General MySQL Oracle SQL Server

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Adding Address Records into AdventureWorksLT in SQL Server
How to add an address record into AdventureWorksLT in SQL Server? To find out if we can add data into AdventureWorksLT or not, you can try to add an address record into the "SalesLT.Address" in AdventureWorksLT: USE AdventureWorksLT GO INSERT SalesLT.Address (AddressLine1, City, StateProvince, Count... 2016-12-02, 2571🔥, 0💬

VERSION() - Version Number of MySQL Server
How to obtain the version number of the MySQL server using the VERSION() function? VERSION() is a MySQL built-in function that returns the version number of the MySQL server. For example: SELECT VERSION(); -- +-----------+ -- | VERSION() | -- +-----------+ -- | 8.0.17 | -- +-----------+ SELECT @@ver... 2025-01-07, 2570🔥, 0💬

Extract Unit Values from a Date and Time in MySQL
How To Extract a Unit Value from a Date and Time in MySQL? If you want to extract a specific date or time unit value out of a date or a time, you can use the EXTRACT(unit FROM expression) function. The tutorial exercise below gives you some good examples: ELECT EXTRACT(DAY FROM NOW()) FROM DUAL; 28 ... 2018-03-13, 2569🔥, 0💬

Define Anonymous Procedures without Variables in Oracle
How To Define an Anonymous Procedure without Variables in Oracle? Anonymous procedure is a procedure without any name. If you don't have any variables to declare, you can define an anonymous procedure by using the BEGIN keyword directly in SQL*Plus as shown in the following tutorial script: SQL&... 2018-01-27, 2568🔥, 0💬

Location of Database Files in SQL Server
Where is my database stored on the hard disk in SQL Server? If a database is created with simple CREATE DATABASE statement, the server will create two database files on the hard disk to store data and configuration information about that data bases: database_name.mdf - SQL Server Database Primary Da... 2016-11-24, 2567🔥, 0💬

Rename a Column in an Existing Table in Oracle
How To Rename a Column in an Existing Table in Oracle? Let's say you have an existing with an existing column, but you don't like the name of that column, can you rename that column name? The answer is yes. You can use the ALTER TABLE ... RENAME COLUMN statement to do this. See the following SQL scr... 2019-05-25, 2566🔥, 0💬

Add a New Column to an Existing Table in Oracle
How To Add a New Column to an Existing Table in Oracle? If you have an existing table with existing data rows, and want to add a new column to that table, you can use the ALTER TABLE ... ADD statement to do this. Here is an example script: SQL&gt; connect HR/fyicenter Connected. SQL&gt; CREA... 2019-05-25, 2566🔥, 0💬

Oracle Tablespace - Unit of Logical Storage in Oracle
What Is an Oracle Tablespace in Oracle? An Oracle tablespace is a big unit of logical storage in an Oracle database. It is managed and used by the Oracle server to store structures data objects, like tables and indexes.   ⇒ Oracle Data File - Unit of Physical Storage in Oracle ⇐ Managing Oracle Tab... 2019-04-17, 2566🔥, 0💬

Date and Time Intervals in MySQL
What Are Date and Time Intervals in MySQL? A date and time interval is special value to be used to increment or decrement a date or a time at a given date or time unit. A data and time interval should be expression in the format of "INTERVAL expression unit", where "unit" and "expression" should fol... 2017-12-26, 2566🔥, 0💬

Introduction to SQL Basics in MySQL
Where to find answers to frequently asked questions on Introduction to SQL Basics in MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Introduction to SQL Basics in MySQL. Clear answers are provided with tutorial exercises on character and nu... 2018-04-21, 2564🔥, 0💬

Entering Binary Numbers in MySQL
How To Enter Binary Numbers in SQL Statements in MySQL? If you want to enter character strings or numeric values as binary numbers, you can quote binary numbers with single quotes and a prefix of (B), or just prefix binary numbers with (0b). Binary numbers will be automatically converted into charac... 2018-03-31, 2563🔥, 0💬

odbc_exec() - Executing SQL Statements
How To Execute a SQL Statement using odbc_exec()? Once you have created an ODBC connection object, you can use the odbc_exec() function to send a SQL statement to the SQL Server linked to the connection object for execution. Here is a simple PHP script that creates a new schema and a new table: &... 2024-06-30, 2561🔥, 0💬

