General MySQL Oracle SQL Server

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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, 5846🔥, 1💬

Select All Columns of All Rows in Oracle
How To Select All Columns of All Rows from a Table in Oracle? The simplest query statement is the one that selects all columns of all rows from a table: "SELECT * FROM table_name;". The (*) in the SELECT clause tells the query to return all columns. The tutorial exercise below gives you a good examp... 2019-12-19, 5842🔥, 0💬

PRINT Statements in SQL Server Transact-SQL
How to print value on console in SQL Server Transact-SQL? How to use the PRINT statements? In Transact-SQL, you can use PRINT statements to print values on the console of the client tool, in the syntax of: PRINT &lt;value&gt; When a PRINT statement is executed, the system will: Print the val... 2017-04-01, 5813🔥, 0💬

CREATE INDEX - Create a Table Index in Oracle
How To Create a Table Index in Oracle? If you have a table with a lots of rows, and you know that one of the columns will be used often a search criteria, you can add an index for that column to in improve the search performance. To add an index, you can use the CREATE INDEX statement as shown in th... 2020-02-20, 5804🔥, 0💬

Difference between BINARY and VARBINARY in MySQL
What Are the Differences between BINARY and VARBINARY in MySQL? Both BINARY and VARBINARY are both binary byte data types. But they have the following major differences: BINARY stores values in fixed lengths. Values are padded with 0x00. VARBINARY stores values in variable lengths. Values are not pa... 2018-01-19, 5795🔥, 0💬

Basic Features of a Trigger in SQL Server
What Are the Basic Features of a Trigger in SQL Server? Since a SQL Server trigger is a really an event handler, it has the following basic features similar to event handlers in other programming languages: Event Type - It must be declared to handle a specific event, like a DELETE event. Object Scop... 2016-10-25, 5787🔥, 0💬

Single-Byte Character Data Types in SQL Server Transact-SQL
What are single-byte character string data types supported in SQL Server Transact-SQL? Single-byte character string data types are used to hold single-byte character strings. There are 3 single-byte character string data types supported in SQL Server Transact-SQL: 1. CHAR (or CHARACTER) - Used to ho... 2017-04-08, 5750🔥, 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, 5742🔥, 1💬

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

Date and Time Functions in MySQL
What Are Date and Time Functions in MySQL? MySQL offers a number of functions for date and time values: ADDDATE(date, INTERVAL expr unit) - Adding days to a date. Same as DATE_ADD(). ADDTIME(time1, time2) - Adding two time values together. CURDATE() - Returning the current date. Same as CURRENT_DATE... 2018-03-13, 5736🔥, 0💬

What Is a Parameter File in Oracle
What Is a Parameter File in Oracle? A parameter file is a file that contains a list of initialization parameters and a value for each parameter. You specify initialization parameters in a parameter file that reflect your particular installation. Oracle supports the following two types of parameter f... 2020-11-11, 5735🔥, 1💬

💬 2016-12-04 mm: mm

READ_ONLY/READ_WRITE - Database Update Options in SQL Server
How to set database to be READ_ONLY in SQL Server? Databases in SQL Server have two update options: READ_WRITE - Data objects are allowed to be queried and modified. This is the default. READ_ONLY - Data objects are allowed to be queried, but not allowed to be modified. You can use the "ALTER DATABA... 2016-11-20, 5735🔥, 0💬

Drop an Index in Oracle
How To Drop an Index in Oracle? If you don't need an existing index any more, you should delete it with the DROP INDEX statement. Here is an example SQL script: CREATE TABLE student (id NUMBER(5) PRIMARY KEY, first_name VARCHAR(80) NOT NULL, last_name VARCHAR(80) NOT NULL, birth_date DATE NOT NULL, ... 2019-04-22, 5704🔥, 0💬

Conditional Statements and Loops in SQL Server in SQL Server Transact-SQL
Where to find answers to frequently asked questions on Conditional Statements and Loops in SQL Server Transact-SQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com team on Conditional Statements and Loops in SQL Server Transact-SQL. Clear answers are provided... 2017-01-11, 5698🔥, 0💬

Downloading and Installing SQL Server Management Studio Express in SQL Server
How to download and install Microsoft SQL Server Management Studio Express in SQL Server? Microsoft SQL Server Management Studio Express (SSMSE) is a free, easy-to-use graphical management tool for managing SQL Server 2005 Express Edition and SQL Server 2005 Express Edition with Advanced Services. I... 2016-12-04, 5693🔥, 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, 5691🔥, 0💬

Transaction Committed when START TRANSACTION Executed in MySQL
What Happens to the Current Transaction If a START TRANSACTION Is Executed in MySQL? If you are in a middle of a current transaction, and a START TRANSACTION command is executed, the current transaction will be committed and ended. All the database changes made in the current transaction will become... 2016-10-17, 5691🔥, 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, 5633🔥, 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, 5628🔥, 0💬

FORMAT_BYTES() - Formatting Bytes in Readable Units
How to format a number of bytes in a human-readable unit using the FORMAT_BYTES() function? FORMAT_BYTES(con) is a MySQL built-in function that converts a number of bytes in a human-readable unit of KiB, MiG, GiB, TiB, PiB or EiB. For example: SELECT FORMAT_BYTES(9), FORMAT_BYTES(9*1024), FORMAT_BYT... 2025-09-24, 5618🔥, 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, 5616🔥, 0💬

Counting Rows with the COUNT(*) Function in SQL Server
How To Count Rows with the COUNT(*) Function in SQL Server? If you want to count the number of rows, you can use the COUNT(*) function in the SELECT clause. The following tutorial exercise shows you some good examples: SELECT COUNT(*) FROM fyi_links GO 7 SELECT COUNT(*) FROM fyi_links WHERE url LIKE... 2016-10-26, 5609🔥, 0💬

JSON_UNQUOTE() - Unquoting JSON String
How to convert a JSON (JavaScript Object Notation) quoted string into a regular character string using the JSON_UNQUOTE() function? JSON_UNQUOTE(json) is a MySQL built-in function that converts a JSON string into a regular character string, by removing the enclosing double-quotes and restoring any e... 2025-03-12, 5593🔥, 0💬

Running Queries with SQL Server Management Studio Express in SQL Server
How to run Queries with SQL Server Management Studio Express in SQL Server? 1. Launch and connect SQL Server Management Studio Express to the local SQL Server 2005 Express. 2. Click on the "New Query" button below the menu line. Enter the following SQL statement in the query window: SELECT 'Welcome ... 2016-12-04, 5591🔥, 0💬

SQL*Plus Commands Stored in a File in Oracle
How Run SQL*Plus Commands That Are Stored in a Local File in Oracle? If you have a group of commands that you need to run them repeatedly every day, you can save those commands in a file (called SQL script file), and using the "@fileName" command to run them in SQL*Plus. If you want to try this, cre... 2020-06-08, 5587🔥, 0💬

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General MySQL Oracle SQL Server