General MySQL Oracle SQL Server

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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, 3824🔥, 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, 3795🔥, 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, 3786🔥, 0💬

What Is an Oracle Data File in Oracle
What Is an Oracle Data File in Oracle? An Oracle data file is a big unit of physical storage in the OS file system. One or many Oracle data files are organized together to provide physical storage to a single Oracle tablespace.   ⇒ What Is a Static Data Dictionary in Oracle ⇐ What Is an Oracle Tabl... 2020-10-26, 3761🔥, 0💬

Output Spooling in SQL*Plus in Oracle
What Is Output Spooling in SQL*Plus in Oracle? The output spooling a nice feature of the command-line SQL*Plus tool. If the spooling feature is turned on, SQL*Plus will send a carbon copy of the everything on your screen to a specified local file. Output spooling is used mostly for quick dump of dat... 2020-07-15, 3759🔥, 0💬

Open Multiple Cursors at the Same Time in Oracle
Can Multiple Cursors Being Opened at the Same Time in Oracle? Yes, multiple cursors can be opened at the same time. See the following example: CREATE OR REPLACE PROCEDURE FYI_CENTER AS CURSOR emp_cur IS SELECT * FROM employees; emp_rec employees%ROWTYPE; CURSOR dpt_cur IS SELECT * FROM departments; ... 2018-04-07, 3737🔥, 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, 3730🔥, 0💬

SQL*Plus Environment Variables in Oracle
What Are SQL*Plus Environment Variables in Oracle? Behaviors of SQL*Plus are also controlled a some environment variables predefined on the local operating system. Here are some commonly used SQL*Plus environment variables: ORACLE_HOME - The home directory where your Oracle client application is ins... 2020-07-22, 3729🔥, 0💬

Types of Commands Executed in SQL*Plus in Oracle
What Types of Commands Can Be Executed in SQL*Plus in Oracle? There are 4 types of commands you can run at the SQL*Plus command line prompt: 1. SQL commands - Standard SQL statements to be executed on target database on the Oracle server. For example: "SELECT * FROM fyi_faq;" is a SQL command. 2. PL... 2020-08-13, 3711🔥, 0💬

Main Features of 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. SQL*Plus has its own comm... 2020-08-25, 3706🔥, 0💬

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, 3696🔥, 0💬

ALTER INDEX - Rename an Index in Oracle
How To Rename an Index in Oracle? Let's say you have an existing index, and you don't like its name anymore for some reason, you can rename it with the ALTER INDEX ... RENAME TO statement. Here is an example script on how to rename an index: CREATE TABLE student (id NUMBER(5) PRIMARY KEY, first_name... 2020-02-20, 3690🔥, 0💬

Shutdown 10g XE Server in Oracle
How To Shutdown Your 10g XE Server in Oracle? If you want to shutdown your 10g Express Edition server, go to the Services manager in the control panel. You will a service called OracleServiceXE, which represents your 10g Express Edition server. Select OracleServiceXE, and use the right mouse click t... 2020-10-10, 3680🔥, 0💬

Increment Dates by 1 in Oracle
How To Increment Dates by 1 in Oracle? If you have a date, and you want to increment it by 1. You can do this by adding the date with a date interval. You can also do this by adding the number 1 directly on the date. The tutorial example below shows you how to adding numbers to dates, and take date ... 2020-03-15, 3668🔥, 0💬

Managing Oracle User Accounts, Schema and Privileges
Where to find answers to frequently asked questions on Managing Oracle User Accounts, Schema and Privileges? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Oracle User Accounts, Schema and Privileges. Clear answers are provided with tuto... 2019-07-30, 3627🔥, 0💬

Retrieve the Count of Updated Rows in Oracle
How To Retrieve the Count of Updated Rows in Oracle? After running an UPDATE statement, the database server returns a count of updated rows. You can retrieve this count from a special predefined variable called SQL%ROWCOUT, as shown in the following tutorial: CREATE TABLE emp_temp AS SELECT * FROM e... 2018-09-13, 3622🔥, 0💬

Create a New Table with SELECT Statements in Oracle
How To Create a New Table by Selecting Rows from Another Table in Oracle? Let's say you have a table with many data rows, now you want to create a backup copy of this table of all rows or a subset of them, you can use the CREATE TABLE...AS SELECT statement to do this. Here is an example script: &... 2020-02-29, 3615🔥, 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, 3605🔥, 0💬

Error: Exact Fetch Returns More Rows in Oracle
Can You Assign Multiple Query Result Rows To a Variable in Oracle? You can use "SELECT ... INTO variable" to assign query results to variables. But what happens if the SELECT statements return multiple rows? The answer is that you will get a run time error. The following tutorial exercise shows this... 2018-09-24, 3596🔥, 0💬

Privilege to Create Tables in Oracle
What Privilege Is Needed for a User to Create Tables in Oracle? To be able to create tables in a user's own schema, the user needs to have the CREATE TABLE privilege, or the CREATE ANY TABLE privilege, which is more powerful, and allows the user to create tables in other user's schema. The following... 2019-06-29, 3561🔥, 0💬

Change System Global Area (SGA) in Oracle
How To Change System Global Area (SGA) in Oracle? Your 10g XE server has a default setting for System Global Area (SGA) of 140MB. The SGA size can be changed to a new value depending on how many concurrent sessions connecting to your server. If you are running this server just for yourself to improv... 2020-09-30, 3560🔥, 0💬

Indexes for the PRIMARY KEY Column in Oracle
What Is an Index Associated with a Constraint in Oracle? An index associated with a constraint because this constraint is required to have an index. There are two types of constraints are required to have indexes: UNIQUE and PRIMARY KEY. When you defines a UNIQUE or PRIMARY KEY constraint in a table... 2019-05-01, 3547🔥, 0💬

Formal Parameters and Actual Parameters in Oracle
What Is the Difference between Formal Parameters and Actual Parameters in Oracle? Formal parameter and actual parameter are two different terms related parameters used in the procedures and functions: A formal parameter is a term used to refer to a parameter defined in the procedure or function decl... 2018-03-18, 3545🔥, 0💬

What Is a Connect Identifier in Oracle
What Is a Connect Identifier in Oracle? A "connect identifier" is an identification string of a single set of connection information to a specific target database instance on a specific Oracle server. Connect identifiers are defined and stored in a file called tnsnames.ora located in $ORACLE_HOME/ne... 2020-08-13, 3529🔥, 0💬

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General MySQL Oracle SQL Server