 4572🔥, 0💬

Updating Multiple Rows with One UPDATE Statement in SQL Server
How To Update Multiple Rows with One UPDATE Statement in SQL Server? If the WHERE clause in an UPDATE statement matches multiple rows, the SET clause will be applied to all matched rows. This rule allows you to update values on multiple rows in a single UPDATE statement. Here is a good example: SELE... 2016-11-02, 4562🔥, 0💬

What Is Program Global Area (PGA) in Oracle
What Is Program Global Area (PGA) in Oracle? A Program Global Area (PGA) is a memory buffer that is allocated for each individual database session and it contains session specific information such as SQL statement data or buffers used for sorting. The value specifies the total memory allocated by al... 2020-07-07, 4560🔥, 0💬

What Is SQL Server Transact-SQL (T-SQL)?
What is SQL Server Transact-SQL (T-SQL)? SQL Server Transact-SQL, also called T-SQL, is an extension of the standard SQL (Structured Query Language). Transact-SQL was developed by Microsoft and Sybase. Microsoft's implementation ships in the Microsoft SQL Server product. Sybase uses the language in ... 2017-06-16, 4557🔥, 0💬

StartDB.bat Failed to Start the XE Instance in Oracle
What To Do If the StartDB.bat Failed to Start the XE Instance in Oracle? If StartDB.bat failed to start the XE instance, you need to try to start the instance with other approaches to get detail error messages on why the instance can not be started. One good approach to start the default instance is... 2020-09-30, 4555🔥, 0💬

"ALTER TABLE ... ALTER COLUMN" - Changing Column Data Type in SQL Server
How to change the data type of an existing column with "ALTER TABLE" statements in SQL Server? Sometimes, you may need to change the data type of an existing column. For example, you want increase the string length of a column. You can use the "ALTER TABLE ... ALTER COLUMN" statements in the followi... 2016-11-15, 4542🔥, 0💬

Getting Year, Month and Day Out of DATETIME Values in SQL Server
How To Get Year, Month and Day Out of DATETIME Values in SQL Server Transact-SQL? You can use DATEPART() to get any part of the DATETIME value. But to get year, month and day, you can use 3 specific functions: YEAR(), MONTH() and DAY(). These functions are equivalent to DATEPART() as: YEAR(date) = D... 2017-02-14, 4536🔥, 0💬

GO - Sending a Statement Batch from "sqlcmd" in SQL Server
How To Use GO Command in "sqlcmd" in SQL Server? "sqlcmd" is a command line client application to run Transact-SQL statements on a target SQL Server. When "sqlcmd" is started and connected to a SQL Server, it will start a new batch and prompt you to enter the first statement of the batch. You can en... 2016-12-04, 4523🔥, 0💬

"USE" - Setting the Current Database in SQL Server
How to set the current database in SQL Server? Once you are connected to the SQL Server, you should select a database to work with and set it as the current database using the "USE" statement with this syntax: USE database_name The following tutorial example shows you how to set "FyiCenterData" as t... 2016-11-24, 4519🔥, 0💬

Error: Cannot Drop Index on Primary Key in Oracle
Can You Drop an Index Associated with a Unique or Primary Key Constraint in Oracle? You can not delete the index associated with a unique or primary key constraint. If you try, you will get an error like this: ORA-02429: cannot drop index used for enforcement of unique/primary key.   ⇒ Dropped Table... 2023-05-09, 4518🔥, 1💬

💬 2023-05-09 Shivank: Correct answer is 5

CONVERT() - Converting Character Strings to Numeric Values in SQL Server
How To Convert Character Strings into Numeric Values in SQL Server Transact-SQL? Sometimes you need to convert numeric values enclosed in character strings back to numeric values by using the CONVERT() function. When converting character strings to values with CONVERT(), you need to remember two rul... 2017-03-22, 4493🔥, 0💬

