General MySQL Oracle SQL Server

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Show Installed Oracle ODBC Drivers in Oracle
How To Find Out What Oracle ODBC Drivers Are Installed in Oracle? To find out what Oracle ODBC drivers are installed on your Windows system, you can use the ODBC manager to look at them: Go to Control Panel. Go to Administrative Tools. Run Data Sources (ODBC). Go to System DSN tab. Click the Add but... 2016-10-15, 2791🔥, 0💬

Date/Time Data Type Comparison in SQL Server Transact-SQL
What are differences between date and time data types in SQL Server Transact-SQL? I want to compare of date and time data types? Here is a comparison table of all date and time data types supported in SQL Server Transact-SQL: Data type Storage size Precision Default Format / (bytes) Value range ----... 2017-02-25, 2790🔥, 0💬

Query with a Full Outer Join in Oracle
How To Write a Query with a Full Outer Join in Oracle? If you want to query from two tables with a full outer join, you can use the FULL OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a full outer join from two tables: departments and employees. The join conditi... 2019-10-18, 2788🔥, 0💬

File Formats Supported on Export Data in Oracle
How Many File Formats Are Supported to Export Data in Oracle? Oracle SQL Developer can allow to export table data into files in the following formats: TXT - Tab delimited fields file format. CSV - Comma Separated Values (CSV) file format. LOADER - File format used by SQL*Loader. XML - XML file forma... 2019-01-26, 2788🔥, 0💬

What Is MySQL
What Is MySQL? MySQL is an open source database management system developed by MySQL AB, http://www.mysql.com.   ⇒ What Is mSQL in MySQL ⇐ Database Basics and Terminologies in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ MySQL Database Tutorials 2017-07-21, 2788🔥, 0💬

"CREATE USER" Statements - Creating a User in SQL Server
How to create a user to access a database using "CREATE USER" statements in SQL Server? This is the second tutorial of a quick lesson on creating login and configure users for databases with Transact-SQL statements. Granting a user access to a database involves three steps. First, you create a login... 2016-11-27, 2788🔥, 0💬

Commonly Used MSSQL Functions in PHP
What Are Commonly Used MSSQL Functions in PHP? If you look at the PHP 5 manual, you will see a group of functions listed under the Microsoft SQL Server Functions section. The commonly used functions are: mssql_connect � Open MS SQL server connection mssql_close � Close MS SQL Server connection mssql... 2024-04-07, 2787🔥, 0💬

Query with an Inner Join in Oracle
How To Write a Query with an Inner Join in Oracle? If you want to query from two tables with an inner join, you can use the INNER JOIN ... ON clause in the FROM clause. The following query returns output with an inner join from two tables: employees and departments. The join condition is that the de... 2019-10-27, 2787🔥, 0💬

Date and Time Intervals in MySQL
What Are Date and Time Intervals in MySQL? A date and time interval is special value to be used to increment or decrement a date or a time at a given date or time unit. A data and time interval should be expression in the format of "INTERVAL expression unit", where "unit" and "expression" should fol... 2017-12-26, 2786🔥, 0💬

What Is a Cursor in Oracle
What Is a Cursor in Oracle? A cursor looks like a variable, but it is not a variable. A cursor looks like a procedure, but it is not a procedure. A cursor is a cursor. It is a logical representation of a resource connects to a set of data rows related to a DML statement. A cursor is consists of: A D... 2018-02-01, 2785🔥, 0💬

What Is a Data Lock in MySQL
What Is a Data Lock in MySQL? MySQL uses two types of data locks at two levels to provide you the transaction isolation level you need: Share Lock at Row Level (S) - A data row is locked by a transaction for reading. Exclusive Lock at Row Level (X) - A data row is locked by a transaction for updatin... 2017-04-28, 2785🔥, 0💬

Exact Numeric Data Types in SQL Server Transact-SQL
What are exact numeric data types supported in SQL Server Transact-SQL? Exact numeric data types are used to hold numeric values truncated to a specific precision and scale. There are 8 different exact numeric data types supported in SQL Server Transact-SQL: 1. BIGINT - Used to hold big integers wit... 2017-04-22, 2785🔥, 0💬

