General MySQL Oracle SQL Server

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Database in Use When Renaming a Database in SQL Server
Why I am getting this error when renaming a database in SQL Server? If you are trying to rename a database that is in use, you will get an error message like this: "The database could not be exclusively locked to perform the operation." Before renaming a database, you must stop all client sessions u... 2016-11-20, 5305🔥, 0💬

Reset Lost SYSTEM Password in Oracle
What To Do If DBA Lost the SYSTEM Password in Oracle? If the DBA lost the password of the SYSTEM user account, he/she can go to the Oracle server machine, and run SQL*Plus on server locally with the operating system authentication method to gain access to the database. The tutorial exercise below sh... 2020-08-13, 5287🔥, 0💬

Storage Engines: MyISAM, InnoDB and BDB in MySQL
Where to find answers to frequently asked questions on Storage Engines: MyISAM, InnoDB and BDB in MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Storage Engines: MyISAM, InnoDB and BDB in MySQL. Clear explanations and tutorial exercises ar... 2017-09-12, 5277🔥, 0💬

Use SQL*Plus Built-in Timer in Oracle
How To Use SQL*Plus Built-in Timers in Oracle? If you don't have a stopwatch/timer and want to measure elapsed periods of time, you can SQL*Plus Built-in Timers with the following commands: TIMING - Displays number of timers. TIMING START [name] - Starts a new timer with or without a name. TIMING SH... 2020-06-08, 5275🔥, 0💬

Connect to Oracle Server as SYSDBA in Oracle
How To Connect the Oracle Server as SYSDBA in Oracle? This is Step 4. The best way to connect to the Oracle server as an administrator is to use SQL*Plus. You need to run SQL*Plus with /nolog option and use the CONNECT with blank user name, blank password and AS SYSDBA option. Here is a sample sessi... 2019-04-03, 5272🔥, 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, 5246🔥, 1💬

💬 2018-10-15 taj mure: Nicerere

sys.sql_modules - Getting User Defined Function Definitions Back in SQL Server
How To Get the Definition of a User Defined Function Back in SQL Server Transact-SQL? If you want get the definition of an existing user defined function back from the SQL Server, you can use the system view called sys.sql_modules, which stores definitions of functions, stored procedures, and views.... 2016-12-18, 5221🔥, 0💬

Drop a Stored Procedure in Oracle
How To Drop a Stored Procedure in Oracle? If there is an existing stored procedure and you don't want it any more, you can remove it from the database by using the DROP PROCEDURE statement as shown in the following script example: SQL&gt; CREATE PROCEDURE Greeting AS 2 BEGIN 3 DBMS_OUTPUT.PUT_LI... 2018-11-11, 5220🔥, 0💬

CONVERT() - Converting Numeric Expression Data Types in SQL Server
How To Convert Numeric Expression Data Types using the CONVERT() 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 CONVERT(data_type, expression) function. The tutorial exercise below shows you how to use the CONVERT... 2017-03-27, 5219🔥, 0💬

"ALTER AUTHORIZATION" - Changing the Ownership of a Schema in SQL Server
How To Change the Ownership of a Schema in SQL Server? If you want to change the owner of a schema, you can use the "ALTER AUTHORIZATION" statement using the following syntax: ALTER AUTHORIZATION ON SCHEMA::schema_name TO user_name The following tutorial example shows you how to change ownership of ... 2016-10-22, 5208🔥, 0💬

Create a Table in a Given Tablespace in Oracle
How To Create a Table in a Specific Tablespace in Oracle? After you have created a new tablespace, you can give it to your users for them to create tables in the new tablespace. To create a table in a specific tablespace, you need to use the TABLESPACE clause in the CREATE TABLE statement. Here is a... 2019-01-08, 5205🔥, 1💬

💬 2019-01-08 Bvm: Help :)

Presenting a Past Time in Hours, Minutes and Seconds in MySQL
How To Present a Past Time in Hours, Minutes and Seconds in MySQL? If you want show an article was posted "n hours n minutes and n seconds ago", you can use the TIMEDIFF(NOW(), pastTime) function as shown in the following tutorial exercise: SELECT TIMEDIFF(NOW(), '2006-07-01 04:09:49') FROM DUAL; 06... 2017-12-26, 5155🔥, 0💬

BEGIN ... END Statement Blocks in SQL Server Transact-SQL
How to put statements into a statement block in SQL Server Transact-SQL? You can put statements into a statement block with BEGIN and END key words in Transact-SQL using these syntaxes BEGIN statement_1 statement_2 ... END Statement blocks are mainly used with logical conditions and control-of-flow ... 2017-01-11, 5127🔥, 0💬

