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What Is a Subquery
What Is a Subquery? - MySQL FAQs - SQL SELECT Statements with JOIN and Subqueries A subquery is a SELECT statement used as part of the selection criteria of the main SELECT statement. The subquery specified in the WHERE clause will be evaluated repeated on each row of the selection base table. The o...
2007-05-11, 4990👍, 0💬

What Happens If the UPDATE Subquery Returns Multiple Rows
What Happens If the UPDATE Subquery Returns Multiple Rows? - MySQL FAQs - Understanding SQL INSERT, UPDATE and DELETE Statements 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, My...
2007-05-11, 4987👍, 0💬

How To Connect to a MySQL Sever with Default Port Number
How To Connect to a MySQL Sever with Default Port Number? - MySQL FAQs - PHP Connections and Query Execution If you want to connect a MySQL server with default port number, you can use the "mysql_connect($server)" function, where $server is the host name or IP address where the MySQL server is runni...
2007-05-10, 4983👍, 0💬

How To Fix the INSERT Command Denied Error
How To Fix the INSERT Command Denied Error? - MySQL FAQs - Managing Tables and Running Queries with PHP Scripts The reason for getting the "1142: INSERT command denied" error is that your user accound does not have the INSERT privilege on the table or database. To resolve this error, you need to ask...
2007-05-10, 4978👍, 0💬

How To Write Date and Time Literals
How To Write Date and Time Literals? - MySQL FAQs - Introduction to SQL Date and Time Handling MySQL offers a number of formats for you to use to enter date and time literals: ANSI standard format: "YYYY-MM-DD HH:MM:SS". Non-standard limiters. Like: "YYYY/MM/DD HH^MM^SS" or "YYYY.MM.DD HH-MM-SS". No...
2007-05-11, 4962👍, 0💬

What Happens If You Do Not Have Privileges to Create Database
What Happens If You Do Not Have Privileges to Create Database? - MySQL FAQs - PHP Connections and Query Execution If your MySQL server is provided by your Internet service company, your user account will most likely have no privilege to create new databases on the server. In that case, your CREATE D...
2007-05-10, 4958👍, 0💬

How To Connect to MySQL Severs with User Accounts
How To Connect to MySQL Severs with User Accounts? - MySQL FAQs - PHP Connections and Query Execution If you want to connect a MySQL server with user account name and password, you need to call mysql_connect() with more parameters like this: $con = mysql_connect($server, $username, $password); If yo...
2007-05-10, 4956👍, 0💬

How To Include Comments in SQL Statements
How To Include Comments in SQL Statements? - MySQL FAQs - Introduction to SQL Basics If you want to include comments in a SQL statement, you can first enter "--", then enter your comment until the end of the line. The tutorial exercise below shows you some good examples: SELECT 'Hello world!' FROM D...
2007-05-11, 4955👍, 0💬

How To Grant User Privileges at the Database Level
How To Grant User Privileges at the Database Level? - MySQL FAQs - Managing User Accounts and Access Privileges If you want to grant a user privilege at the database level, you can use the "GRANT privilegeName ON databaseName.* TO userName" command. The argument "databasename.*" in the command stand...
2007-05-10, 4950👍, 0💬

What Is "mysqldump"
What Is "mysqldump"? - MySQL FAQs - Administrator Tools for Managing MySQL Server "mysqldump" - A command-line interface for administrators or end users to export data from the server to files. Here are some sample commands supported by "mysqldump": "mysqldump databaseName tableName" - Dumps the spe...
2007-05-11, 4949👍, 0💬

How To View User Privileges
How To View User Privileges? - MySQL FAQs - Managing User Accounts and Access Privileges If a regular user wants to see his/her own granted privileges, he/she can use the "SHOW GRANTS" command. If the "root" user wants to see other user's granted privileges, he/she can use the "SHOW GRANTS FOR userN...
2007-05-10, 4944👍, 0💬

What Happens If NULL Values Are Involved in Expressions
What Happens If NULL Values Are Involved in Expressions? - MySQL FAQs - Introduction to SQL Basics If NULL values are used in expressions, the resulting values will be NULL values. In other words: Arithmetic expressions with NULL values result NULL values. Comparison expressions with NULL values res...
2007-05-11, 4939👍, 0💬

