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What Are DML Statements in MySQL
What Are DML Statements in MySQL? 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 r...
2018-01-24, 572👍, 0💬

Insert Multiple Rows with 1 INSERT Statement in MySQL
How To Insert Multiple Rows with One INSERT Statement in MySQL? If you want to insert multiple rows with a single INSERT statement, you can use a subquery instead of the VALUES clause. Rows returned from the subquery will be inserted the target table. The following tutorial exercise gives a good exa...
2018-01-16, 572👍, 0💬

Types of Execution Flow Control Statements in Oracle
What Are the Execution Control Statements in Oracle? PL/SQL supports three groups of execution control statements: IF Statements - Conditionally executes a block of statements. CASE Statements - Selectively executes a block of statements. LOOP Statements - Repeatedly executes a block of statements. ...
2018-11-17, 571👍, 0💬

Creating a New Database in MySQL
How To Create a New Database in MySQL? A database in a MySQL server is a logical container used to group tables and other data objects together as a unit. If you are the administrator of the server, you can create a new databases using the CREATE DATABASE statements with MySQL client interface progr...
2017-11-11, 571👍, 0💬

What Are Views in SQL Server
What Are Views in SQL Server? A view is a database object that represents the data in one or more tables in the same structure as a separate table. Here are some basic rules about views: Tables store real data. Views do not store real data. Views must have underlying tables to provide data. Each vie...
2016-11-08, 571👍, 0💬

"DELETED" - Old Record of an DML Event Instance in SQL Server
How To Access the Deleted Record of an Event in SQL Server? When a DML event occurs, SQL Server will prepare a temporary table called "DELETED", which contains the old record of the affected row, which is: A copy of the deleted row for a DELETE statement. A copy of the row to be updated for an UPDAT...
2016-10-24, 571👍, 0💬

Ways to Join Two Tables in a Single Query in Oracle
How To Join Two Tables in a Single Query in Oracle? Two tables can be joined together in a query in 4 ways: Inner Join: Returns only rows from both tables that satisfy the join condition. Left Outer Join: Returns rows from both tables that satisfy the join condition, and the rest of rows from the fi...
2019-10-27, 570👍, 0💬

Work with Data Objects Interactively in Oracle
How To Work with Data Objects Interactively in Oracle? You can work with data objects through SQL statements in statement area. If you want to work with data objects interactively, you should use the object browser. The following tutorial steps help you to browse data objects: Click the Connetions t...
2018-10-08, 570👍, 0💬

Close MySQL Connection Objects in MySQL
How To Close MySQL Connection Objects in MySQL? MySQL connection objects created with mysql_connect() calls should be closed as soon as you have finished all of your database access needs by calling mysql_close($con) function. This will reduce the consumption of connection resources on your MySQL se...
2017-11-11, 570👍, 0💬

"DROP DATABASE" - Deleting Databases in SQL Server
How to delete a database in SQL Server? If you created a database incorrectly, or you have a database that is not needed any more, you can delete it with the "DROP DATABASE" statement with this syntax: DROP DATABASE database_name For example, execute this statement: DROP DATABASE FyiCenterData GO Th...
2016-11-24, 569👍, 0💬

"CREATE USER" - Creating a User Name in a Database in SQL Server
How To Create a User Name in a Database in SQL Server? User names are security principals at the database level. If you want to allow a login name to access a specific database, you need to create a user name in that database and link it to the login name. Creating a user name can be done by using t...
2016-10-19, 569👍, 0💬

Installing SQL Server 2005 Express Edition in SQL Server
How to install SQL Server 2005 Express Edition in SQL Server? Once you have downloaded SQL Server 2005 Express Edition, you should follow this tutorial to install it on your system: 1. Double click SQLEXPR.EXE. The setup window shows up. 2. Click Next to let the setup program to unpack all files fro...
2016-12-08, 568👍, 0💬

ONLINE/OFFLINE - Database States in SQL Server
What are database states in SQL Server? A database is always in one specific state. For example, these states include ONLINE, OFFLINE, or SUSPECT. To verify the current state of a database, select the state_desc column in the sys.databases catalog view. The following table defines the database state...
2016-11-20, 568👍, 0💬

