General MySQL Oracle SQL Server

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Invoke the Data Pump Import Utility in Oracle
How To Invoke the Data Pump Import Utility in Oracle? The Data Pump Import utility is distributed as executable file called "impdp.exe". To invoke this utility, you should go to the "bin" directory of your Oracle server installation and run the "impdp" command. Here is tutorial exercise on how to in... 2016-10-15, 3168🔥, 0💬

Passing Expressions to Stored Procedure Parameters in SQL Server
Can You Pass Expressions to Stored Procedure Parameters in SQL Server Transact-SQL? Can you pass expressions to stored procedure parameters? The answer is no. When executing stored procedures, all input values must be entered as data literals, which can be specified within single quotes ('), or with... 2016-12-28, 3167🔥, 0💬

Accessing MySQL Server through Firewalls in MySQL
How To Access MySQL Servers through Firewalls in MySQL? If your MySQL server is provided by an Internet service company, connecting to the server from your local machine will not be so easy, because there are firewalls between your local machine and your MySQL server as shown below: Firewalls to MyS... 2017-11-25, 3162🔥, 0💬

Verify Oracle TNS Settings in Oracle
How To Verify Oracle TNS Settings in Oracle? If you have installed an Oracle server or an Oracle client tool on your local system, the TNS is automatically installed with a simple configuration file, tnsnames.ora, to define Oracle connect identifiers. For example, if you have Oracle XE server instal... 2016-10-15, 3162🔥, 0💬

What Are DML Statements in Oracle
What Are DML Statements in Oracle? DML (Data Manipulation Language) statements are statements to change data values in database tables. The are 3 primary DML statements: INSERT - Inserting new rows into database tables. UPDATE - Updating existing rows in database tables . DELETE - Deleting existing ... 2020-02-07, 3160🔥, 0💬

Define and Use Table Alias Names in Oracle
How To Define and Use Table Alias Names in Oracle? When column names need to be prefixed with table names, you can define table alias name and use them to prefix column names as shown in the following select statement: SQL&gt; SELECT e.first_name, e.last_name, d.department_name FROM employees e ... 2019-10-27, 3156🔥, 0💬

What Is a Result Set Object in MySQL
What Is a Result Set Object in MySQL? A result set object is a logical representation of data rows returned by mysql_query() function on SELECT statements. Every result set object has an internal pointer used to identify the current row in the result set. Once you get a result set object, you can us... 2017-09-20, 3154🔥, 0💬

Getting Started with Transact-SQL Statements in SQL Server
Where to find answers to frequently asked questions on Getting Started with Transact-SQL Statements in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Getting Started with Transact-SQL Statements in SQL Server. Clear examples are provi... 2016-12-02, 3154🔥, 0💬

Export Your Own Schema in Oracle
How To Export Your Own Schema in Oracle? If you have a non-system user account and you want to export all data objects in the schema associated with your account, you can use the "expdp" command with the SCHEMAS parameter. Running "expdp" command with a non-system user account requires a directory o... 2016-10-15, 3154🔥, 0💬

Retrieve Data from a Cursor to a RECORD in Oracle
How To Retrieve Data from a Cursor to a RECORD in Oracle? If you have a cursor opened ready to use, you can also use the FETCH statement to retrieve data from the cursor into a RECORD variable as shown in the tutorial exercise below: CREATE OR REPLACE PROCEDURE FYI_CENTER AS CURSOR t_list IS SELECT ... 2018-07-22, 3151🔥, 0💬

Non-Standard SQL Commands in MySQL
What Are the Non-Standard SQL Commands Supported by "mysql" in MySQL? There are many non-standard SQL commands that are supported by "mysql". Here is short list of some commonly used commands: "SHOW infoName" - Shows basic information of based on the specified information name. "SHOW infoName" - Sho... 2018-02-08, 3148🔥, 0💬

Group Functions Used with Non-group Selection Fields in Oracle
Can Group Functions Be Mixed with Non-group Selection Fields in Oracle? If a group function is used in the SELECT clause, all other selection fields must be group level fields. Non-group fields can not be mixed with group fields in the SELECT clause. The script below gives you an example of invalid ... 2019-11-21, 3144🔥, 0💬

