General MySQL Oracle SQL Server

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Pass Parameters to Procedures in Oracle
How To Pass Parameters to Procedures in Oracle? Store procedures or functions can take parameters. You need to define parameters while defining the procedure, and providing values to parameters while calling the procedure. The script below shows you how to do this: SQL&gt; CREATE OR REPLACE PROC... 2018-11-11, 2830🔥, 0💬

Verify Oracle TNS Settings in Oracle
How To Verify Oracle TNS Settings in Oracle? If you have installed an Oracle server or an Oracle client tool on your local system, the TNS is automatically installed with a simple configuration file, tnsnames.ora, to define Oracle connect identifiers. For example, if you have Oracle XE server instal... 2016-10-15, 2830🔥, 0💬

What Is a Boolean Value in SQL Server
What Is a Boolean Value in SQL Server Transact-SQL? A Boolean value indicates a condition in a state of TRUE or FALSE. In Transact-SQL language, there is not storage data type defined to store a Boolean value. So Boolean values can only exist temporarily as part of the execution of Transact-SQL expr... 2017-01-29, 2829🔥, 0💬

Export Your Own Schema in Oracle
How To Export Your Own Schema in Oracle? If you have a non-system user account and you want to export all data objects in the schema associated with your account, you can use the "expdp" command with the SCHEMAS parameter. Running "expdp" command with a non-system user account requires a directory o... 2016-10-15, 2829🔥, 0💬

PS_CURRENT_THREAD_ID() - PS Thread ID of Current Connect
How to obtain the performance schema thread id of the current connection using the PS_CURRENT_THREAD_ID() function? PS_CURRENT_THREAD_ID() is a MySQL built-in function that returns the performance schema thread id of the current connection. For example: SELECT PS_CURRENT_THREAD_ID(); -- +-----------... 2025-02-16, 2825🔥, 0💬

Modes of Data Dump Export and Import in Oracle
What Are Data Pump Export and Import Modes in Oracle? Data Pump export and import modes are used to determine the type and portions of database to be exported and imported. Oracle 10g supports 5 export and import modes: Full: Exports and imports a full database. Use the FULL parameter to specify thi... 2016-10-15, 2825🔥, 0💬

Test NULL Values in Oracle
How To Test NULL Values in Oracle? There ate two special comparison operators you can use on NULL values: "variable IS NULL" - Returns TRUE if the variable value is NULL. "variable IS NOT NULL" - Return TRUE if the variable value is not NULL. The following sample script shows you examples of compari... 2018-07-13, 2823🔥, 0💬

"mysql" Command Line Options in MySQL
What Are the "mysql" Command Line Options in MySQL? "mysql" offers a big list of command line options. Here are some commonly used options: "-?" - Displays a help message on how to use "mysql" and terminates the program. "-u userName" - Specifies a user name for the server to authenticate when conne... 2018-04-28, 2821🔥, 0💬

Introduction to Oracle SQL Developer
Where to find answers to frequently asked questions on Introduction to Oracle SQL Developer? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Introduction to Oracle SQL Developer: This FAQ can also be used as learning tutorials on SQL statement exe... 2019-02-18, 2820🔥, 0💬

Bring a Tablespace Offline in Oracle
How To Bring a Tablespace Offline in Oracle? If you want to stop users using a tablespace, you can bring it offline using the ALTER TABLESPACE ... OFFLINE statement as shown in the following script: SQL&gt; connect HR/fyicenter Connected. SQL&gt; CREATE TABLESPACE my_space 2 DATAFILE '/temp/... 2019-01-01, 2819🔥, 0💬

What Are DML Statements in Oracle
What Are DML Statements in Oracle? DML (Data Manipulation Language) statements are statements to change data values in database tables. The are 3 primary DML statements: INSERT - Inserting new rows into database tables. UPDATE - Updating existing rows in database tables . DELETE - Deleting existing ... 2020-02-07, 2817🔥, 0💬

Rename an Existing Column in a Table in MySQL
How To Rename an Existing Column in a Table in MySQL? If you have an existing column in a table and you want to change the column name, you can use the "ALTER TABLE ... CHANGE" statement. This statement allows you to change the name of a column, and its definition. The tutorial script below gives yo... 2018-03-04, 2817🔥, 0💬

