General MySQL Oracle SQL Server

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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, 3435🔥, 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, 3416🔥, 0💬

Retrieve CREATE TABLE Statement with SQL Developer in Oracle
How To Get a CREATE Statement for an Existing Table in Oracle? You have an existing table and want to get a CREATE statement for that table, you can use the SQL tab in the object view. The following tutorial steps show you how to use SQL Developer to generate a CREATE statement on an existing table:... 2018-10-08, 3403🔥, 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, 3374🔥, 0💬

SQL*Plus Commands Stored in a File in Oracle
How Run SQL*Plus Commands That Are Stored in a Local File in Oracle? If you have a group of commands that you need to run them repeatedly every day, you can save those commands in a file (called SQL script file), and using the "@fileName" command to run them in SQL*Plus. If you want to try this, cre... 2020-06-08, 3371🔥, 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, 3358🔥, 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, 3334🔥, 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, 3333🔥, 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, 3326🔥, 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, 3302🔥, 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, 3297🔥, 0💬

Verify 10g XE Server Installation in Oracle
How To Check Your Oracle Database 10g XE Installation in Oracle? If you want to check your fresh installation of 10g Express Edition without using any special client programs, you can use a Web browser with this address, http://localhost:8080/apex/. You will see the login page. Enter SYSTEM as the u... 2020-05-05, 3296🔥, 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, 3283🔥, 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, 3279🔥, 0💬

What Is SQL*Loader in Oracle
What Is SQL*Loader in Oracle? SQL*Loader is a database tool that allows to load data from external files into database tables. SQL*Loader is available as part of the free Oracle 10g Expression Edition. It has some interesting features as: Can load data from multiple data files into multiple tables i... 2018-06-12, 3268🔥, 0💬

Start 10g XE Server from Command Line in Oracle
How To Start Your 10g XE Server from Command Line in Oracle? You can start your 10g XE server from command line by: Open a command line window. Change directory to \oraclexe\app\oracle\product\1 0.2.0\server\BIN\.Run StartDB.bat. The batch file StartDB.bat contains: net start OracleXETNSListener net... 2020-10-10, 3246🔥, 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, 3228🔥, 0💬

Differences between BLOB and CLOB in Oracle
What Are the Differences between BLOB and CLOB in Oracle? The main differences between BLOB and CLOB are: BLOB stores values as LOB (Large OBject) in bitstreams. CLOB stores values as LOB (Large OBject) in character steams.   ⇒ ANSI Data Types in Oracle ⇐ Differences between INTERVAL YEAR TO MONTH ... 2020-04-14, 3227🔥, 0💬

User Role: Group of Privileges 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.   ⇒ System Defined User Roles in Oracle ⇐ User Account and Schema: One-to-One Relation in Ora... 2019-07-30, 3220🔥, 0💬

Transaction Commit When DDL Statement Executed in Oracle
What Happens to the Current Transaction If a DDL Statement Is Executed in Oracle? If a DDL statement is executed, the current transaction will be committed and ended. All the database changes made in the current transaction will become permanent. This is called an implicit commit by a DDL statement.... 2019-09-04, 3215🔥, 0💬

Windows Applications Connect to Oracle Servers in Oracle
How Can Windows Applications Connect to Oracle Servers in Oracle? A Windows application can connect to an Oracle server directly, if it knows how to use the Oracle TNS technology. A Windows application can connect to an Oracle server indirectly through Windows ODBC manager, because it offers ODBC dr... 2016-10-15, 3212🔥, 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, 3210🔥, 0💬

Run PL/SQL Statements in SQL*Plus in Oracle
How To Run PL/SQL Statements in SQL*Plus in Oracle? If you want to run a single PL/SQL statement in SQL*Plus, you need to use the EXECUTE command as shown in the following tutorial example: SQL&gt; SET SERVEROUTPUT ON SQL&gt; EXECUTE DBMS_OUTPUT.PUT_LINE('Welcome to FYIcenter!') Welcome to F... 2020-07-22, 3209🔥, 0💬

User Account and Schema: One-to-One Relation in Oracle
What Is the Relation of a User Account and a Schema in Oracle? User accounts and schemas have a one-to-one relation. When you create a user, you are also implicitly creating a schema for that user. A schema is a logical container for the database objects (such as tables, views, triggers, and so on) ... 2019-07-30, 3207🔥, 0💬

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General MySQL Oracle SQL Server