Using Group Functions in the SELECT Clause in MySQL
How To Use Group Functions in the SELECT Clause in MySQL? If group functions are used in the SELECT clause, they will be used on the rows that meet the query selection criteria, the output of group functions will be returned as output of the query. The following select statement returns 3 values cal... 2018-01-06, 5101🔥, 0💬

Set Up SQL*Plus Output Format in Oracle
How To Set Up SQL*Plus Output Format in Oracle? If you want to practice SQL statements with SQL*Plus, you need to set up your SQL*Plus output formatting parameter properly. The following SQL*Plus commands shows you some examples: COLUMN id FORMAT 9999; COLUMN url FORMAT A24; COLUMN notes FORMAT A12;... 2020-01-29, 5058🔥, 0💬

SQL Server Transact-SQL Language References
Where to find SQL Server Transact-SQL language references? You can find SQL Server Transact-SQL language references on Microsoft Website: Transact-SQL Reference for SQL Server 2016 Transact-SQL Reference for SQL Server 2014 Transact-SQL Reference for SQL Server 2012 Transact-SQL Reference for SQL Se... 2017-05-20, 5025🔥, 0💬

Scope Levels of User Privileges in MySQL
How Many Scope Levels Can User Privileges Apply in MySQL? MySQL supports 5 scope levels a user privilege can be granted: Global Level - A privilege granted at this level applies to all databases on the server. Privileges granted at the global level stored in "mysql.user" table. Database Level - A pr... 2017-12-09, 5011🔥, 0💬

What Is a Dynamic Performance View in Oracle
What Is a Dynamic Performance View in Oracle? Oracle contains a set of underlying views that are maintained by the database server and accessible to the database administrator user SYS. These views are called dynamic performance views because they are continuously updated while a database is open an... 2020-10-26, 4999🔥, 1💬

💬 2019-10-16 Aninda: Best tutorial

What Is SQL Language
What Is SQL Language? SQL, SEQUEL (Structured English Query Language), is a language for RDBMS (Relational Database Management Systems). During the 1970s, a group at IBM's San Jose research center developed a database system "System R" based upon Codd's model. Structured English Query Language ("SEQ... 2017-06-16, 4996🔥, 0💬

Omitting Columns in INSERT Statements in MySQL
How To Omit Columns with Default Values in INSERT Statement in MySQL? If you don't want to specify values for columns that have default values, or you want to specify values to columns in an order different than how they are defined, you can provide a column list in the INSERT statement. If a column... 2018-01-16, 4969🔥, 0💬

"ALTER LOGIN" - Disabling a Login Name in SQL Server
How To Disable a Login Name in SQL Server? If you want temporarily disable a login name, you can use the "ALTER LOGIN" statement with a DISABLE keyword. If you want to enable it later on, you can use the ENABLE keyword. The tutorial exercise below shows how to disable and enable login name "Dba_Logi... 2016-10-19, 4963🔥, 0💬

What Is SQL*Plus in Oracle
What Is SQL*Plus in Oracle? SQL*Plus is an interactive and batch query tool that is installed with every Oracle Database Server or Client installation. It has a command-line user interface, a Windows Graphical User Interface (GUI) and the iSQL*Plus web-based user interface.   ⇒ What Is Transport Net... 2020-05-29, 4947🔥, 2💬

💬 2020-05-29 FYIcenter.com: @Frank, Yes. SQL*Plus offers you query tools to connect to remote Oracle servers.

💬 2020-05-27 Frank Jam: What the usage for SQL*Plus? Query tools

Date and Time Data Types in SQL Server Transact-SQL
What are date and time data types supported in SQL Server Transact-SQL? Date and time data types are used to hold dates and times. There are 6 date and time data types supported in SQL Server Transact-SQL: 1. DATETIME - Use to hold date and times with a large precision using 8-byte storages: 4 bytes... 2017-04-15, 4933🔥, 0💬

Keep Data Files When Tablespace Dropped in Oracle
What Happens to Data Files If a Tablespace Is Dropped in Oracle? If a tablespace is dropped, what happens to its data files? By default, data files will remain in OS file system, even if the tablespace they are mapped is dropped. Of course, you delete the data files using OS commands, if they are no... 2019-01-01, 4927🔥, 0💬

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General MySQL Oracle SQL Server