General MySQL Oracle SQL Server

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Connect SQL*Plus Session to Oracle Server in Oracle
How To Connect a SQL*Plus Session to an Oracle Server in Oracle? In order to connect a SQL*Plus session to an Oracle server, you need to: 1. Obtain the connection information from the Oracle server DBA. 2. Define a new "connect identifier" called "FYI_XE" in your tnsnames.org file with the given con... 2020-08-13, 2456🔥, 0💬

PRINT Statements in SQL Server Transact-SQL
How to print value on console in SQL Server Transact-SQL? How to use the PRINT statements? In Transact-SQL, you can use PRINT statements to print values on the console of the client tool, in the syntax of: PRINT &lt;value&gt; When a PRINT statement is executed, the system will: Print the val... 2017-04-01, 2454🔥, 0💬

What Are Indexes in SQL Server
What Are Indexes in SQL Server? An index is a secondary database object associated with a table to improve the retrieval performance of rows from that table. An index can be defined for a single column or multiple columns of a given table. If an index is defined on a single column of a table, the in... 2016-11-15, 2434🔥, 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, 2432🔥, 0💬

CREATE VIEW - Creating a View on an Existing Table in SQL Server
How To Create a View on an Existing Table in SQL Server? If you want to a view on an existing table, you can use the CREATE VIEW statement in a simple syntax: CREATE VIEW view_name AS SELECT ... The tutorial exercise below shows you how to create a view to represent sub set of data stored in fyi_lin... 2016-11-05, 2432🔥, 0💬

Measuring Performance of INSERT Statements in SQL Server
How To Measure Performance of INSERT Statements in SQL Server? When indexes are defined for a table, each time a new row is inserted to the table, all the indexes must be updated. This extra update work could slow down the insert statement. To find out how much slower the INSERT statements will be o... 2016-11-13, 2428🔥, 0💬

Where Is the Export Dump File Located in Oracle
Where Is the Export Dump File Located in Oracle? If you are not specifying the dump directory and file name, the dump file will be stored in the default dump directory with the default file name. The tutorial exercise below tells you find what is your default dump directory and locate the dump file.... 2016-10-15, 2428🔥, 0💬

Using User Defined Functions in SQL Server Transact-SQL
Where to find answers to frequently asked questions on Using User Defined Functions in SQL Server Transact-SQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Using User Defined Functions in SQL Server Transact-SQL. Clear answers are provided wit... 2016-12-28, 2422🔥, 0💬

Drop a Stored Function in Oracle
How To Drop a Stored Function in Oracle? If there is an existing stored function and you don't want it any more, you can remove it from the database by using the DROP FUNCTION statement as shown in the following script example: SQL&gt; CREATE OR REPLACE FUNCTION GET_SITE 2 RETURN VARCHAR2 AS 3 B... 2018-10-26, 2412🔥, 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, 2412🔥, 0💬

Error: Could not Resolve the Connect Identifier in Oracle
What Happens If You Use a Wrong Connect Identifier in Oracle? Of course, you will get an error, if you use a wrong connect identifier. Here is an example of how SQL*Plus react to a wrong connect identifier: SQL&gt; CONNECT fyi/retneciyf@WRONG; ERROR: ORA-12154: TNS:could not resolve the connect ... 2020-08-13, 2406🔥, 0💬

Converting Binary Strings into Unicode Character Strings in SQL Server
Can Binary Strings Be Converted into Unicode Character Strings in SQL Server Transact-SQL? Can binary strings be converted into Unicode character strings? The answer is yes. But you need to know how Unicode characters are represented in a binary format. Remember the following simple rules: An ASCII ... 2017-02-28, 2405🔥, 0💬

Introduction to Oracle Database 10g Express Edition
Where to find answers to frequently asked questions on Oracle Database 10g Express Edition? I want to learn how to install Oracle database. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Oracle Database 10g Express Edition with installation instr... 2020-05-15, 2401🔥, 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, 2399🔥, 0💬

Export Data to a CSV File in Oracle
How To Export Data to a CSV File in Oracle? If you want to export data from a table to a file in CSV format, you can use the following steps: Right-click the table name, EMPLOYEES, in the object tree view. Select Export. Select CSV. The Export Data window shows up. Click Format tab. Select Format as... 2019-01-26, 2393🔥, 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, 2392🔥, 0💬

What Is Microsoft SQL Server in SQL Server
What is Microsoft SQL Server in SQL Server? Microsoft SQL Server is a relational database management system (RDBMS) developed by Microsoft. It runs on Windows systems and uses Transact-SQL as the query language. Microsoft SQL Server release history: 1993 - SQL Server 4.21 for Windows NT 1995 - SQL S... 2016-12-08, 2390🔥, 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, 2386🔥, 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, 2382🔥, 0💬

Error: Single-Row Subquery Returns More Than One Row in Oracle
What Happens If the UPDATE Subquery Returns Multiple Rows in Oracle? If a subquery is used in a UPDATE statement, it must return exactly one row for each row in the update table that matches the WHERE clause. If it returns multiple rows, Oracle server will give you an error message. To test this out... 2020-01-21, 2382🔥, 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, 2358🔥, 0💬

What Is a User Role in Oracle
What Is a User Role in Oracle? A user role is a group of privileges. Privileges are assigned to users through user roles. You create new roles, grant privileges to the roles, and then grant roles to users.   ⇒ What Is a Database Schema in Oracle ⇐ Relations of a User Account and a Schema in Oracle ... 2020-11-22, 2349🔥, 0💬

Creating a View with Data from Multiple Tables in SQL Server
Can You Create a View with Data from Multiple Tables in SQL Server? Can You Create a View with Data from Multiple Tables? The answer is yes. A view can be created with a SELECT statement to join data from multiple tables. It is a common practice to normalize data into multiple tables. Then using a v... 2016-11-05, 2343🔥, 0💬

Change SQL*Plus System Settings in Oracle
How To Change SQL*Plus System Settings in Oracle? SQL*Plus environment is controlled a big list of SQL*Plus system settings. You can change them by using the SET command as shown in the following list: SET AUTOCOMMIT OFF - Turns off the auto-commit feature. SET FEEDBACK OFF - Stops displaying the "2... 2020-07-22, 2335🔥, 0💬

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General MySQL Oracle SQL Server