General MySQL Oracle SQL Server

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Change Transaction Isolation Level in MySQL
How To View and Change the Current Transaction Isolation Level in MySQL? If you want to view or change the current transaction isolation level, you can use the following commands: SELECT @@TX_ISOLATION FROM DUAL; -- Viewing the current transaction isolation level. SET TRANSACTION ISOLATION LEVEL lev... 2017-08-08, 3852🔥, 0💬

How To Count Duplicated Values in a Column? in SQL Server
How To Count Duplicated Values in a Column in SQL Server? If you have a column with duplicated values, and you want to know what are those duplicated values are and how many duplicates are there for each of those values, you can use the "GROUP BY ... HAVING" clause as shown in the following example.... 2016-10-25, 3849🔥, 0💬

Use "IN OUT" Parameters in Oracle
How To Use "IN OUT" Parameter Properly in Oracle? Here are the rules about IN OUT parameters: A formal IN OUT parameter acts like an initialized variable. An actual IN OUT parameter must be a variable. An actual IN OUT parameter passes a copy of its value to the formal parameter when entering the pr... 2018-10-19, 3846🔥, 0💬

Date/Time Operations and Functions in SQL Server Transact-SQL
Where to find answers to frequently asked questions on Date/Time Operations and Functions in SQL Server Transact-SQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Date/Time Operations and Functions in SQL Server Transact-SQL. Clear answers are ... 2017-02-25, 3846🔥, 0💬

JSON_SET() - Inserting/updating JSON Child Members
How to insert or update child members of a JSON (JavaScript Object Notation) value using the JSON_SET() function? JSON_SET(json, path1, val1, path2, val2, ...) is a MySQL built-in function that inserts child members of a JSON value at given new locations, and replaces child numbers at given existing... 2025-03-12, 3828🔥, 0💬

Introduction to Date and Time Handling in MySQL
Where to find answers to frequently asked questions on Introduction to Date and Time Handling in MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Introduction to Date and Time Handling in MySQL. Clear answers are provided with tutorial exerc... 2021-08-04, 3820🔥, 2💬

💬 2021-03-13 Strain John: Hey, u gave us good information. It is easy to understand for everyone and also having good content. I appreciated your afforts ...

Query Multiple Tables Jointly in MySQL
How To Query Multiple Tables Jointly in MySQL? If you want to query information stored in multiple tables, you can use the SELECT statement with a WHERE condition to make an inner join. Assuming that you have 3 tables in a forum system: "users" for user profile, "forums" for forums information, and ... 2017-06-23, 3818🔥, 0💬

Generate Query Output in HTML Format in Oracle
How To Generate Query Output in HTML Format in Oracle? If you want your query output to be generated in HTML format, you can use the "SET MARKUP HTML ON" to turn on the HTML feature. The following tutorial exercise gives you a good example: SQL&gt; connect HR/retneciyf SQL&gt; SET MARKUP HTM... 2020-07-15, 3816🔥, 0💬

Understanding SQL Transaction Management in Oracle
Where to find answers to frequently asked questions on SQL Transaction Management in Oracle? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on SQL Transaction Management in Oracle. Clear answers are provided with tutorial exercises on starting and e... 2019-09-16, 3807🔥, 0💬

What Is a Static Data Dictionary in Oracle
What Is a Static Data Dictionary in Oracle? Data dictionary tables are not directly accessible, but you can access information in them through data dictionary views. To list the data dictionary views available to you, query the view DICTIONARY. Many data dictionary tables have three corresponding vi... 2020-10-26, 3804🔥, 0💬

Convert Dates to Character Strings in Oracle
How To Convert Dates to Characters in Oracle? You can convert dates to characters using the TO_CHAR() function as shown in the following examples: SELECT TO_CHAR(SYSDATE, 'DD-MON-YYYY') FROM DUAL; -- SYSDATE returns the current date 07-MAY-2006 SELECT TO_CHAR(SYSDATE, 'YYYY/MM/DD') FROM DUAL; 2006/0... 2020-03-25, 3803🔥, 0💬