Converting Numeric Values to Character Strings in MySQL
How To Convert Numeric Values to Character Strings in MySQL? You can convert numeric values to character strings by using the CAST(value AS CHAR) function as shown in the following examples: SELECT CAST(4123.45700 AS CHAR) FROM DUAL; 4123.45700 -- How to get rid of the last 2 '0's? SELECT CAST(4.123... 2018-03-28, 4492🔥, 0💬

Is SQL Server Transact-SQL Case Sensitive?
Is SQL Server Transact-SQL case sensitive? No. Transact-SQL is not case sensitive. Like the standard SQL, you can type in your Transact-SQL statement in upper case or lower case. However, you should use upper case for all key words in Transact-SQL statements as a best practice. The following example... 2017-06-16, 4492🔥, 0💬

Install Oracle Database 10g XE in Oracle
How To Install Oracle Database 10g XE in Oracle? To install 10g universal edition, double click, OracleXEUniv.exe, the install wizard starts. It will guide you to finish the installation process. You should take notes about: The SYSTEM password you selected: fyicenter. Database server port: 1521. Da... 2024-05-01, 4486🔥, 1💬

PHP Connections and Query Execution for MySQL
Where to find answers to frequently asked questions on PHP Connections and Query Execution for MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on PHP Connections and Query Execution in MySQL. Clear explanations and tutorial exercises are provi... 2017-11-25, 4482🔥, 0💬

Generating CREATE VIEW Scripts on Existing Views in SQL Server
How To Generate CREATE VIEW Script on an Existing View in SQL Server? If you want to know how an existing view was created, you can use SQL Server Management Studio to automatically generate a "CREATE VIEW" script The following tutorial shows you how to do this: 1. Run SQL Server Management Studio a... 2016-11-05, 4478🔥, 0💬

IF ... ELSE Statement in SQL Server Transact-SQL
How to execute statements under given conditions in SQL Server Transact-SQL? How to use IF ... ELSE statements? You can use IF ... ELSE statements to execute statements under given conditions in Transact-SQL using these syntaxes: IF condition statement_1 IF condition statement_1 ELSE statement_2 IF ... 2017-01-11, 4470🔥, 0💬

"sys.tables" - Getting a List of All Tables in SQL Server
How To Get a List of All Tables with "sys.tables" View in SQL Server? If you want to see the table you have just created, you can use the "sys.tables" system view to get a list of all tables in the current database. The tutorial script gives you a good example: SELECT name, type_desc, create_date FR... 2018-03-29, 4461🔥, 1💬

💬 2018-03-29 Eric: That works. Thanks!

DATEDIFF() - Calculating DATETIME Value Differences in SQL Server
How To Calculate DATETIME Value Differences Using the DATEDIFF() Function in SQL Server Transact-SQL? If you want to calculate the difference between two date and time values, you can use the DATEDIFF() function in the following format: DATEDIFF(datepart, startdate, enddate) returns INT: "startdate"... 2017-02-20, 4461🔥, 0💬

Generating CREATE TABLE Script on Existing Tables in SQL Server
How To Generate CREATE TABLE Script on an Existing Table in SQL Server? If you want to know how an existing table was created, you can use SQL Server Management Studio to automatically generate a "CREATE TABLE" script The following tutorial shows you how to do this: 1. Run SQL Server Management Stud... 2016-11-17, 4449🔥, 0💬

CREATE, ALTER and DROP Statements in MySQL
Where to find answers to frequently asked questions on CREATE, ALTER and DROP Statements in MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on CREATE, ALTER and DROP Statements in MySQL. Clear answers are provided with tutorial exercises on cr... 2018-03-13, 4441🔥, 0💬

What Is an Oracle Tablespace in Oracle
What Is an Oracle Tablespace in Oracle? An Oracle tablespace is a big unit of logical storage in an Oracle database. It is managed and used by the Oracle server to store structures data objects, like tables and indexes. Each tablespace in an Oracle database consists of one or more files called dataf... 2020-10-26, 4440🔥, 1💬

💬 2018-10-15 taj mure: Nicerere

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General MySQL Oracle SQL Server