Verify MySQL Server Status in MySQL
How Do You Know If Your MySQL Server Is Alive in MySQL? If you want to know whether your MySQL server is alive, you can use the "mysqladmin" program in a command window as shown in the following tutorial: &gt;cd \mysql\bin &gt;mysqladmin -u root ping mysqld is alive The "mysqld is alive" mes... 2018-06-06, 2816🔥, 0💬

Truncating DATETIME Values to Dates without Time in SQL Server
How To Truncate DATETIME Values to Dates without Time in SQL Server Transact-SQL? Assuming that you have some date and time, DATETIME, values, and you want to work with dates only. You want to truncate them to dates without time, or with time of 00:00:00.000. Again, SQL Server offers no simple solut... 2017-02-08, 2816🔥, 0💬

"DROP" Statements - Deleting database objects in SQL Server
How to delete database objects with "DROP" statements in SQL Server? To remove all database objects created by previous tutorials, you could just delete the database. However, in this tutorial, you will go through the steps to reverse every action you took doing the tutorial. Removing permissions an... 2016-11-27, 2816🔥, 0💬

Show All User Accounts in Oracle
How To List All User Accounts in Oracle? User accounts can be accessed through a system view called ALL_USERS. A simple SELECT statement can be used to get a list of all user accounts. Try the following script: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter Connected. SQL&gt; ... 2019-07-21, 2812🔥, 0💬

Getting Started with Transact-SQL Statements in SQL Server
Where to find answers to frequently asked questions on Getting Started with Transact-SQL Statements in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Getting Started with Transact-SQL Statements in SQL Server. Clear examples are provi... 2016-12-02, 2810🔥, 0💬

Ways to End the Current Transaction in Oracle
How To End the Current Transaction in Oracle? There are several ways the current transaction can be ended: Running the COMMIT statement will explicitly end the current transaction. Running the ROLLBACK statement will explicitly end the current transaction. Running any DDL statement will implicitly e... 2019-09-04, 2807🔥, 0💬

Generating CREATE FUNCTION Scripts on Existing Functions in SQL Server
How To Generate CREATE FUNCTION Script on an Existing Function in SQL Server Transact-SQL? If you want to know how an existing user defined function was created, you can use SQL Server Management Studio to automatically generate a "CREATE FUNCTION" script The following tutorial shows you how to do t... 2016-12-18, 2803🔥, 0💬

Performing Comparison on Date and Time Values in SQL Server
How To Perform Comparison on Date and Time Values in SQL Server Transact-SQL? Comparison operations on date and time values can be performed in the same way as numeric values. The comparison rule is simple: a date and time value in the future has a greater value than a date and time value in the pas... 2017-01-21, 2801🔥, 0💬

Show CREATE TABLE Statements of Existing Tables in MySQL
How To See the CREATE TABLE Statement of an Existing Table in MySQL? If you want to know how an existing table was created, you can use the "SHOW CREATE TABLE" command to get a copy of the "CREATE TABLE" statement back on an existing table. The following tutorial script shows you a good example: mys... 2018-03-04, 2800🔥, 0💬

Introduction to Oracle PL/SQL
Where to find answers to frequently asked questions about Oracle PL/SQL in general? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team about Oracle PL/SQL in general. This FAQ can also be used as learning tutorials on creating procedures, executing proc... 2019-03-27, 2797🔥, 0💬

Running CREATE DATABASE Statement Again in Oracle
How To Run CREATE DATABASE Statement Again in Oracle? After cleaning up the results of a previously failed CREATE DATABASE statement, you can run the CREATE DATABASE statement again as shown below: SQL&gt; @$ORACLE_HOME\config\scripts\c reate_database_fyi.sql;CREATE DATABASE FYI * ERROR at line ... 2019-03-27, 2794🔥, 0💬

Define and Use Table Alias Names in Oracle
How To Define and Use Table Alias Names in Oracle? When column names need to be prefixed with table names, you can define table alias name and use them to prefix column names as shown in the following select statement: SQL&gt; SELECT e.first_name, e.last_name, d.department_name FROM employees e ... 2019-10-27, 2793🔥, 0💬

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General MySQL Oracle SQL Server