What Is a Database Table in Oracle
What Is a Database Table in Oracle? A database table is a basic unit of data logical storage in an Oracle database. Data is stored in rows and columns. You define a table with a table name, such as employees, and a set of columns. You give each column a column name, such as employee_id, last_name, a... 2020-11-22, 3788🔥, 0💬

Requirements for SQL*Plus Connection in Oracle
What Information Is Needed to Connect SQL*Plus an Oracle Server in Oracle? If you want to connect your SQL*Plus session to an Oracle server, you need to know the following information about this server: The network hostname, or IP address, of the Oracle server. The network port number where the Orac... 2020-08-25, 3785🔥, 0💬

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, 3780🔥, 0💬

ICU_VERSION() - ICU (International Components for Unicode) Version
How to obtain the version number of the ICU (International Components for Unicode) library using the ICU_VERSION() function? ICU_VERSION() is a MySQL built-in function that returns the version number of the ICU (International Components for Unicode) library. For example: SELECT ICU_VERSION(); -- +--... 2025-04-11, 3778🔥, 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, 3776🔥, 0💬

OFFLINE - Taking a database offline in SQL Server
How to set a database state to OFFLINE in SQL Server? If you want to move database physical files, you should take the database offline by using the "ALTER DATABASE" statement with the following syntax: ALTER DATABASE database_name SET OFFLINE The following tutorial example will bring "FyiCenterComD... 2016-11-20, 3770🔥, 0💬

What Is a Table Index in Oracle
What Is a Table Index in Oracle? Index is an optional structure associated with a table that allow SQL statements to execute more quickly against a table. Just as the index in this manual helps you locate information faster than if there were no index, an Oracle Database index provides a faster acce... 2020-11-22, 3766🔥, 0💬

Import One Table back from a Dump File in Oracle
How To Import One Table Back from a Dump File in Oracle? If you only want to import one table back to the database, you can use a dump file that was created by full export, schema export or a table export. The following tutorial exercise shows you how to import the "fyi_links" table from a dump file... 2016-10-15, 3766🔥, 0💬

Calculating the Difference between Two Time Values in MySQL
How To Calculate the Difference between Two Time Values in MySQL? If you have two time values, and you want to know the time difference between them, you can use the TIMEDIFF(time1, time2) function as shown below: SELECT TIMEDIFF(TIME('19:26:50'), TIME('09:26:50')) FROM DUAL; 10:00:00 SELECT TIMEDIF... 2017-12-26, 3761🔥, 0💬

Use Multiple Columns in GROUP BY in Oracle
Can Multiple Columns Be Used in GROUP BY in Oracle? You can use multiple columns in the GROUP BY clause as shown in the following example. It returns how many employees are having the same salary in each department: SQL&gt; SELECT department_id, salary, count(*) 2 FROM employees GROUP BY departm... 2019-10-27, 3756🔥, 0💬

Define External Table in a Text File in Oracle
How To Define an External Table in a Text File in Oracle? You can use the CREATE TABLE statement to create external tables. But you need to use ORGANIZATION EXTERNAL clause to specify the external file location and the data access driver. The tutorial exercise below shows you how to define an extern... 2016-10-19, 3756🔥, 1💬

💬 2016-10-19 Randy: Great example, Thanks!

What Is BDB in MySQL
What Is BDB (BerkeleyDB) in MySQL? BDB (BerkeleyDB) is transaction safe storage engine originally developed at U.C. Berkeley. It is now developed by Sleepycat Software, Inc. (an Oracle company now).   ⇒ What Is CSV in MySQL ⇐ What Is InnoDB in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ ... 2017-07-03, 3755🔥, 0💬

CREATE TABLE - Creating New Tables in SQL Server
How to create new tables with "CREATE TABLE" statements in SQL Server? If you want to create a new table, you can use the "CREATE TABLE" statement. The following tutorial script shows you how to create a table called "tip": CREATE TABLE tip (id INTEGER PRIMARY KEY, subject VARCHAR(80) NOT NULL, desc... 2016-11-17, 3751🔥, 0💬

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General MySQL Oracle SQL Server