What Are Numeric Data Types
What Are Numeric Data Types? - MySQL FAQs - Introduction to SQL Basics MySQL supports the following numeric data types: BIT(n) - An integer with n bits. BOOL same as BOOLEAN - Boolean values stored in 1 bit. TINYINT - A small integer stored in 1 byte. SMALLINT - A small integer stored in 2 bytes. ME...
2007-05-11, 4939👍, 0💬

How To Perform Key Word Search in Tables
How To Perform Key Word Search in Tables? - PHP Script Tips - Working with MySQL Database The simplest way to perform key word search is to use the SELECT statement with a LIKE operator in the WHERE clause. The LIKE operator allows you to match a text field with a keyword pattern specified as '%keyw...
2007-04-19, 4939👍, 0💬

How To Write a Query with a Full Outer Join
How To Write a Query with a Full Outer Join? - MySQL FAQs - SQL SELECT Statements with JOIN and Subqueries There is no way to do full outer join in MySQL. It does not support this feature at the current MySQL release.
2007-05-11, 4936👍, 0💬

How To Use Regular Expression in Pattern Match Conditions
How To Use Regular Expression in Pattern Match Conditions? - MySQL FAQs - Introduction to SQL Basics If you have a pattern that is too complex for LIKE to handle, you can use the regular expression pattern condition: REGEXP. The following tutorial exercise provides you some good examples: SELECT 'FY...
2007-05-11, 4932👍, 0💬

What Is MySQL
What Is MySQL? - MySQL FAQs - Downloading and Installing MySQL on Windows MySQL is an open source database management system developed by MySQL AB, http://www.mysql.com. MySQL has the following main features: Works on many different platforms. APIs for C, C++, Eiffel, Java, Perl, PHP, Python, Ruby, ...
2007-05-10, 4929👍, 0💬

What Is a Data Lock
What Is a Data Lock? - MySQL FAQs - Transaction Management: Commit or Rollback MySQL uses two types of data locks at two levels to provide you the transaction isolation level you need: Share Lock at Row Level (S) - A data row is locked by a transaction for reading. Exclusive Lock at Row Level (X) - ...
2007-05-09, 4925👍, 0💬

How To Dump a Table to a File with "mysqldump"
How To Dump a Table to a File with "mysqldump"? - MySQL FAQs - Administrator Tools for Managing MySQL Server If you want to dump all rows in a table from the server to a file, you can use "mysqldump" with the "-f fileName" option as show in the following tutorial exercise: >cd \mysql\bin >mysqldump ...
2007-05-11, 4924👍, 0💬

How To Run MySQL Server on a Different Port
How To Run MySQL Server on a Different Port? - MySQL FAQs - Server Daemon mysqld Administration By default, MySQL will listen at port number 3306 for any client connections. But you can change this by starting the server with "--port=portNumber" option. The tutorial exercise shows you how to start t...
2007-05-11, 4921👍, 0💬

What Are the Differences between CHAR and VARCHAR
What Are the Differences between CHAR and VARCHAR? - MySQL FAQs - Introduction to SQL Basics CHAR and VARCHAR are both ASCII character data types by default. But they have the following major differences: CHAR stores values in fixed lengths. Values are padded with space characters to match the speci...
2007-05-11, 4912👍, 0💬

How To Turn on Query Logs
How To Turn on Query Logs? - MySQL FAQs - Server Daemon mysqld Administration If you want MySQL to write query logs to a file, you can use the "--log=fileName" option at the "mysqld" command line. The tutorial exercise below shows you a good example on how to use this option and view the query log f...
2007-05-11, 4910👍, 0💬

How To Turn on Error Logs
How To Turn on Error Logs? - MySQL FAQs - Server Daemon mysqld Administration If you want MySQL to write critical errors into a log file, you can use the "--log-error=fileName" option at the "mysqld" command line. The tutorial exercise below shows you a good example on how to use this option: >cd \m...
2007-05-11, 4907👍, 0💬

What Are Date and Time Intervals
What Are Date and Time Intervals? - MySQL FAQs - Introduction to SQL Date and Time Handling 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 expressio...
2007-05-11, 4906👍, 0💬

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