General MySQL Oracle SQL Server

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Instance Settings Stored in SPFile in Oracle
Where Are the Settings Stored for Each Instance in Oracle? Settings for each instance are stored in a file called Server Parameter File (SPFile). Oracle supports two types of parameter files, Text type, and Binary type. parameter files should be located in $ORACLE_HOME\database directory. A paramete... 2020-09-15, 3002🔥, 0💬

Types of PL/SQL Code Blocks in Oracle
What Are the Types PL/SQL Code Blocks in Oracle? There are 3 types of PL/SQL code blocks: Anonymous Block - A block of codes with no name. It may contain a declaration part, an execution part, and exception handlers. Stored Program Unit - A block of codes with a name. It is similar to an anonymous b... 2018-10-30, 3002🔥, 0💬

Variables and Data Types in SQL Server Transact-SQL
Where to find answers to frequently asked questions on variables and data types in Microsoft SQL Server Transact-SQL? I am new to Transact-SQL and SQL Server. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com team on variables and data types in Microsoft SQL Se... 2017-04-22, 3001🔥, 0💬

Ways to Start a New Transaction in Oracle
How To Start a New Transaction in Oracle? There is no SQL statement to explicitly start a new transaction. Oracle server implicitly starts a new transaction with the following two conditions: The first executable statement of a new user session will automatically start a new transaction. The first e... 2019-09-16, 3000🔥, 0💬

Run SQL Statement through Web UI in Oracle
How To Run SQL Statements through the Web Interface in Oracle? If you don't like the command line interface offered by SQL*Plus, you can use the Web interface to run SQL statements. Here is how: Open your Web browser to http://localhost:8080/apex/ Log in to the server with the predefined sample user... 2019-05-01, 3000🔥, 0💬

Date and Time Interval Literals in Oracle
How To Write Date and Time Interval Literals in Oracle? Date and time interval literals can coded as shown in the following samples: SELECT DATE '2002-10-03' + INTERVAL '123-2' YEAR(3) TO MONTH FROM DUAL -- 123 years and 2 months is added to 2002-10-03 03-DEC-25 SELECT DATE '2002-10-03' + INTERVAL '... 2020-03-25, 2998🔥, 0💬

Default Schema of Your Login Session in SQL Server
What Is the Default Schema of Your Login Session in SQL Server? When you login to a SQL Server and select a database to use, SQL Server will assign your login session a default schema. The schema name can be omitted when you refer to objects in the default schema. Here is what you should remember ab... 2016-10-22, 2998🔥, 0💬

Finding the Login Name Linked to a Given User Name in SQL Server
How To Find the Login Name Linked to a Given User Name in SQL Server? If you know a user name in a database and you want to find out which login name is linked this user name, you need to check the Security ID (SID) of the user name based on the following rules: Each login name is associated a uniqu... 2017-08-25, 2996🔥, 0💬

Using Old Values to Define New Values in UPDATE Statements in SQL Server
How to use old values to define new values in UPDATE statements in SQL Server? If a row matches the WHERE clause in a UPDATE statement, existing values in this row can be used in expressions to provide new values in the SET clause. Existing values are represented by column names in the expressions. ... 2016-11-02, 2994🔥, 0💬

Installing MySQL Server in MySQL
How To Install MySQL Server in MySQL? MySQL is an open source database management system developed by MySQL AB, http://www.mysql.com. You can download a copy and install it on your local computer very easily. Here is how you can do this: Go to http://dev.mysql.com/downloads /mysql/5.0.html.Select th... 2018-06-12, 2992🔥, 0💬

OUTPUT - Defining Output Parameters in Stored Procedures in SQL Server
How To Define Output Parameters in Stored Procedures in SQL Server Transact-SQL? Sometime a stored procedure not only want to take input values from the calling statement batch, but it also want to send output values back to the calling statement batch. This can be done by defining output parameters... 2016-12-28, 2988🔥, 0💬

Ways to Start a New Transaction in MySQL
How To Start a New Transaction in MySQL? MySQL server offers two modes to manage transactions: Autocommit On - Default mode. Can be started with "SET AUTOCOMMIT = 1" command. In this mode, every single SQL statement is a new transaction. All changes will be committed at the end of the statement exec... 2016-10-17, 2988🔥, 0💬