Command-Line End User Interface 'mysql'
Where to find answers to frequently asked questions on Command-Line End User Interface "mysql"? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Command-Line End User Interface "mysql". Clear answers are provided with tutorial exercises on mysql co... 2018-04-28, 3143🔥, 0💬

Ways to End the Current Transaction in Oracle
How To End the Current Transaction in Oracle? There are several ways the current transaction can be ended: Running the COMMIT statement will explicitly end the current transaction. Running the ROLLBACK statement will explicitly end the current transaction. Running any DDL statement will implicitly e... 2019-09-04, 3139🔥, 0💬

Omit Columns in INSERT Statements in Oracle
How To Omit Columns with Default Values in INSERT Statement in Oracle? 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 colum... 2020-01-29, 3138🔥, 0💬

Modes of Data Dump Export and Import in Oracle
What Are Data Pump Export and Import Modes in Oracle? Data Pump export and import modes are used to determine the type and portions of database to be exported and imported. Oracle 10g supports 5 export and import modes: Full: Exports and imports a full database. Use the FULL parameter to specify thi... 2016-10-15, 3138🔥, 0💬

"mysql" Command Line Options in MySQL
What Are the "mysql" Command Line Options in MySQL? "mysql" offers a big list of command line options. Here are some commonly used options: "-?" - Displays a help message on how to use "mysql" and terminates the program. "-u userName" - Specifies a user name for the server to authenticate when conne... 2018-04-28, 3137🔥, 0💬

Show All User Accounts in Oracle
How To List All User Accounts in Oracle? User accounts can be accessed through a system view called ALL_USERS. A simple SELECT statement can be used to get a list of all user accounts. Try the following script: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter Connected. SQL&gt; ... 2019-07-21, 3136🔥, 0💬

Rename an Existing Column in a Table in MySQL
How To Rename an Existing Column in a Table in MySQL? If you have an existing column in a table and you want to change the column name, you can use the "ALTER TABLE ... CHANGE" statement. This statement allows you to change the name of a column, and its definition. The tutorial script below gives yo... 2018-03-04, 3136🔥, 0💬

Introduction to Oracle SQL Developer
Where to find answers to frequently asked questions on Introduction to Oracle SQL Developer? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Introduction to Oracle SQL Developer: This FAQ can also be used as learning tutorials on SQL statement exe... 2019-02-18, 3135🔥, 0💬

Connect MS Access to Oracle Servers in Oracle
How To Connect MS Access to Oracle Servers in Oracle? Once you got a DSN defined in the ODBC manager that connects to an Oracle server, you can connect a normal MS Access document to the Oracle server, and link an Access table to Oracle table. The tutorial below gives you a good example: Start MS Ac... 2016-10-15, 3135🔥, 0💬

odbc_errormsg() - Retrieving ODBC Error Messages
How To Retrieve Error Messages using odbc_errormsg()? When you call odbc_exec() to execute a SQL statement, and the execution failed on the SQL Server, you can use odbc_error() and odbc_errormsg() to retrieve the error code and error messages. The tutorial script below shows you a good example: &... 2024-06-30, 3134🔥, 0💬

PS_CURRENT_THREAD_ID() - PS Thread ID of Current Connect
How to obtain the performance schema thread id of the current connection using the PS_CURRENT_THREAD_ID() function? PS_CURRENT_THREAD_ID() is a MySQL built-in function that returns the performance schema thread id of the current connection. For example: SELECT PS_CURRENT_THREAD_ID(); -- +-----------... 2025-02-16, 3132🔥, 0💬

Understanding SQL DML Statements for Oracle
Where to find answers to frequently asked questions on SQL DML Statements for Oracle. I want insert and delete data in tables. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on SQL DML Statements for Oracle. Clear answers are provided with tutorial ... 2020-02-07, 3128🔥, 0💬

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General MySQL Oracle SQL Server