Syntaxes of Creating Table-Valued Functions in SQL Server
How Many Ways to Create Table-Valued Functions in SQL Server Transact-SQL? SQL Server supports two syntaxes of creating table-valued functions: 1. Inline Table-valued Functions - A table-valued function created with a single SELECT statement: CREATE FUNCTION function_name( @parameter_1 data_type, @p...
2016-12-18, 567👍, 0💬

"INSERT" and "UPDATE" Statements - Inserting and Updating Data In Tables in SQL Server
How to insert and update data into a table with "INSERT" and "UPDATE" statements in SQL Server? This is the third tutorial of a quick lesson on creating database objects with Transact-SQL statements. This lesson shows you how to create a database, create a table in the database, and then access and ...
2016-12-02, 567👍, 0💬

Returning the Second 5 Rows from a Query in SQL Server
How To Return the Second 5 Rows in SQL Server? If you want to display query output in multiple pages with 5 rows per page, and the visitor wants to see the output for the second page, you need to display query output from row 6 to row 10. If you are using MySQL server, you can use the "LIMIT startRo...
2016-10-29, 567👍, 0💬

"mysqld" Command Line Options in MySQL
What Are the "mysqld" Command Line Options in MySQL? "mysqld" offers a big list of command line options. Here are some commonly used options: "--help" - Displays a short help message on how to use "mysqld". "--verbose --help" - Displays a long help messages on how to use "mysqld". "--console" - Spec...
2017-12-04, 566👍, 0💬

Drop an Existing View in Oracle
How To Drop an Existing View in Oracle? If you have an existing view, and you don't want it anymore, you can delete it by using the DROP VIEW statement as shown in the following script: DROP VIEW employee_department; View dropped.   ⇒Understanding SQL DDL Statements for Oracle ⇒⇒Oracle Database Tut...
2020-02-07, 565👍, 0💬

Rebuilding All Indexes on One Table in SQL Server
How To Rebuild All Indexes on a Single Table in SQL Server? If you have several indexes on a single table and want to rebuild all of them, you may use the "ALTER INDEX ALL ON table_name REBUILD" statement as shown in the tutorial exercise below: USE FyiCenterData; GO UPDATE fyi_links_indexed SET url...
2016-11-08, 565👍, 0💬

"FETCH" - Fetching the Next Row from a Cursor in SQL Server
How To Fetch the Next Row from a Cursor with a "FETCH" Statement in SQL Server Transact-SQL? When the result set is ready in a cursor, you can use a FETCH statement to retrieve one row from the result set in the same format as a SELECT statement. The FETCH statement has the following formats: FETCH ...
2016-10-17, 565👍, 0💬

Retrieving MySQL Server information in MySQL
How To Get Some Basic Information Back from MySQL Servers in MySQL? Once you got a MySQL server connection object successfully, you can use mysql_get_server() and mysql_get_host_info() to get some basic information from your MySQL server. The tutorial exercise below is a good example: &lt;?php $...
2017-11-11, 564👍, 0💬

Database in Use When Dropping a Database in SQL Server
Why I am getting this error when dropping a database in SQL Server? If you are trying to drop a database that is in use, you will get an error message like this: 'Cannot drop database "FyiCenterData" because it is currently in use.' Before dropping a database, you must stop all client sessions using...
2016-11-24, 564👍, 0💬

Sorting Query Output in Descending Order in SQL Server
How To Sort Query Output in Descending Order in SQL Server? If you want to sort a column in descending order, you can specify the DESC keyword in the ORDER BY clause. The following SELECT statement first sorts the "tag" in descending order, then sorts the "counts" in ascending order: SELECT tag, cou...
2016-10-26, 564👍, 0💬

Triggers with Multiple Affected Rows in SQL Server
What Happens to a Trigger with Multiple Affected Rows in SQL Server? If there is only one row affected by a DML statement, we know that the DML trigger will be executed once. But how many times the DML trigger will be executed if the DML statement resulted multiple affected rows? The answer is still...
2016-10-24, 564👍, 0💬

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