Create a Server Parameter File in Oracle
How To Create a Server Parameter File in Oracle? This is Step 5. The initialization parameter file is good to get an Oracle database instance started. But it is not ideal run an instance as production. You need to convert the initialization parameter file into a Server Parameter File (SPFile) using ... 2018-05-08, 2986🔥, 0💬

SQL Server TCP/IP Connection Info
What information is needed for a client tool or application to connect to a SQL Server database using the TCP/IP protocol? In order to connect to a SQL Server database using the TCP/IP protocol, you need to know the following information: 1. Host Name - The name of the hosting computer where the SQL... 2024-08-14, 2980🔥, 0💬

Assign a Tablespace to a User in Oracle
How To Assign a Tablespace to a Users in Oracle? When you create a new user, Oracle will assign the SYSTEM tablespace to the user by default. If you want to change this, you can assign a different table space to a user using the ALTER USER command. The following tutorial exercise changes user dev's ... 2019-06-29, 2980🔥, 0💬

What Is "mysqladmin" Command in MySQL
What Is "mysqladmin" in MySQL? "mysqladmin" is a command-line interface for administrators to perform server administration tasks. It support a number of commonly used commands like: "mysqladmin shutdown" - Shuts down the server. "mysqladmin ping" - Checks if the server is alive or not. "mysqladmin ... 2018-06-01, 2980🔥, 0💬

User Privilege Tables in MySQL
Where Are User Privileges Stored on the Server in MySQL? MySQL server has a system database, which hosts a number of system tables to system related information like user privileges. Depending on the scope levels, granted user privileges are stored in different tables: "mysql.user" - Stores privileg... 2017-12-09, 2975🔥, 0💬

Turn on and off Autocommit in MySQL
How To Switch between Autocommit-On and Autocommit-Off Modes in MySQL? By default, your connection session will be in Autocommit-On mode, where every server executable statement will start a new transaction, and end the transaction when the execution ends. Changes will be committed. So consider this... 2016-10-17, 2975🔥, 0💬

Returning Query Output in XML Format in MySQL
How To Return Query Output in XML Format in MySQL? By default, "mysql" returns query output in text table format. If you want to receive query output in XML format, you need to use the "-X" command option. Here is a good tutorial exercise: &gt;cd \mysql\bin &gt;mysql -u root -X test mysql&am... 2018-04-21, 2973🔥, 0💬

Divide Query Output into Groups in Oracle
How To Divide Query Output into Groups in Oracle? You can divide query output into multiple groups with the GROUP BY clause. It allows you specify a column as the grouping criteria, so that rows with the same value in the column will be considered as a single group. When the GROUP BY clause is speci... 2019-11-21, 2971🔥, 0💬

Configuring ODBC Connection and DSN for SQL Servers
A collection of 13 FAQs on connecting SQL Server via an ODBC DSN setting. Clear explanations and tutorial exercises are provided on creating new DSN with the SQL Server ODBC driver; starting SQL Server Browser Service; enabling TCP/IP protocol on SQL Server; verifying TCP/IP port numbers; testing OD... 2024-08-14, 2967🔥, 0💬

Scalar Data Types Supported in PL/SQL in Oracle
How Many Scalar Data Types Are Supported in PL/SQL in Oracle? PL/SQL supports many scalar data types divided into 4 groups: Numeric Types: BINARY_DOUBLE, BINARY_FLOAT, BINARY_INTEGER, DEC, DECIMAL, DOUBLE PRECISION, FLOAT, INT, INTEGER, NATURAL, NATURALN, NUMBER, NUMERIC, PLS_INTEGER, POSITIVE, POSI... 2018-11-17, 2965🔥, 0💬

Start a Specific Oracle Instance in Oracle
How To Start a Specific Oracle Instance in Oracle? A simple way to start a specific Oracle instance is to start the instance with the PFILE option as shown in the following example: &gt;.\bin\sqlplus /nolog SQL&gt; CONNECT / AS SYSDBA Connected. SQL&gt; STARTUP NOMOUNT PFILE=$ORACLE_HOME... 2018-05-08, 2965🔥, 0💬

COLLATE Clause in SQL Server Transact-SQL
How To Specify the Collation for a Character Data Type in SQL Server Transact-SQL? If you do not want to use the default collation provided by the SQL Server, you can use the "COLLATE collation_name" clause to specify a different collation to be used at different levels: Database Level - Used in CRE... 2017-05-13, 2964🔥, 0💬

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General MySQL Oracle SQL Server