Use "IF" Statements with Multiple Conditions in Oracle
How To Use "IF" Statements on Multiple Conditions in Oracle? If you have multiple blocks of codes to be executed based on different conditions, you can use the "IF ... ELSIF" statement. Here is a sample script on IF statements: DECLARE day VARCHAR2; BEGIN day := 'SUNDAY'; IF day = 'THURSDAY' THEN DB... 2018-07-13, 2561🔥, 0💬

Data Pump Import Utility in Oracle
What Is the Data Pump Import Utility in Oracle? Oracle Data Pump Import utility is a standalone programs that allows you to import data objects from an Oracle dump file set into Oracle database. Oracle dump file set is written in a proprietary binary format by the Data Pump Export utility. Import ca... 2016-10-15, 2560🔥, 0💬

Add a New Column to an Existing Table in MySQL
How To Add a New Column to an Existing Table in MySQL? If you have an existing table with existing data rows, and want to add a new column to that table, you can use the "ALTER TABLE ... ADD COLUMN" statement. The tutorial script below shows you a good example: mysql&gt; ALTER TABLE tip ADD COLU... 2018-03-04, 2559🔥, 0💬

Use Values from Other Tables in UPDATE in Oracle
How To Use Values from Other Tables in UPDATE Statements in Oracle? If you want to update values in one with values from another table, you can use a subquery in the SET clause. The subquery should return only one row for each row in the update table that matches the WHERE clause. The tutorial exerc... 2020-01-21, 2558🔥, 0💬

Different Types of PL/SQL Code Blocks in Oracle
What Are the Different Types of PL/SQL Code Blocks in Oracle? There are 3 types of PL/SQL code blocks: Anonymous Block - A block of codes with no name. It may contain a declaration part, an execution part, and exception handlers. Stored Program Unit - A block of codes with a name. It is similar to a... 2018-11-29, 2558🔥, 0💬

Relation between Database and Tablespaces in Oracle
How a Database Is Related to Tablespaces in Oracle? A database's data is collectively stored in the datafiles that constitute each tablespace of the database. For example, the simplest Oracle database would have one tablespace and one datafile. Another database can have three tablespaces, each consi... 2019-01-20, 2557🔥, 0💬

List Table Names with "mysqlshow" Command in MySQL
How To Show Table Names with "mysqlshow" in MySQL? If you want to show table names with "mysqlshow", you need to specify a database name. The followings tutorial exercise shows you how to get all table names that match a pattern: If you want analyze tables with "mysqlcheck", you need to use the "--a... 2018-05-19, 2556🔥, 0💬

What Are NULL Values in SQL Server
What Are NULL Values in SQL Server Transact-SQL? A NULL value is a special value that represents an unknown value. SQL Server supports NULL values with the following features: All data types used for table columns support NULL values. In another word, NULL values can be stored in database tables. In... 2017-02-05, 2556🔥, 0💬

"CREATE LOGIN" - Creating a New Login Name in SQL Server
How To Create a New Login Name in SQL Server in SQL Server? In previous tutorials, it is assumed that you use the "sa" (System Administrator) login name to connect to your SQL Server. But that is not what a normal developer uses to connect to the server, since "sa" has the ALL permissions granted. Y... 2016-10-20, 2556🔥, 0💬

Privilege Needed to Connect to Oracle Server in Oracle
What Privilege Is Needed for a User to Connect to Oracle Server in Oracle? Oracle deny connection to users who has no CREATE SESSION privilege. Try the following tutorial exercise, you will find out how Oracle denies connection: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter SQL&a... 2019-07-09, 2555🔥, 0💬

Using Multiple Columns in GROUP BY in MySQL
Can Multiple Columns Be Used in GROUP BY in MySQL? If you want to break your output into smaller groups, if you specify multiple column names or expressions in the GROUP BY clause. Output in each group must satisfy a specific combination of the expressions listed in the GROUP BY clause. The more col... 2017-10-16, 2555🔥, 0💬

Read Consistency Support in MySQL in MySQL
How Does MySQL Handle Read Consistency in MySQL? Read consistency is a concept that describes how consistent the output will be on two subsequent read operations. A read operation is usually a stand alone SELECT statement or a SELECT subquery in a parent statement. A database server can support up t... 2017-08-03, 2555🔥, 0💬

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General MySQL Oracle SQL Server