Data Pump Export Utility in Oracle
What Is the Data Pump Export Utility in Oracle? Oracle Data Pump Export utility is a standalone programs that allows you to export data objects from Oracle database to operating system files called dump file set, which can be imported back to Oracle database only by Oracle Data Pump Import utility. ... 2016-10-15, 2785🔥, 0💬

Execute a Stored Procedure in Oracle
How To Execute a Stored Procedure in Oracle? If you want to execute a stored procedure, you can use the EXECUTE statement. The example script below shows how to executes a stored procedure: SQL&gt; set serveroutput on; SQL&gt; CREATE PROCEDURE Greeting AS 2 BEGIN 3 DBMS_OUTPUT.PUT_LINE('Welc... 2018-11-11, 2783🔥, 0💬

How Oracle Handles Dead Locks in Oracle
How Oracle Handles Dead Locks in Oracle? Oracle server automatically detects dead locks. When a dead lock is detected, Oracle server will select a victim transaction, and fail its statement that is blocked in the dead lock to break the dead lock. The tutorial exercise below shows you an example of s... 2019-08-08, 2782🔥, 0💬

Single-byte String Literals in SQL Server Transact-SQL
What are single-byte string literals supported in SQL Server Transact-SQL? Single-byte string literals in Transact-SQL are sequences of characters enclosed in single quotes. String literals are used to provide values to string variables or table columns like CHAR(40), VARCHAR(40), etc. String litera... 2017-05-20, 2781🔥, 0💬

Creating New Database Instance Manually
Where to find answers to frequently asked questions on Creating New Database Instance Manually? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on creating Oracle database instances manually using CREATE DATABASE statement. Items in this FAQ collecti... 2019-04-09, 2777🔥, 0💬

Location of Database Files in SQL Server
Where is my database stored on the hard disk in SQL Server? If a database is created with simple CREATE DATABASE statement, the server will create two database files on the hard disk to store data and configuration information about that data bases: database_name.mdf - SQL Server Database Primary Da... 2016-11-24, 2777🔥, 0💬

Establish Administrator Authentication to the Server in Oracle
How To Establish Administrator Authentication to the Server in Oracle? This is Step 2. There are two ways to establish administrator authentication to a new database. Use a password file. Use operating system (OS) authentication. Using OS authentication is easier on Windows system. If you used your ... 2019-04-03, 2776🔥, 0💬

Unlock the Sample User Account in Oracle
How To Unlock the Sample User Account in Oracle? Your 10g XE server comes with a sample database user account called HR. But this account is locked. You must unlock it before you can use it: Log into the server home page as SYSTEM. Click the Administration icon, and then click Database Users. Click ... 2020-09-30, 2775🔥, 0💬

Extract Unit Values from a Date and Time in MySQL
How To Extract a Unit Value from a Date and Time in MySQL? If you want to extract a specific date or time unit value out of a date or a time, you can use the EXTRACT(unit FROM expression) function. The tutorial exercise below gives you some good examples: ELECT EXTRACT(DAY FROM NOW()) FROM DUAL; 28 ... 2018-03-13, 2773🔥, 0💬

Drop a Tablespace in Oracle
How To Drop a Tablespace in Oracle? If you have an existing tablespace and you don't want it anymore. You can delete a tablespace by using the DROP TABLESPACE statement as shown in the example below: SQL&gt; CREATE TABLESPACE my_space 2 DATAFILE '/temp/my_space.dbf' SIZE 10M; Tablespace created.... 2019-04-13, 2771🔥, 0💬

Relations between a Tablespace and Data Files in Oracle
How a Tablespace Is Related to Data Files in Oracle? Each tablespace in an Oracle database consists of one or more files called datafiles, which are physical structures that conform to the operating system in which Oracle is running.   ⇒ Relation between Database and Tablespaces in Oracle ⇐ Oracle ... 2019-01-20, 2771🔥, 0💬

Compilation Error in a Statement Batch in SQL Server
What happens to a Transact-SQL statement batch if there is a compilation error? If a Transact-SQL statement batch has multiple statements, and one of them has compilation error, none of the statements in the batch will be executed. The tutorial exercise below gives you some good examples: SELECT get... 2017-05-29, 2771🔥, 0💬

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General MySQL Oracle SQL Server